senior back end java developer

Perfect Vision

Job Title: Senior Back-end DeveloperEssential Functions<ul><li>Develop and maintain high-concurrency IoT PaaS services using the SpringBoot framework.</li><li>Design and implement IoT data collection endpoints for various communication protocols (TCP, UDP, MQTT, HTTP).</li><li>Build scalable data consumption and analysis endpoints for real-time IoT data processing.</li><li>Create robust data push endpoints and business-side APIs for seamless integration.</li></ul>Duties And Responsibilities<ul><li>Develop audio/video alarm file services and streaming media components.</li><li>Design modular architecture with protocol-specific device access components.</li><li>Write protocol decoders following predefined rules for new IoT device integrations.</li><li>Implement webhook and OpenAPI methods for third-party platform integration.</li><li>Optimize system performance for high-throughput IoT data scenarios.</li><li>Conduct comprehensive code reviews and provide technical mentorship.</li><li>Collaborate with frontend developers, DevOps engineers, and product managers.</li><li>Lead backend architecture decisions and technical initiatives.</li><li>Implement comprehensive testing strategies and monitoring solutions.</li><li>Promote and enforce development best practices and coding standards.</li><li>Participate in agile development processes and sprint planning.</li></ul>Qualification, Education, Training &amp; Certification required <ul><li>Bachelor's degree in Computer Science, Software Engineering, or a related field, or equivalent experience.</li></ul>Minimum Experience &amp; Skills Required <ul><li>7+ years of professional Java backend development experience.</li><li>Proven track record of building high-concurrency distributed systems.</li><li>Experience working in agile development environments.</li><li>Experience in a senior or lead developer role.</li><li>Expert proficiency in Java (Java 8+) and the Spring ecosystem (SpringBoot, Spring MVC, Spring Security, Spring Data).</li><li>Strong proficiency with ORM and persistence frameworks, including Hibernate, JPA, JDBC, and MyBatis.</li><li>Strong experience with the Netty framework for network programming and protocol handling.</li><li>Proficiency with message queue systems (RabbitMQ, Apache Kafka).</li><li>Experience with Redis for caching and session management.</li><li>Knowledge of MongoDB for document-based data storage.</li><li>Proficiency with MySQL and relational database design.</li><li>Understanding of IoT communication protocols (TCP, UDP, MQTT, HTTP, WebSocket).</li><li>Knowledge of webhook implementation and third-party system integration.</li><li>Familiarity with streaming media protocols and audio/video processing.</li><li>Experience with version control systems (Git) and collaborative workflows.</li><li>Understanding of microservices architecture and distributed systems.</li><li>Experience with RESTful API design and OpenAPI specifications.</li></ul>Job Type: Full-timeWork Location: In person

Senior Back-end Developer

Orascom Investment Holding

<div>Position: Senior Back-End Developer
Organization: OSL for Entertainment Projects
OSL, under Orascom Investment Holdings umbrella, is leading the transformation of the iconic Pyramids Sound &amp; Light Show. Through advanced sound, light, and projection technologies, OSL is reimagining the storytelling of ancient Egypt, offering visitors a multi-sensory, educational, and inspiring experience. This project reinforces Egypt's cultural legacy while positioning the Pyramids as a world-class tourism destination. 
LinkedIn account: https://www.linkedin.com/company/osl-for-entertainment-projects/?viewAsMember=true 
Job Description:
The Senior Back-End Developer is responsible for designing, building, and optimizing scalable back-end systems that power eCommerce solutions. Focused on developing high-performance, secure, and reliable APIs, services, databases, and integrations using .NET Core and NestJS, while applying best practices for microservices and cloud-based architectures
Key Responsibilities:
Core Development<ul>
<li>Design, develop, and maintain scalable back-end applications using .NET Core (C#, Entity Framework) and NestJS.</li>
<li>Develop and manage RESTful APIs and contribute to GraphQL services.</li>
<li>Architect, optimize, and maintain relational (SQL Server, PostgreSQL) and NoSQL databases.</li>
<li>Ensure system security (authentication, authorization, encryption, data protection).</li>
<li>Implement caching, load balancing, and performance optimizations for high-traffic environments.</li></ul>
Collaboration &amp; Delivery<ul>
<li>Work closely with front-end developers to provide seamless integration.</li>
<li>Collaborate with product managers, designers, and DevOps engineers.</li>
<li>Align with Tech Leads and architects on long-term technical direction.</li>
<li>Participate in agile development cycles, delivering features reliably and on time.</li></ul>
Quality &amp; Continuous Improvement<ul>
<li>Write clean, maintainable, and testable back-end code.</li>
<li>Implement and maintain automated testing (unit, integration, API tests).</li>
<li>Participate in peer code reviews to maintain best practices and consistency.</li>
<li>Suggest and implement improvements in development processes, DevOps, and CI/CD pipelines.</li><li>
Stay updated on .NET Core, NestJS, and cloud technologies.</li></ul> 
Qualifications:<ul><li>
Bachelor's degree in computer science, Software Engineering, or equivalent.</li><li>
7+ years of professional back-end development experience.</li><li>
Strong expertise in .NET Core (C#, ASP.NET Core, Entity Framework).</li><li>
Experience building APIs and services with NestJS.</li><li>
Database expertise (SQL Server, PostgreSQL, NoSQL).</li><li>
Experience with microservices, distributed systems, and RESTful APIs.</li><li>
Familiarity with cloud platforms (Azure preferred; GCP/AWS are a plus).</li><li>
Good understanding of DevOps practices (CI/CD, Docker, Kubernetes).</li><li>
Strong debugging, performance optimization, and security skills.</li><li>
Knowledge of GraphQL and API gateways.</li><li>
Exposure to event-driven architectures (Kafka, RabbitMQ).</li><li>
Familiarity with monitoring tools (New Relic, Prometheus, etc.).</li></ul></div>

