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senior backend developer - node.js (fully remote, worldwide) Jobs in Istanbul

backend developer

Leartes

<div>
 
 
 🚀 We&rsquo;re Hiring: Backend Developer | Node.js | TypeScript
 
 
 
 
 
 
 
 Leartes Studios is a fast-growing game development company that collaborates with industry leaders such as Microsoft, Epic Games, Adobe, and Nintendo. We are one of the top publishers on the Unreal Engine Marketplace and Unity Asset Store.
 
 
 
 
 
 
 We&rsquo;re looking for a Backend Developer who is passionate about clean architecture, performance, and scalable system design. In this role, you will be responsible for designing, developing, and maintaining backend services, APIs, and data layers while collaborating closely with frontend and product teams.
 
 
 
 
 
 
 🎯 Responsibilities
 
 
 <ul>
 <li>
 Develop scalable, secure, and high-performance backend systems
 </li>
 <li>
 Design, implement, and maintain RESTful APIs
 </li>
 <li>
 Work with databases and optimize queries and data models
 </li>
 <li>
 Implement caching strategies using Redis to improve performance
 </li>
 <li>
 Integrate third-party and internal APIs
 </li>
 <li>
 Contribute to technical documentation and maintain clear system documentation
 </li>
 <li>
 Collaborate with team members using Git-based version control workflows
 </li>
 </ul>
 
 
 
 
 
 🧩 Qualifications - Required Skills
 
 
 <ul>
 <li>
 Strong experience with Node.js development
 </li>
 <li>
 Hands-on experience with AdonisJS or similar frameworks (NestJS, Express, etc.)
 </li>
 <li>
 Solid knowledge of TypeScript
 </li>
 <li>
 Experience using Redis and implementing cache strategies
 </li>
 <li>
 Experience working with databases
 </li>
 <li>
 Strong understanding of RESTful API design principles
 </li>
 <li>
 Proficiency with Git version control
 </li>
 </ul>
 
 
 
 
 
 Nice to Have
 
 
 <ul>
 <li>
 Experience with Next.js
 </li>
 <li>
 Familiarity with Tailwind CSS or UnoCSS
 </li>
 <li>
 Experience with Go
 </li>
 </ul>
 <li>
 </li>
 
 
 
 
 
 🎁 Perks &amp; Benefits
 
 
 <ul>
 <li>
 Meal card (Multinet)
 </li>
 <li>
 Supplementary private health insurance
 </li>
 <li>
 Hybrid working model
 </li>
 <li>
 Opportunity to work with industry-leading partners (Epic Games, Unity, Adobe, Tencent, etc.)
 </li>
 <li>
 Chance to contribute to global projects and build a strong portfolio
 </li>
 <li>
 Supportive, learning-focused team environment
 </li>
 <li>
 Hands-on experience in real production workflows and mentorship opportunities
 </li>
 </ul>
 
 
 
