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Hack The Box

<div><h3 class="jobSectionHeader">Ready to embark on the quest of joining Hack The Box?</h3>
At the end of this thrilling journey, you'll become a proud member of Hack The Box, with the ultimate mission to help redefine cybersecurity expertise. Get ready for an exciting adventure into the world of cybersecurity!<h3 class="jobSectionHeader">
&#10024;The core mission of the Senior Django Engineer:</h3>
We are on the lookout for our next backend engineer in LetsDefend team. Let&rsquo;s Defend is a cutting-edge cybersecurity training company dedicated to empowering blue-team professionals by simulating a real Security Operations Center (SOC). It has a community of over 320,000 members across 150+ countries fosters peer learning and collaboration.
Hack The Box and LetsDefend join forces to create the world&rsquo;s largest collaborative cybersecurity platform with hands-on labs, SOC simulations, and a unified upskilling experience.
This role will focus on enhancing backend performance and scalability, strengthening code quality and reliability, and leading architectural direction across teams. The software engineer will play a key role in improving system efficiency, reducing issues, and fostering alignment with frontend, mobile, and DevOps counterparts. Additionally, they will own and deliver impactful backend features that support major product goals and contribute to the platform&rsquo;s long-term growth.
 Location &amp; Work Mode:<ul>
<li>
Options: Turkiye or Greece</li>
<li>Fully Remote - If only in Greece: When hiring in Greece, we&rsquo;re open to candidates from all locations. Those based within 55 km of our Athens office will follow a hybrid work model. For candidates located beyond that radius, a fully remote arrangement is available.</li>
</ul><h3 class="jobSectionHeader"> The fellowship you&rsquo;ll be joining:
</h3>
The new joiner will be part of a lean software engineering team composed of three members: one Senior Backend Developer, one Mid-Level Frontend Developer, and one Mobile Developer. In this role, they will collaborate closely not only with their immediate teammates, but also with key stakeholders across the organization, including the Content Engineering team, Sales team, Infrastructure, and the broader Engineering team, all of whom play a critical role in supporting the product and its customers. This position will report directly to the Sr. Director of Engineering.<ul><li>&#65039; Technology tools &amp; weapons you&rsquo;ll be using:</li></ul><ul>
<li>Django Framework (Python language)</li>
<li>Docker</li>
<li>Apache Kafka</li>
<li>Redis</li>
<li>Git</li>
</ul><h3 class="jobSectionHeader"> Interesting resources you should check:</h3><ul>
<li>Take a look at LetsDefend Website</li>
<li>Hack The Box + LetsDefend: Shaping the future of community-led cyber readiness</li>
</ul><h3 class="jobSectionHeader"> The adventures that await you after becoming Senior Django Engineer:
</h3><ul><li>Optimize backend performance by improving API responsiveness, refining database queries, and enhancing caching strategies.</li>
<li>Design scalable backend architectures and influence long-term technical direction across multiple products and services.</li>
<li>Implement high-quality, maintainable code with strong test coverage and adherence to best practices.</li>
<li>Refactor legacy components into clean, modular, and future-ready services that accelerate development.</li>
<li>Collaborate closely with frontend, mobile, DevOps, and product teams to ensure smooth execution of cross-functional projects.</li>
<li>Lead technical discussions, produce clear design documents, and guide the team on architectural patterns.</li>
<li>Troubleshoot production issues rapidly and improve system reliability through monitoring, logging, and error reduction.</li>
<li>Deliver high-impact backend features that directly support product growth, user engagement, and business goals</li>
</ul><h3 class="jobSectionHeader"> Skills, knowledge, and experience points required to unlock the role of Senior Django Engineer:</h3><ul>
<li>Expert-level proficiency in Django &amp; Django REST Framework, including ORM optimization, class-based views, and advanced API design.</li>
<li>Hands-on experience with asynchronous task processing, ideally Celery + Redis/RabbitMQ, and deep understanding of reliability patterns.</li>
<li>Ability to design scalable backend architectures, including caching layers, service boundaries, and performance bottleneck prevention.</li>
<li>Solid understanding of backend security practices, including authentication, authorization, rate-limiting, and secure data handling.</li>
<li>Proven track record of owning and delivering complex backend features, including writing technical designs and mentoring other engineers.</li>
<li>Good knowledge of English language (verbal and written)</li>
</ul>
Bonus points:<ul>
<li>
Experience with AWS or other cloud platforms</li>
<li>Knowledge of Docker or containerization</li>
<li>Exposure to event streaming technologies such as Apache Kafka</li>
</ul><h3 class="jobSectionHeader">&#65039; What your adventure will have in store:</h3>
<ul><li>You'll have the exhilarating opportunity to contribute to a product that is highly appreciated by users and the cybersecurity community at large.</li>
<li> You'll experience a highly supportive and caring environment, fostering growth, flexibility, and autonomy.</li>
<li> You'll embark on an exciting journey of continuous learning and problem-solving, leveling up as our organization grows.</li>
 Most importantly, you'll have a blast at HTB<li> because fun is an essential ingredient in our recipe for success! Just wait until you see our global meet-ups!</li>
</ul><h3 class="jobSectionHeader">The gems you&rsquo;ll be enjoying as a Senior Django Engineer:</h3><ul>
<li>25 annual leave days</li>
<li>Paid paternity leave</li>
<li>Dedicated budget for training and professional development, participation in conferences</li>
Full access to the Hack The Box lab offerings; so you can learn how to hack
<li>State-of-the-art equipment (mac, iPhone, and mobile plan)</li>
</ul>
Our benefits package is designed to provide strong support to our team, but it may vary depending on location and type of employment (e.g., UK, Greece, or engagement through an Employer
<h3 class="jobSectionHeader">&#65039; The Quest of Becoming Senior Django Engineer:</h3><ul>
<li>Level 1: To complete level one&rsquo;s objective, submit your application.</li>
<li>Level 2: Meet the Talent Acquisition team. Level&rsquo;s objective: highlight your past achievements, ambitions, and values.</li>
<li>Level 3: Meet the hiring team. Level&rsquo;s objective: connect with the hiring team and share with them your achievements.</li>
<li>Level 4: Meet the hiring team, once again, to explore your leadership mindset and values alignment with HTB.</li>
Level 5: Congratulations! Not many reach this level <li>. Level&rsquo;s objective: have a constructive, final conversation with senior leadership to explore the role and your future at HTB.</li>
<li>Level 6: You've officially received an offer from HTB! To complete the last level and the Quest, all you need to do is accept the offer.</li>
Quest complete. Congratulations, you&rsquo;re officially one of us Your next quest: complete the onboarding. 
<li>
</li>
</ul>Hack Your Career, Today. Join us in this epic adventure of cybersecurity at Hack The Box!<h3 class="jobSectionHeader">
ABOUT HACK THE BOX</h3>
Hack The Box is the leading cybersecurity readiness and upskilling platform, trusted by enterprises, government organizations, and MSSPs to build cyber resilience at scale. Through AI-enhanced intelligence, gamified labs, live-fire simulations, and the power of one of the world&rsquo;s largest cybersecurity communities, Hack The Box helps teams master offensive and defensive skills in real-world scenarios. Founded in 2017, Hack The Box has grown its global community of over 4 million members, helping organizations validate resilience, mitigate breach risk, and develop cyber talent. For more information, visit hackthebox.com
Rapidly growing its international footprint and reach, Hack The Box is headquartered in the UK, with additional offices in the US, Australia, and Greece.
 News &amp; Resources:<ul>
<li>
Get the most important updates on HTB&rsquo;s latest year!</li>
<li>We&rsquo;re incredibly proud to share that our headquarters in the UK, along with our entities in Greece and the US, have been certified as a Great Place to Work for three consecutive years (2023 - 2025).</li>
<li>In addition, our Greek entity has been recognized among the Best Workplaces in Greece (4th, 2nd, 3rd) and Europe (7th, 10th, 73rd) during this period &mdash; a testament to our strong culture and commitment to creating an exceptional employee experience!</li>
</ul>
Take a sneak peek at how it is to be part of HTB and our 2023 Global Retreat. Get more insights about our HTB culture and employee experience by visiting the &ldquo;about us&rdquo; section of our site, our career site, and Glassdoor.
At Hack The Box, we are committed to fostering a diverse, inclusive, and equitable workplace. We believe that diversity enriches our performance, services, and the communities we serve. As such, we ensure that all job applications are considered solely based on merit, skills, and qualifications. We do not discriminate on grounds of race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. We are dedicated to providing a fair and respectful work environment that reflects our values.</div>