 
 📍 Contract Type: Full Time
 
 
 💻 Industry: Software / Web Technologies / SaaS
 
 
 🌍 Work Model: Hybrid / Remote
 
</div>

Backend Developer

Bitfinex

<div><h4 class="jobSectionHeader">The Original Bitcoin Exchange</h4>
Inspired by Bitcoin's vision of financial freedom, we are committed to empowering individuals to transact and connect seamlessly across the globe. From the early days of the Bitcoin revolution, our mission has been to champion freedom through innovative, reliable, and accessible technology&mdash;ensuring that everyone, everywhere, has the tools to participate in a truly open and borderless world.
We are driven by a relentless pursuit of innovation and financial empowerment. By prioritizing education and delivering a cutting-edge platform, we enable users to seamlessly buy, hold, and trade digital assets with confidence. As the digital asset landscape rapidly evolves, we stay ahead&mdash;offering state-of-the-art trading services that empower both individuals and global liquidity providers. Our forward-thinking, agile approach ensures that financial freedom is not just a vision, but a reality for all.
Our team, composed of visionary individuals with practical expertise, focuses on crafting solutions to the market's toughest challenges. Despite our global presence and impact, we maintain a small, technology-focused core, fostering a culture of collaboration and innovation.
We value integrity and autonomy, empowering our team to contribute from concept to launch. Driven by a passion for lifelong learning and a commitment to advancing freedom, we prioritize high-caliber products and services, with a proven track record of innovation that draws on the dexterity of our teams.<h4 class="jobSectionHeader">
Why Join Us?</h4>
Innovation
At Bitfinex, we merge technology and skill to create an environment where your involvement isn&rsquo;t just appreciated&mdash;it&rsquo;s pioneering the future and pushing boundaries in finance. Our culture values bold creativity, a passion for technology, and a deep belief in Financial Freedom.
Flexibility &amp; Global Reach
We believe in trust, autonomy, and results&mdash;our team operates remotely, ensuring you work from anywhere while collaborating with some of the best talents across the world. We thrive on innovation, autonomy, and breaking new ground.
Fast-Paced &amp; Impactful
Much like the crypto industry itself, our projects move fast, break new ground, and make an impact. Your contributions reach our global audience, shaping the narrative of a decentralized future.
A Team that Thrives on Collaboration
We blend seasoned experts with fresh creative minds, ensuring constant innovation, mentorship, and a dynamic work environment that keeps you at the forefront of achieving your goals. We see integrity and standing up for what is right as the most important qualities.
Grow with the Best
At Bitfinex, we&rsquo;re committed to continuous learning&mdash;whether through technological advancements, creative workshops, or mentorship from leading professionals in the industry.
If you&rsquo;re excited about partaking in shaping the narrative of decentralized finance, you&rsquo;ll feel right at home
We&rsquo;re looking for: Senior Backend Developer
<h4 class="jobSectionHeader">The Role:</h4> 
As a senior Backend Developer, you will be a part of the team that works on the development of the backend components of all Bitfinex Services (main trading application, Lightning Network support, Blockchain integrations, &hellip;.). This includes:<ul><li>
New Products and Features - Bitfinex continuously strives to create innovative new features in order to provide the most professional trading experience for customers. These are developed and deployed using agile methodologies, to ensure the user experience remains the best in the industry.</li><li>
Scalability - all backend services that power Bitfinex platform must remain effortlessly smooth, responsive, and real-time for customers as the platform continues to scale to accommodate new user growth. A good example are the renown Bitfinex API, the most solid, low-latency and complete in our industry.</li><li>
Security - Bitfinex makes Security its most important feature. The Backend Development team is responsible for building all the API services and backend processes with the highest security principles and standard, in order to protect the safety of the entire user base.</li></ul><h4 class="jobSectionHeader">
What You Bring to the Table:</h4><ul><li>
Exceptional Node/JavaScript skills</li><li>
Familiar with microservices architecture</li><li>
Have actively participated in the development of a complex platform</li><li>
Good experience in interacting with databases (MySQL, MongoDB)</li><li>
Ability to quickly learn new technologies</li><li>
Good understanding of security practices</li></ul><h4 class="jobSectionHeader">
Other Valuable Skills:</h4><ul><li>
Experience with blockchain integration</li><li>
Comfortable with high-availability concepts</li><li>
Ruby, Rust or C++ skills are a plus</li><li>
Other technologies of interest: Message queues (Redis), Caches and Job Queues</li></ul><h4 class="jobSectionHeader">
What We Offer:</h4><ul><li>
Flexible Work &amp; Remote-Friendly Culture</li><li>
Mentorship &amp; Growth</li><li>
Competitive Pay</li><li>
Career Development Opportunities</li><li>
Supportive Team Environment</li><li>
Learning &amp; Knowledge Sharing</li><li>
Team-Building Activities</li><li>
Social activities (online &amp; in-person)</li><li>
A collaborative environment where your creativity will have a direct impact on the brand&rsquo;s narrative</li></ul>
Ready to join us in bringing Financial Freedom to all? 
If you&rsquo;re a visionary who thrives at the intersection of technology, knowledge and innovation, we want to hear from you!
Recruitment Data &amp; Security Disclaimer
As part of the hiring process at Bitfinex, we collect personal data such as your name, contact details, location, job preferences, education and employment history, and other information you voluntarily provide. This data is used solely for recruitment purposes, processed in accordance with applicable global data protection laws, including the General Data Protection Regulation (GDPR) and the California Consumer Privacy Act (CCPA), and retained only for as long as necessary to fulfil its purpose.
All assessments and recruitment-related communications are conducted exclusively through official Bitfinex email addresses (e.g., firstname.lastname@bitfinex.com). Bitfinex does not use unofficial channels (such as WhatsApp, Telegram, or SMS) for recruitment communication and does not distribute assessments or sensitive links via those means.
As part of our secure and compliant recruitment process, we may use approved third-party platforms to facilitate candidate assessments. For more information, please refer to our Candidate Privacy Notice and Interview Recording Consent. All candidates have the right to access, correct, or delete their personal data and to withdraw consent at any time, where applicable.
Bitfinex will never request payments, financial information, or personal banking details at any stage of the recruitment process.
If you receive a suspicious request, wish to exercise your data privacy rights, or have further inquiries regarding the legal aspects of the process, contact privacy@bitfinex.com. Please note this inbox is intended for privacy concerns and reports only; any other communications will not be processed.
Equal Opportunity Statement
At Bitfinex, we're committed to equitable opportunities. We do not discriminate based on race, religion, gender, age, disability, sexual orientation, gender identity, or any other protected status. This commitment applies across all stages of recruitment and contractual relationships.</div>