Senior Django Engineer

<div>
 
 
 Ready to embark on the quest of joining Hack The Box?
 
 
 
 At the end of this thrilling journey, you'll become a proud member of Hack The Box, with the ultimate mission to help redefine cybersecurity expertise. Get ready for an exciting adventure into the world of cybersecurity! 🚀🔒💻
 
 
 
 ✨The core mission of the Senior Django Engineer:
 
 
 
 We are on the lookout for our next backend engineer in LetsDefend team. Let&rsquo;s Defend is a cutting-edge cybersecurity training company dedicated to empowering blue-team professionals by simulating a real Security Operations Center (SOC). It has a community of over 320,000 members across 150+ countries fosters peer learning and collaboration.
 
 
 Hack The Box and LetsDefend join forces to create the world&rsquo;s largest collaborative cybersecurity platform with hands-on labs, SOC simulations, and a unified upskilling experience.
 
 
 This role will focus on enhancing backend performance and scalability, strengthening code quality and reliability, and leading architectural direction across teams. The software engineer will play a key role in improving system efficiency, reducing issues, and fostering alignment with frontend, mobile, and DevOps counterparts. Additionally, they will own and deliver impactful backend features that support major product goals and contribute to the platform&rsquo;s long-term growth.
 
 
 
 🏢 Location &amp; Work Mode:
 
 
 <ul>
 <li>
 Options: Turkiye or Greece
 </li>
 <li>
 Fully Remote - If only in Greece: When hiring in Greece, we&rsquo;re open to candidates from all locations. Those based within 55 km of our Athens office will follow a hybrid work model. For candidates located beyond that radius, a fully remote arrangement is available.
 </li>
 </ul>
 
 
 
 
 🍺
 
 The fellowship you&rsquo;ll be joining:
 
 
 
 The new joiner will be part of a lean software engineering team composed of three members: one Senior Backend Developer, one Mid-Level Frontend Developer, and one Mobile Developer. In this role, they will collaborate closely not only with their immediate teammates, but also with key stakeholders across the organization, including the Content Engineering team, Sales team, Infrastructure, and the broader Engineering team, all of whom play a critical role in supporting the product and its customers. This position will report directly to the Sr. Director of Engineering.
 
 
 
 
 
 
 ⚔️ Technology tools &amp; weapons you&rsquo;ll be using:
 
 
 <ul>
 <li>
 Django Framework (Python language)
 </li>
 <li>
 Docker
 </li>
 <li>
 Apache Kafka
 </li>
 <li>
 Redis
 </li>
 <li>
 Git
 </li>
 </ul>
 
 
 
 
 
 📚 Interesting resources you should check:
 
 
 <ul>
 <li>
 Take a look at LetsDefend Website
 </li>
 <li>
 Hack The Box + LetsDefend: Shaping the future of community-led cyber readiness
 </li>
 </ul>
 
 
 
 
 🚀
 
 The adventures that await you after becoming Senior Django Engineer:
 
 
 <ul>
 <li>
 Optimize backend performance by improving API responsiveness, refining database queries, and enhancing caching strategies.
 </li>
 <li>
 Design scalable backend architectures and influence long-term technical direction across multiple products and services.
 </li>
 <li>
 Implement high-quality, maintainable code with strong test coverage and adherence to best practices.
 </li>
 <li>
 Refactor legacy components into clean, modular, and future-ready services that accelerate development.
 </li>
 <li>
 Collaborate closely with frontend, mobile, DevOps, and product teams to ensure smooth execution of cross-functional projects.
 </li>
 <li>
 Lead technical discussions, produce clear design documents, and guide the team on architectural patterns.
 </li>
 <li>
 Troubleshoot production issues rapidly and improve system reliability through monitoring, logging, and error reduction.
 </li>
 <li>
 Deliver high-impact backend features that directly support product growth, user engagement, and business goals
 </li>
 </ul>
 
 
 
 
 
 🏆 Skills, knowledge, and experience points required to unlock the role of Senior Django Engineer:
 
 
 <ul>
 <li>
 Expert-level proficiency in Django &amp; Django REST Framework, including ORM optimization, class-based views, and advanced API design.
 </li>
 <li>
 Hands-on experience with asynchronous task processing, ideally Celery + Redis/RabbitMQ, and deep understanding of reliability patterns.
 </li>
 <li>
 Ability to design scalable backend architectures, including caching layers, service boundaries, and performance bottleneck prevention.
 </li>
 <li>
 Solid understanding of backend security practices, including authentication, authorization, rate-limiting, and secure data handling.
 </li>
 <li>
 Proven track record of owning and delivering complex backend features, including writing technical designs and mentoring other engineers.
 </li>
 <li>
 Good knowledge of English language (verbal and written)
 </li>
 </ul>
 
 
 Bonus points:
 
 
 <ul>
 <li>
 Experience with AWS or other cloud platforms
 </li>
 <li>
 Knowledge of Docker or containerization
 </li>
 <li>
 Exposure to event streaming technologies such as Apache Kafka
 </li>
 </ul>
 
 
 
 
 
 🕹️ What your adventure will have in store:
 
 
 <ul>
 <li>
 🎯You'll have the exhilarating opportunity to contribute to a product that is highly appreciated by users and the cybersecurity community at large.
 </li>
 <li>
 🎯 You'll experience a highly supportive and caring environment, fostering growth, flexibility, and autonomy.
 </li>
 <li>
 🎯 You'll embark on an exciting journey of continuous learning and problem-solving, leveling up as our organization grows.
 </li>
 <li>
 🎯 Most importantly, you'll have a blast at HTB 🥳 because fun is an essential ingredient in our recipe for success! Just wait until you see our global meet-ups!
 </li>
 </ul>
 
 
 
 
 
 💰The gems you&rsquo;ll be enjoying as a Senior Django Engineer:
 
 
 <ul>
 <li>
 25 annual leave days
 </li>
 <li>
 Paid paternity leave
 </li>
 <li>
 Dedicated budget for training and professional development, participation in conferences
 </li>
 <li>
 Full access to the Hack The Box lab offerings; so you can learn how to hack 😉
 </li>
 <li>
 State-of-the-art equipment (mac, iPhone, and mobile plan)
 </li>
 </ul>
 
 
 Our benefits package is designed to provide strong support to our team, but it may vary depending on location and type of employment (e.g., UK, Greece, or engagement through an Employer of Record).
 
 
 
 
 
 
 
 🗺️ The Quest of Becoming Senior Django Engineer:
 
 
 <ul>
 <li>
 Level 1: To complete level one&rsquo;s objective, submit your application.
 </li>
 <li>
 Level 2: Meet the Talent Acquisition team. Level&rsquo;s objective: highlight your past achievements, ambitions, and values.
 </li>
 <li>
 Level 3: Meet the hiring team. Level&rsquo;s objective: connect with the hiring team and share with them your achievements.
 </li>
 <li>
 Level 4: Meet the hiring team, once again, to explore your leadership mindset and values alignment with HTB.
 </li>
 <li>
 Level 5: Congratulations! Not many reach this level 💪. Level&rsquo;s objective: have a constructive, final conversation with senior leadership to explore the role and your future at HTB.
 </li>
 <li>
 Level 6: You've officially received an offer from HTB! To complete the last level and the Quest, all you need to do is accept the offer.
 </li>
 <li>
 Quest complete. Congratulations, you&rsquo;re officially one of us 🥳🎉🎇Your next quest: complete the onboarding.
 </li>
 </ul>
 
 
 Hack Your Career, Today. Join us in this epic adventure of cybersecurity at Hack The Box! 🚀🔒💻
 
 
 
 
 
 
 
 ABOUT HACK THE BOX
 
 
 
 Hack The Box is the leading cybersecurity readiness and upskilling platform, trusted by enterprises, government organizations, and MSSPs to build cyber resilience at scale. Through AI-enhanced intelligence, gamified labs, live-fire simulations, and the power of one of the world&rsquo;s largest cybersecurity communities, Hack The Box helps teams master offensive and defensive skills in real-world scenarios. Founded in 2017, Hack The Box has grown its global community of over 4 million members, helping organizations validate resilience, mitigate breach risk, and develop cyber talent. For more information, visit hackthebox.com
 
 
 Rapidly growing its international footprint and reach, Hack The Box is headquartered in the UK, with additional offices in the US, Australia, and Greece.
 
 
 
 🚨 News &amp; Resources:
 
 
 <ul>
 <li>
 Get the most important updates on HTB&rsquo;s latest year!
 </li>
 <li>
 We&rsquo;re incredibly proud to share that our headquarters in the UK, along with our entities in Greece and the US, have been certified as a Great Place to Work for three consecutive years (2023 - 2025).
 </li>
 <li>
 In addition, our Greek entity has been recognized among the Best Workplaces in Greece (4th, 2nd, 3rd) and Europe (7th, 10th, 73rd) during this period &mdash; a testament to our strong culture and commitment to creating an exceptional employee experience!
 </li>
 </ul>
 
 
 
 
 Take a sneak peek at how it is to be part of HTB and our 2023 Global Retreat. Get more insights about our HTB culture and employee experience by visiting the &ldquo;about us&rdquo; section of our site, our career site, and Glassdoor.
 