Senior Backend Developer - Node.js (Fully Remote, Worldwide)

Medsien Inc.

<div>Medsien is the leading provider of scalable remote care management for a quality patient experience. Hundreds of organizations trust Medsien's unparalleled technology solutions to implement exceptional remote care management programs, personalize every interaction, and improve the lives of the people who need it most. Based in San Francisco and venture-backed by top-tier investors, Medsien was founded to reimagine remote care management.

More than 60% of all U.S. adults&mdash;over 150 million people&mdash;live with at least one chronic condition, which requires dedicated, ongoing medical support outside the four walls of their doctor's office. And yet, only 20% of these patients have access to remote care from the comfort of their homes, putting their health at significant risk. Together, we can save lives and create a real impact.

Medsien is a venture-backed healthcare SaaS company experiencing rapid growth and looking to expand our team. We are seeking organized, motivated, and passionate Full-Stack Engineer to join our team of talented and inspiring developers in a fast-paced environment.

As a Full-Stack Engineer, you'll work on new exciting projects with full autonomy. We're looking for a candidate who is passionate about building new applications from the ground up and who will join a growing team in developing the products that enable providers to provide high quality services to their patients.

As a Full-Stack Engineer, you will:
<ul>
<li>Implement and document new software apps and components,</li>
<li>Understand how code fits into broader technical and/or business contexts,</li>
<li>Actively participate in code review and technical design reviews,</li>
<li>Work on medium to large projects. Participate in all system/component implementation and design from development to production,</li>
<li>Research new technologies and prototype new ideas,</li>
<li>Ensure high testability and quality of delivered software,</li>
<li>Work with the Operations team to troubleshoot and fix defects in software,</li>
<li>Participate in building Scrum processes and agile culture within the company.</li>
</ul>
Please apply if you have:
<ul>
<li>4+ years of back-end development experience,</li>
<li>Having worked in a dynamic, agile environment with minimal supervision,</li>
<li>Extensive experience with Python/Django,</li>
<li>A creative and driven mindset with experience navigating through ambiguity and a desire to work in a fast-paced, results-driven environment,</li>
<li>A desire to learn and try new approaches/ ideas and stretch boundaries,</li>
<li>Extreme problem solving skills,</li>
<li>Outstanding communication skills,</li>
<li>Bachelor's Degree or higher in Computer Science, or a related field of study,</li>
<li>Perfect English skills; both written and oral,</li>
<li>Residence in Istanbul city center.</li>
</ul>
For this position, we offer:
<ul>
<li>competitive USD salary and stock options,</li>
<li>Flexible vacation and PTO policies,</li>
<li>Fully remote work opportunities,</li>
<li>Training, mentorship, and coaching from leadership.</li>
</ul>
Please bear in mind that:
<ul>
<li>This is a permanent-term contractor job opportunity with Medsien Inc.
</li><li>Due to in-person collaboration requirements, candidates based in Istanbul are preferred.</li>
<li>All interviews will be conducted in English and the candidates having less than advanced level of English will be directly eliminated from the process regardless of their technical skills and expertise.</li>
</ul>
Our Process

We will review your application along with all the others we receive and pick the top profiles for a screening call. In many cases due to time constraints and our candidate volume, only the short-listed candidates are contacted but we do consider each application carefully. If you have been selected as a short-listed candidate, we will contact you for a short screening call to get to know you better. If you don't get a call, please don't be disappointed! We receive many applications for each role and must prioritize who we speak to.