 
 
 
 
 
 At Hack The Box, we are committed to fostering a diverse, inclusive, and equitable workplace. We believe that diversity enriches our performance, services, and the communities we serve. As such, we ensure that all job applications are considered solely based on merit, skills, and qualifications. We do not discriminate on grounds of race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. We are dedicated to providing a fair and respectful work environment that reflects our values.
 
 
</div>

<div>
 
 Ready to embark on the quest of joining Hack The Box?
 
 
 
 At the end of this thrilling journey, you'll become a proud member of Hack The Box, with the ultimate mission to help redefine cybersecurity expertise. Get ready for an exciting adventure into the world of cybersecurity! 🚀🔒💻
 
 
 
 
 ✨The core mission of the Senior Django Engineer:
 
 
 
 
 We are on the lookout for our next backend engineer in LetsDefend team. Let's Defend is a cutting-edge cybersecurity training company dedicated to empowering blue-team professionals by simulating a real Security Operations Center (SOC). It has a community of over 320,000 members across 150+ countries fosters peer learning and collaboration.
 
 
 Hack The Box and LetsDefend join forces to create the world's largest collaborative cybersecurity platform with hands-on labs, SOC simulations, and a unified upskilling experience.
 
 
 This role will focus on enhancing backend performance and scalability, strengthening code quality and reliability, and leading architectural direction across teams. The software engineer will play a key role in improving system efficiency, reducing issues, and fostering alignment with frontend, mobile, and DevOps counterparts. Additionally, they will own and deliver impactful backend features that support major product goals and contribute to the platform's long-term growth.
 
 
 
 🏢 Location &amp; Work Mode:
 
 
 
 <ul>
 <li>
 Options: Turkiye or Greece
 </li>
 <li>
 Fully Remote - If only in Greece: When hiring in Greece, we're open to candidates from all locations. Those based within 55 km of our Athens office will follow a hybrid work model. For candidates located beyond that radius, a fully remote arrangement is available
 
 
 </li>
 </ul>
 
 🍺
 
 The fellowship you'll be joining:
 
 
 
 
 The new joiner will be part of a lean software engineering team composed of three members: one Senior Backend Developer, one Mid-Level Frontend Developer, and one Mobile Developer. In this role, they will collaborate closely not only with their immediate teammates, but also with key stakeholders across the organization, including the Content Engineering team, Sales team, Infrastructure, and the broader Engineering team, all of whom play a critical role in supporting the product and its customers. This position will report directly to the Sr. Director of Engineering.
 
 
 
 
 ⚔️ Technology tools &amp; weapons you'll be using:
 
 
 
 
 <ul>
 <li>
 Django Framework (Python language)
 </li>
 <li>
 Docker
 </li>
 <li>
 Apache Kafka
 </li>
 <li>
 Redis
 </li>
 <li>
 Git
 
 
 </li>
 </ul>
 
 
 📚 Interesting resources you should check:
 
 
 
 
 <ul>
 <li>
 Take a look at LetsDefend Website
 </li>
 <li>
 Hack The Box + LetsDefend: Shaping the future of community-led cyber readiness
 
 
 </li>
 </ul>
 
 🚀
 
 The adventures that await you after becoming Senior Django Engineer:
 
 
 
 
 <ul>
 <li>
 Optimize backend performance by improving API responsiveness, refining database queries, and enhancing caching strategies
 </li>
 <li>
 Design scalable backend architectures and influence long-term technical direction across multiple products and services
 </li>
 <li>
 Implement high-quality, maintainable code with strong test coverage and adherence to best practices
 </li>
 <li>
 Refactor legacy components into clean, modular, and future-ready services that accelerate development
 </li>
 <li>
 Collaborate closely with frontend, mobile, DevOps, and product teams to ensure smooth execution of cross-functional projects
 </li>
 <li>
 Lead technical discussions, produce clear design documents, and guide the team on architectural patterns
 </li>
 <li>
 Troubleshoot production issues rapidly and improve system reliability through monitoring, logging, and error reduction
 </li>
 <li>
 Deliver high-impact backend features that directly support product growth, user engagement, and business goals
 
 
 </li>
 </ul>
 
 
 🏆 Skills, knowledge, and experience points required to unlock the role of Senior Django Engineer:
 
 
 
 
 <ul>
 <li>
 Expert-level proficiency in Django &amp; Django REST Framework, including ORM optimization, class-based views, and advanced API design
 </li>
 <li>
 Hands-on experience with asynchronous task processing, ideally Celery + Redis/RabbitMQ, and deep understanding of reliability patterns
 </li>
 <li>
 Ability to design scalable backend architectures, including caching layers, service boundaries, and performance bottleneck prevention
 </li>
 <li>
 Solid understanding of backend security practices, including authentication, authorization, rate-limiting, and secure data handling
 </li>
 <li>
 Proven track record of owning and delivering complex backend features, including writing technical designs and mentoring other engineers
 </li>
 <li>
 Good knowledge of English language (verbal and written)
 
 
 </li>
 </ul>
 Bonus points:
 
 
 <ul>
 <li>
 Experience with AWS or other cloud platforms
 </li>
 <li>
 Knowledge of Docker or containerization
 </li>
 <li>
 Exposure to event streaming technologies such as Apache Kafka
 
 
 </li>
 </ul>
 
 🕹️ What your adventure will have in store:
 
 
 
 <ul>
 <li>
 🎯You'll have the exhilarating opportunity to contribute to a product that is highly appreciated by users and the cybersecurity community at large
 </li>
 <li>
 🎯 You'll experience a highly supportive and caring environment, fostering growth, flexibility, and autonomy
 </li>
 <li>
 🎯 You'll embark on an exciting journey of continuous learning and problem-solving, leveling up as our organization grows
 </li>
 <li>
 🎯 Most importantly, you'll have a blast at HTB 🥳 because fun is an essential ingredient in our recipe for success! Just wait until you see our global meet-ups!
 
 
 </li>
 </ul>
 
 💰The gems you'll be enjoying as a Senior Django Engineer:
 
 
 
 <ul>
 <li>
 25 annual leave days
 </li>
 <li>
 Paid paternity leave
 </li>
 <li>
 Dedicated budget for training and professional development, participation in conferences
 </li>
 <li>
 Full access to the Hack The Box lab offerings; so you can learn how to hack 😉
 </li>
 <li>
 State-of-the-art equipment (mac, iPhone, and mobile plan)
 
 
 </li>
 </ul>
 Our benefits package is designed to provide strong support to our team, but it may vary depending on location and type of employment (e.g., UK, Greece, or engagement through an Employer
 
 
 
 
 🗺️ The Quest of Becoming
 
 Senior Django Engineer:
 
 
 
 <ul>
 <li>
 Level 1: To complete level one's objective, submit your application.
 </li>
 <li>
 Level 2: Meet the Talent Acquisition team. Level's objective: highlight your past achievements, ambitions, and values
 </li>
 <li>
 Level 3: Meet the hiring team. Level's objective: connect with the hiring team and share with them your achievements.
 </li>
 <li>
 Level 4: Meet the hiring team, once again, to explore your leadership mindset and values alignment with HTB
 </li>
 <li>
 Level 5: Congratulations! Not many reach this level 💪. Level's objective: have a constructive, final conversation with senior leadership to explore the role and your future at HTB.
 </li>
 <li>
 Level 6: You've officially received an offer from HTB! To complete the last level and the Quest, all you need to do is accept the offer.
 </li>
 <li>
 Quest complete. Congratulations, you're officially one of us 🥳🎉🎇Your next quest: complete the onboarding
 
 
 
 </li>
 </ul>
 
 Hack Your Career, Today. Join us in this epic adventure of cybersecurity at Hack The Box! 🚀🔒💻
 
 
 
 
 
 About Hack The Box
 
 
 
 Hack The Box is the leading cybersecurity readiness and upskilling platform, trusted by enterprises, government organizations, and MSSPs to build cyber resilience at scale. Through AI-enhanced intelligence, gamified labs, live-fire simulations, and the power of one of the world's largest cybersecurity communities, Hack The Box helps teams master offensive and defensive skills in real-world scenarios. Founded in 2017, Hack The Box has grown its global community of over 4 million members, helping organizations validate resilience, mitigate breach risk, and develop cyber talent. For more information, visit hackthebox.com
 
 
 Rapidly growing its international footprint and reach, Hack The Box is headquartered in the UK, with additional offices in the US, Australia, and Greece.
 
 
 
 🚨 News &amp; Resources:
 
 
 
 <ul>
 <li>
 Get the most important updates on HTB's latest year!
 </li>
 <li>
 We're incredibly proud to share that our headquarters in the UK, along with our entities in Greece and the US, have been certified as a Great Place to Work for three consecutive years (2023 - 2025).
 </li>
 <li>
 In addition, our Greek entity has been recognized among the Best Workplaces in Greece (4th, 2nd, 3rd) and Europe (7th, 10th, 73rd) during this period &mdash; a testament to our strong culture and commitment to creating an exceptional employee experience!
 
 
 </li>
 </ul>
 Take a sneak peek at how it is to be part of HTB and our 2023 Global Retreat. Get more insights about our HTB culture and employee experience by visiting the "about us" section of our site, our career site, and Glassdoor.
 
 
 
 At Hack The Box, we are committed to fostering a diverse, inclusive, and equitable workplace. We believe that diversity enriches our performance, services, and the communities we serve. As such, we ensure that all job applications are considered solely based on merit, skills, and qualifications. We do not discriminate on grounds of race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. We are dedicated to providing a fair and respectful work environment that reflects our values.
 
</div>

Şanstech

<div>
 
 Location: Onsite, Istanbul/Maslak
 
 
 
 
 
 Description:
 
 
 
 
 
 We are seeking a Backend Developer to provide technical leadership and mentor a team of developers in designing and developing high-performance, scalable backend systems. The ideal candidate should have hands-on experience in building distributed systems, event-driven architectures, and microservices while ensuring the highest code quality and system reliability.
 
 
 
 
 
 Responsibilities:
 
 
 
 
 
 Lead and mentor a backend development team, ensuring best practices and high coding standards.
 
 
 Design and implement scalable and high-performance backend architectures.
 
 
 Actively participate in coding and software development to build scalable and high-performance backend architectures.
 
 
 Develop event-driven and distributed systems using message queues (Kafka, RabbitMQ, etc.).
 
 
 Optimize and manage relational (SQL) and non-relational (NoSQL) databases for high availability and performance.
 
 
 Utilize caching mechanisms (Redis, Memcached, etc.) to enhance system efficiency.
 
 
 Conduct code reviews and architectural discussions to maintain quality and scalability.
 
 
 Collaborate with cross-functional teams to align technical decisions with business needs.
 
 
 Stay updated with new technologies and incorporate them into the project when necessary.
 
 
 Work efficiently in an Agile/Scrum environment, participating in sprint planning, daily stand-ups, and retrospectives.
 
 
 
 
 
 Qualifications:
 
 
 
 
 
 Bachelor's degree in Computer Engineering, Computer Science, or a related field.
 
 
 At least 5 years of experience in backend development.
 
 
 Strong expertise in Java and Spring Boot.
 
 
 Hands-on experience with Aspect-Oriented Programming (AOP), preferably in Java with Spring AOP.
 
 
 Hands-on experience with microservices architecture.
 
 
 Proficiency in event-driven development and messaging systems (Kafka, RabbitMQ, etc.).
 
 
 Strong understanding of software security principles and experience in implementing secure coding practices.
 
 
 Experience working with SQL and NoSQL databases.
 
 
 Familiarity with caching mechanisms to optimize performance.
 