Employment at Medsien is based solely on a person's merit and qualifications. We are committed to providing equal employment opportunity regardless of sex, age, race, color, national or ethnic origin, religion, marital status, pregnancy, sexual orientation, gender identity or expression, disability, age, citizenship, veteran or military status, and other legally protected characteristics.

Thank you for taking the time to apply for a position at Medsien!

Please visit the below links for GDPR details:

https://www.medsien.com/legal/employee-candidate-information-notice

https://www.medsien.com/legal/employee-candidate-explicit-consent-statement</div>

Full-Stack Engineer (Back-End skewed)

Hästens

<div><h4 class="jobSectionHeader">Business Developer - T&uuml;rkiye</h4> 
Results, growth, profit &mdash; this is the mindset we are looking for. 
We are looking for a Business Developer with entrepreneurial DNA - a builder, a driver, and challenger - to join our journey for a world where people sleep well.
We seek individuals who raise the bar beyond what others think is possible, and then deliver on it. Are you business minded and know how to turn strategy into execution and execution into results and want to excel in a performance-based culture with no ceiling on potential earnings?
This is your opportunity to take ownership, shape your market together with our partners and make a lasting impact on a global luxury brand.
Key Responsibilities<ul><li>
Build and inspire: Develop and empower our retail partners to reach new heights of performance.</li><li>
Own your market: Lead H&auml;stens&rsquo; growth in your region with an entrepreneurial mindset &ndash; act as an owner, not an employee.</li><li>
Drive results: Open doors, close deals, and create opportunities others only dream of.</li><li>
Execute: Design and implement business action plans that redefine success.</li><li>
Represent: Strengthen H&auml;stens&rsquo; position as a global luxury brand through your strategic leadership.</li><li>
Leadership: Travel, negotiate, and influence at the highest levels across your region, with occasional trips to Sweden and other international destinations.</li></ul>
Key Deliverables<ul><li>
Annual Business Action Plans with activities to improve traffic, revenue and conversion rates, and reach sales targets.</li><li>
Tracking of BAP activity outcomes against plans.</li><li>
Achieve yearly sales targets.</li><li>
Bi-yearly visual merchandising reports, with agreed improvement plans.</li><li>
Store visit reports.</li></ul>
Key Skills and Requirements<ul><li>
Bachelor&rsquo;s degree in Business, Marketing, Economics, or a related field (Master&rsquo;s degree is a plus).</li><li>
Proven entrepreneurial spirit &ndash; you take ownership, show initiative, and deliver without waiting for direction.</li><li>
Ideally some experience from founding, scaling, or leading a business.</li><li>
Strong commercial acumen with a focus on creating mutual growth with partners.</li><li>
Demonstrated record of achieving and exceeding ambitious targets.</li><li>
Experience in luxury sales, retail (B2B/B2C) and HNWI customer relationships is advantageous.</li><li>
Strategic, fearless, and competitive &ndash; you play to win and inspire others to do the same.</li><li>
Analytical and action-oriented &ndash; you plan, execute, and own your results.</li><li>
Fluent in English and Turkish.</li><li>
Valid driver&rsquo;s license with flexibility to travel approximately 80%.</li></ul>
Some things we offer<ul><li>
A global stage where your performance is recognized and rewarded.</li><li>
The freedom and responsibility to act as an entrepreneur within a fast-growing international brand.</li><li>
The opportunity to compete and win at the highest level in luxury retail.</li><li>
A performance-based culture where ambition, leadership, and results are celebrated.</li><li>
Unlimited earning potential for those who deliver exceptional outcome.</li></ul>
This position is based remotely, with travel as required.</div>

Business Developer - Istanbul, Türkiye

Sezzle

<div>The salary range for this role is 3,333 USD - 4,200 USD 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!

About the Role:

We are seeking a talented and motivated AI Engineer II who is best in class, with a high IQ and a high EQ. This role presents an exciting opportunity to thrive in a dynamic, fast-paced environment within a rapidly growing team, with strong prospects for continued growth and increased ownership.