 
 Ability to thrive in a fast-paced, high-traffic system environment.
 
 
 
 
 
 Preferred Qualifications:
 
 
 
 
 
 Experience in high-traffic systems such as sports betting, e-commerce, or fintech.
 
 
 Knowledge of DevOps and CI/CD processes.
 
 
 Experience with cloud computing platforms (AWS, GCP, Azure).
 
 
 Familiarity with observability tools (Prometheus, Grafana, ELK Stack, NewRelic).
 
 
 
 
 
 What We Offer:
 
 
 
 
 
 Opportunities for technical and professional growth.
 
 
 A collaborative and dynamic work environment.
 
 
 
 
 
 
 
 
 Linkedin &uuml;zerinden elektronik olarak iletece&gbreve;iniz ki&scedil;isel bilgileriniz, &Scedil;anstech b&uuml;nyesinde olu&scedil;acak mevcut ve gelecek i&scedil;e al&inodot;m ihtiya&ccedil;lar&inodot; do&gbreve;rultusunda istihdam olanaklar&inodot;n&inodot;n de&gbreve;erlendirilmesi amac&inodot;yla 7 Nisan 2016 tarihli Resmi Gazete&rsquo;de yay&inodot;mlanan 6698 say&inodot;l&inodot; Ki&scedil;isel Verilerin Korunmas&inodot; Kanunu kapsam&inodot;nda veri sorumlusu olarak taraf&inodot;m&inodot;zca i&scedil;lenecek ve veri taban&inodot;m&inodot;zda gizlilik i&ccedil;erisinde saklanacakt&inodot;r. Detayl&inodot; bilgiye internet sitemizde (https://www.sans-technology.com/kvkk) Ayd&inodot;nlatma Metni i&ccedil;erisindeki &ldquo;&Ccedil;al&inodot;&scedil;an Aday&rdquo; alt ba&scedil;l&inodot;&gbreve;&inodot;ndan ula&scedil;abilirsiniz.
 
</div>

Backend Developer

Keyrock

<div>About Keyrock
Since our beginnings in 2017, we've grown to be a leading change-maker in the digital asset space, renowned for our partnerships and innovation.
Today, we rock with over 200 team members around the world. Our diverse team hails from 42 nationalities, with backgrounds ranging from DeFi natives to PhDs. Predominantly remote, we have hubs in London, Brussels, Singapore and Paris, and host regular online and offline hangouts to keep the crew tight.
We are trading on more than 80 exchanges, and working with a wide array of asset issuers. As a well-established market maker, our distinctive expertise led us to expand rapidly. Today, our services span market making, options trading, high-frequency trading, OTC, and DeFi trading desks as well as digital asset management. Keyrock is looking to expand and establish itself as a full-service financial institution through both organic innovation and inorganic growth.
But we&rsquo;re more than a service provider. We&rsquo;re an initiator. We're pioneers in adopting the Rust Development language for our algorithmic trading systems, and champions of its use in the industry. We support the growth of Web3 startups through our Accelerator Program. We upgrade ecosystems by injecting liquidity into promising DeFi, RWA, and NFT protocols. And we push the industry's progress with our research and governance initiatives.
At Keyrock, we're not just envisioning the future of digital assets. We're actively building it.
Mission statement 
We are seeking a Full Stack Web Engineer with a strong sense of UI/UX design and a proven track record in the financial services industry. Experience in the crypto or digital asset domain is highly valued. 
You will work across the entire technology stack - from data models and APIs to interactive, high-performance interfaces - building and refining products that deliver tangible business value. You are driven by a product mindset, validating ideas early and evolving them from functional to exceptional. You are language-agnostic, pragmatic in your technical choices, and unafraid to experiment when it serves the end user. 
You excel in collaborative environments, take ownership of your work, and contribute to a culture of technical excellence through reviews, mentorship, and shared learning. If you combine creativity in front-end craft with a deep appreciation for backend reliability and data integrity, this role is designed for you.
Job description<ul><li>
Deliver end-to-end product features - from backend APIs and data models to engaging, responsive UI components.</li><li>
Review and validate scalable software architectures, ensuring maintainability, reliability, and secure integrations across all layers.</li><li>
Champion good engineering practices, including code reviews, automated testing, documentation, and CI/CD workflows.</li><li>
Optimise performance across the stack through effective debugging, profiling, and system tuning.</li><li>
Collaborate with product, and engineering teams to translate complex business and user requirements into elegant, performant solutions.</li><li>
Maintain consistent operational hygiene through clear documentation, smooth migrations, and predictable deployments.</li><li>
Explore and share emerging technologies, with particular interest in Rust, WebAssembly, and modern API frameworks.</li></ul>
Background and experience<ul><li> 
Proven experience building full stack web applications with strong command of both frontend and backend principles.</li><li>
Proficiency in modern frontend frameworks (Vue, React or similar) and design systems or component libraries such as Shadcn.</li><li>
Experience developing robust backend services, ideally using Rust, or familiarity with typed backend languages</li><li>
Solid understanding of HTTP, RESTful API design, and performance optimisation in web contexts</li><li>
Hands-on experience with relational and/or NoSQL databases, schema design, and query optimisation.</li><li>
Familiarity with Git-based workflows, continuous integration, and automated testing practices.</li><li>
Strong debugging, problem-solving, and analytical skills.</li><li>
A product-oriented mindset - balancing quality, speed, and user impact effectively.</li><li>
Excellent collaboration and communication skills, with a proactive attitude toward improving systems and team dynamics.</li><li>
Product oriented mindset with the ability to focus on delivering value, validate early, and progressively refine solutions.</li></ul><h1 class="jobSectionHeader">
Preferred Qualifications</h1><ul><li>
Exposure to data-intensive, governance-driven, or fintech/crypto applications, and curiosity for Rust or distributed systems.</li><li>
Awareness of secure coding practices, authentication/authorisation models (OAuth2, OpenID Connect).</li><li>
Knowledge of data visualisation libraries (D3.js, Recharts, or similar).</li><li>
Familiarity with observability stacks (Grafana, Prometheus, Loki, Faro, or Datadog) and comfort instrumenting metrics, logs, and traces.</li><li>
Ability to design applications with self-observability in mind (e.g., health endpoints, tracing IDs, telemetry propagation).</li><li>
Exposure to Kubernetes, containerised environments, and Helm-based deployments.</li><li>
Understanding of CI/CD pipelines (GitLab CI) and infrastructure-as-code workflows.</li><li>
Experience working in cloud-native environments (AWS, GCP, or Azure) and awareness of security-first design.</li><li>
Comfort working with financial datasets, trade logs, or analytics dashboards.</li><li>
Experience handling sensitive or regulated data, ideally in financial or crypto contexts.</li></ul>
Our recruitment philosophy
We value self-awareness and powerful communication skills in our recruitment process. We seek fiercely passionate people who understand themselves and their career goals. We're after those with the right skills and a conscious choice to join our field. The perfect fit? A crypto enthusiast who&rsquo;s driven, collaborative, acts with ownership and delivers solid, scalable outcomes.
Our offer<ul><li>
A competitive salary package</li><li>
Autonomy in your time management thanks to flexible working hours and the opportunity to work remotely</li><li>
The freedom to create your own entrepreneurial experience by being part of a team of people in search of excellence</li></ul>
As an employer we are committed to building a positive and collaborative work environment. We welcome employees of all backgrounds, and hire, reward and promote entirely based on merit and performance.
Due to the nature of our business and external requirements, we perform background checks on all potential employees, passing which is a prerequisite to join Keyrock.
https://keyrock.com/careers/</div>