As an AI Engineer II on the Applied AI team, you will take on end-to-end ownership of complex platforms and systems that power Sezzle's AI-driven capabilities. Your work will span initiatives such as building AI-powered platforms from scratch, developing intelligent automation and orchestration systems, and embedding proprietary AI solutions directly into customer-facing products, internal tools, and operational workflows.

You will operate in highly ambiguous problem spaces, working closely with product, engineering, and operations teams to identify opportunities where AI can drive meaningful impact &mdash; whether that's enhancing the customer experience, improving decision-making, or automating complex workflows. This role is ideal for engineers ready to move beyond scoped execution and into leading solutions: shaping architecture, driving implementation, and ensuring that what is built is reliable, scalable, and genuinely useful for both external users and internal teams.

What You'll Do:
<ul>
<li>Lead the design, development, and ownership of AI-powered internal platforms and systems, including initiatives built from the ground up.</li>
<li>Own end-to-end delivery of complex projects, from problem discovery and system design through production rollout and iteration.</li>
<li>Design and implement AI-driven features, intelligent automation, and orchestration systems that enhance customer experiences and compound productivity across teams.</li>
<li>Embed AI capabilities into customer-facing products, internal tools, and operational workflows, ensuring solutions integrate naturally and deliver measurable value.</li>
<li>Build full-stack systems spanning backend services, APIs, data layers, and frontend interfaces.</li>
<li>Translate ambiguous business and operational problems into scalable, maintainable, AI-enabled technical solutions.</li>
<li>Apply strong systems thinking to ensure reliability, performance, security, permissions, and auditability across platforms.</li>
<li>Collaborate closely with engineers, teams, and stakeholders across the company to identify high-impact opportunities and drive adoption.</li>
<li>Participate in production support and incident response for owned systems, helping define and uphold reliability and operational best practices.</li>
<li>Mentor AI team members through code reviews, design feedback, and hands-on guidance, raising the overall quality bar of the team.</li>
</ul><h3 class="jobSectionHeader">What We Look for:</h3>
<ul><li>3&ndash;5 years of professional experience in software engineering, AI engineering, platform engineering, or related roles.</li>
<li>Hands-on experience designing, building, and shipping AI-powered systems into production environments.</li>
<li>Strong proficiency in Python, SQL, and frontend frameworks such as React.</li>
<li>Proven experience designing and owning production-grade full-stack systems.</li>
<li>Experience working with distributed systems, internal platforms, or complex data workflows.</li>
<li>Ability to operate effectively in ambiguous problem spaces and drive solutions with minimal direction.</li>
</ul><h3 class="jobSectionHeader">Preferred Qualifications:</h3>
<ul><li>Experience building AI-first platforms or internal products from scratch, including early architectural decisions.</li>
<li>Strong foundation in core machine learning and data science principles, including supervised/unsupervised learning, feature engineering, model evaluation, and statistical inference.</li>
<li>Experience with transformer architectures (BERT, GPT, etc.) and understanding of attention mechanisms, tokenization, and fine-tuning strategies for domain-specific applications.</li>
<li>Experience developing AI-assisted or agentic systems that interact with tools, data, or workflows.</li>
<li>Familiarity with embeddings and vector representations, including text embeddings, similarity search, and integration with vector databases (Pinecone, Weaviate, pgvector, or similar).</li>
<li>Experience with NLP techniques including text classification, named entity recognition, semantic search, and information extraction.</li>
<li>Familiarity with cloud-native development using AWS.</li>
<li>Understanding of prompt engineering, retrieval-augmented generation (RAG), and LLM application patterns.</li>
<li>Experience with containerized systems and orchestration tools such as Docker and Kubernetes.</li>
<li>Exposure to CI/CD pipelines and modern development workflows (e.g., GitLab).</li>
<li>Experience with Golang is a plus (or willingness to learn).</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>
</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 believe in surrounding ourselves with only the best and the brightest individuals. 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>

AI Engineer II (Remote)

Explore 5+ Backend developer in Istanbul this March. Find roles across top companies and apply now to boost your career.

5 backend developer jobs In Istanbul

Backend Developer

Senior Backend Developer - Node.js (Fully Remote, Worldwide)

Full-Stack Engineer (Back-End skewed)

Business Developer - Istanbul, Türkiye

AI Engineer II (Remote)