Senior Full Stack Web Engineer - Trading

Gizli

<div>
 
 
 INTRODUCTION
 
 
 
 We are seeking a
 
 Mid-Senior Backend Developer
 
 to join our
 
 Istanbul Maltepe Office
 
 and contribute to mission-critical backend systems in the
 
 defense industry
 
 . You will collaborate with frontend teams to build secure, scalable, and high-performance solutions using technologies like FastAPI, Docker, and MongoDB. In a
 
 dynamic, agile software development environment
 
 , you&rsquo;ll work on projects that demand precision, innovation, and adherence to strict security standards. If you thrive in a fast-paced setting and enjoy solving complex technical challenges in defense-grade systems, we want to hear from you.
 
 
 
 
 
 
 RESPONSIBILITIES
 
 
 <ul>
 <li>
 Design, develop, and maintain
 
 secure backend services
 
 using
 
 FastAPI
 
 (Python) and/or
 
 Go (Golang)
 
 for defense applications.
 </li>
 <li>
 Collaborate with
 
 frontend teams
 
 to integrate APIs, databases, and deployment pipelines.
 </li>
 <li>
 Implement and optimize
 
 SQL
 
 and
 
 NoSQL (MongoDB)
 
 solutions for mission-critical data storage.
 </li>
 <li>
 Build and maintain
 
 CI/CD pipelines
 
 using
 
 GitLab CI/CD
 
 for automated testing, deployment, and security compliance.
 </li>
 <li>
 Write
 
 unit/integration tests
 
 to ensure code reliability in a high-stakes environment.
 </li>
 <li>
 Containerize applications with
 
 Docker
 
 and manage deployments in secure infrastructure.
 </li>
 <li>
 Follow
 
 Git-based workflows
 
 (feature branches) in
 
 GitLab
 
 for collaborative, traceable development.
 </li>
 <li>
 Troubleshoot performance bottlenecks, debug issues, and enforce system scalability under strict security constraints.
 </li>
 </ul>
 
 
 
 
 
 REQUIREMENTS
 
 
 <ul>
 <li>
 
 3&ndash;5 years
 
 of backend development experience with
 
 FastAPI
 
 (Python) or similar frameworks (Flask, Django).
 </li>
 <li>
 Strong proficiency in
 
 SQL
 
 and
 
 NoSQL (MongoDB)
 
 .
 </li>
 <li>
 Hands-on experience with
 
 Docker
 
 for containerization and secure deployment.
 </li>
 <li>
 Familiarity with
 
 CI/CD pipeline
 
 automation tools (CI/CD, GitHub Actions, Gitlab CI/CD).
 </li>
 <li>
 Experience writing
 
 unit tests
 
 and ensuring code coverage for mission-critical systems.
 </li>
 <li>
 Professional
 
 English proficiency
 
 for clear communication in cross-functional teams.
 </li>
 <li>
 Ability to work independently and collaboratively in a
 
 fast-paced, agile environment
 
 .
 </li>
 <li>
 
 Familiarity with Linux systems
 
 and command-line tools (bash, shell, etc.) for development and deployment.
 </li>
 </ul>
 
 
 
 
 
 PREFERRED/PLUS IF YOU HAVE
 
 
 <ul>
 <li>
 Experience with
 
 Go (Golang)
 
 for backend development in secure systems.
 </li>
 <li>
 Familiarity with
 
 message queues
 
 (Kafka, RabbitMQ) or
 
 microservices architecture
 
 .
 </li>
 <li>
 Contributions to
 
 open-source projects
 
 or a portfolio of backend applications in security-sensitive domains.
 </li>
 <li>
 Experience with
 
 agile methodologies
 
 (Scrum, Kanban) and
 
 DevOps practices
 
 .
 </li>
 <li>
 Hands on experience with LLM frameworks, agentic pipelines and tools etc.
 </li>
 </ul>
 
 
 
 
 
 WHAT WE OFFER
 
 
 <ul>
 <li>
 
 Cutting-edge backend projects
 
 in the
 
 defense industry
 
 , with technologies like FastAPI, Docker, and MongoDB.
 </li>
 <li>
 A
 
 dynamic, agile-driven
 
 work culture with opportunities to take initiative and own high-impact tasks.
 </li>
 <li>
 
 Hybrid work model
 
 (2 days remote/week) and
 
 flexible working hours
 
 in a tech-forward environment.
 </li>
 <li>
 
 Competitive salary
 
 with
 
 performance-based bonuses
 
 and annual salary reviews.
 </li>
 <li>
 
 Private health insurance
 
 ,
 
 meal card
 
 , and
 
 transportation assistance
 
 .
 </li>
 <li>
 
 Team-building activities
 
 ,
 
 pre-work breakfast
 
 , and a
 
 positive, inclusive workplace
 
 .
 </li>
 <li>
 
 Career growth
 
 in a company committed to innovation, security, and engineering excellence.
 </li>
 </ul>
 
 
</div>

Back End Developer

Sezzle

<div>The salary range for this role is $2,800 - $6,000 per month (Gross in USD)

About Sezzle: 

With a mission to financially empower the next generation, Sezzle is revolutionizing the shopping experience beyond payments, blending cutting-edge tech with seamless, interest-free installment plans that make shopping smarter and more accessible. We're not just transforming payments; we're redefining how people discover, interact with, and purchase the things they love while driving real impact on merchant sales through increased conversions and higher order values. As we continue to shape the future of fintech and retail, we're building an innovative, dynamic team passionate about creating more than just a transaction but a truly unique shopping journey. If you're excited about pushing boundaries in tech and delivering a game-changing experience for consumers and merchants alike, come join us at Sezzle and help create the future of shopping!

Compensation:

For this mid-level development role, with 3-7 years of experience, the compensation range is $2,800 - $6,000 USD per month. This range is designed to reflect the skills, experience, and value brought to the team, ensuring competitive and fair pay within the industry.

About the Role:

We are seeking a talented and motivated Software Engineer II who is best in class with a high IQ plus a high EQ. This role presents an exciting opportunity to thrive in a dynamic, fast-paced environment within a rapidly growing team, with abundant prospects for career advancement. 
 As a Software Engineer II, you will be responsible for solving our most challenging problems along with a highly-motivated team.

In this role, you will work closely with other engineers across multiple teams to provide high-quality, scalable, and innovative products. Your day-to-day responsibilities will include partnering with other engineers to design, develop, and deliver new features. As your skills grow so will the size and scope of the projects which you'll be involved in. Sezzle has a strong culture for promotion with defined paths through Engineering that matches all levels. You'll be working as part of a full-stack Engineering team which has varied disciplines.

Key Role Responsibilities:
<ul>
<li>Build and maintain new innovative product features focused on actively learning new areas of the product</li>
<li>Collaborate with owners for different product features to gain insight and offer constructive suggestions for improvements</li>
<li>Be an active participant in design/architecture discussions sharing your ideas while building the next generation of features for the Sezzle platform
</li><li>Hands-on with our codebase and a contributor to code reviews</li>
<li>Mentor other engineers who are starting along their career path</li>
<li>Work with the team to continuously build and deploy scalable solutions</li>
<li>Assist in planning, estimations, and completion for projects brought up by the team stakeholders</li>
</ul>
Minimum Requirements:
<ul>
<li>Experience solving technical problems as part of a team</li>
<li>Bachelor's in computer science (preferred) or equivalent related experience</li>
<li>Familiarity with modern Frontend Development, with React experience preferred</li>
<li>Ability to solve problems with backend-focused languages like Go or similar compiled statically typed language</li>
<li>Intermediate understanding of relational databases like MySQL</li>
</ul>
Preferred Knowledge and Skills:
<ul>
<li>Knowledgeable in writing automated tests for applications (unit, integration, end-to-end)</li>
<li>Familiar with the basic principles and design of RESTful APIs</li>
<li>Basic knowledge of a Microservice Architecture</li>
<li>Close familiarity with software engineering tools, software development methodology, and release processes</li>
</ul>
About You:
<ul>
<li>You have relentlessly high standards - many people may think your standards are unreasonably high. You are continually raising the bar and driving those around you to deliver great results. You make sure that defects do not get sent down the line and that problems are fixed so they stay fixed.</li>
<li>You're not bound by convention - your success&mdash;and much of the fun&mdash;lies in developing new ways to do things</li>
<li>You need action - speed matters in business. Many decisions and actions are reversible and do not need extensive study. We value calculated risk-taking.</li>
<li>You earn trust - you listen attentively, speak candidly, and treat others respectfully.</li>
<li>You have backbone; disagree, then commit - you can respectfully challenge decisions when you disagree, even when doing so is uncomfortable or exhausting. You have conviction and are tenacious. You do not compromise for the sake of social cohesion. Once a decision is determined, you commit wholly.</li>
<li>You deliver results - you focus on the key inputs and deliver them with the right quality and in a timely fashion. Despite setbacks, you rise to the occasion and never settle.</li>
</ul>
Sezzle's Technology Stack:
<ul>
<li>Languages: Golang, Typescript, Python</li>
<li>Frontend: Typescript - React and React Native</li>
<li>Backend: Golang</li>
<li>Database: MySQL, Postgres, Elasticsearch</li>
<li>DevOps &amp; Cloud: AWS, Kubernetes</li>
<li>Version Control: Git</li>
<li>CI/CD: Gitlab</li>
<li>Testing: Developer-driven, focus on automated unit, integration, and end-to-end tests</li>
<li>Sezzle is focused on using open source, and we build what we can before buying!</li>
</ul>
What Makes Working at Sezzle Awesome?

At Sezzle, we are more than just brilliant engineers, passionate data enthusiasts, out-of-the-box thinkers, and determined innovators; we are skilled musicians, yogis, cyclists, chefs, golfers, dog-lovers, and rock-climbers. We believe in surrounding ourselves with not only the best and the brightest individuals, but those that are unique and purpose-driven in all that they do. Our culture is not defined by a certain set of perks designed to give the illusion of the traditional startup culture, but rather, it is the visible example living in every employee that we hire.

#Li-remote</div>

Software Engineer II (LATAM)

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