Senior Back-End Developer

VoPay International Inc.

Senior Backend DeveloperLocation: Doha Full-Time In Office RoleAbout VoPay International Inc.VoPay&rsquo;s Fintech-as-a-Service platform enables any business to embed financial services and payment capabilities into their existing applications, products, or services through a single, scalable API. Our integrated technology gives product managers and developers the flexibility and speed to build innovative financial solutions in a rapidly evolving industry.Role OverviewYou'll play a vital role in developing and maintaining the infrastructure that powers our innovative payment platform. Collaborate with a talented, cross-functional agile team to build scalable, performant, and secure solutions that directly impact our clients' success. If you're a problem-solver who thrives in a fast-paced environment and are excited about the future of fintech, we want to hear from you!Key Responsibilities:<ul><li>Design, develop, test, deploy, maintain, and improve robust and scalable software applications.</li><li>Architect and implement high-performance APIs that power our platform.</li><li>Proactively identify and resolve code inefficiencies, proposing and implementing effective solutions.</li><li>Contribute to technology evaluations and rapid prototyping of new solutions.</li><li>Develop maintainable, scalable, and performant systems, adhering to best practices in security, accessibility, and design.</li><li>Troubleshoot and resolve application issues, ensuring a seamless client experience.</li><li>Collaborate closely with team members in an agile environment, fostering a culture of shared learning and innovation.</li><li>Manage server and database infrastructure to ensure optimal performance and reliability.</li><li>See projects through from conception to completion, taking ownership and driving results.</li></ul>Qualifications:<ul><li>Bachelor's degree in Computer Science or equivalent practical experience.</li><li>7+ years of experience in back-end development.</li><li>Strong proficiency in PHP (preferred) or other server-side languages (Python, Ruby, Java, .NET).</li><li>Solid understanding of relational databases (MySQL or similar).</li><li>Experience with AWS services (EC2, S3, RDS, Aurora) is a significant advantage.</li><li>Proven ability to design and develop APIs.</li><li>Excellent verbal and written communication skills.</li><li>Strong problem-solving abilities and attention to detail.</li><li>A passion for innovation and a desire to contribute to a dynamic team.</li></ul>Nice to have:<ul><li>Experience with payment processing or fintech.</li><li>Familiarity with microservices architecture.</li><li>Contributions to open-source projects.</li></ul>Vopay International Inc. is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.Job Type: Full-time

Senior Backend Developer

Devspark Labs

Senior Backend Developer &ndash; Java (4&ndash;5 Years Experience)We&rsquo;re looking for a highly skilled Senior Backend Developer (Java) who thrives on building scalable, secure, and high-performance systems. If you&rsquo;re passionate about writing clean code, optimizing performance, and delivering production-ready solutions, this role is for you.Responsibility:<ul><li>Architect, develop, and maintain robust backend services and APIs</li><li>Write clean, efficient, and well-structured Java code</li><li>Build scalable, high-availability systems for real-world applications</li><li>Collaborate closely with Frontend, QA, and DevOps teams</li><li>Optimize performance, troubleshoot issues, and ensure system reliability</li><li>Conduct code reviews and mentor junior team members</li><li>Integrate third-party services and manage production deployments</li></ul>Qualification Required:<ul><li>Bachelor&rsquo;s degree in Computer Science or a related field</li><li>4&ndash;6 years of hands-on backend development experience in Java</li><li>Strong expertise in Spring Boot or similar frameworks</li><li>Solid experience with RESTful APIs</li><li>Proficiency in databases such as PostgreSQL or MongoDB</li><li>Working knowledge of Git, CI/CD pipelines, and DevOps practices</li><li>Experience with Docker is a strong advantage</li></ul>Job Type: Full-timeWork Location: In person

Senior Java Backend Developer

<div><div>We help the world run better 
At SAP, we keep it simple: you bring your best to us, and we'll bring out the best in you. We're builders touching over 20 industries and 80% of global commerce, and we need your unique talents to help shape what's next. The work is challenging &ndash; but it matters. You'll find a place where you can be yourself, prioritize your wellbeing, and truly belong. What's in it for you? Constant learning, skill growth, great benefits, and a team that wants you to grow and succeed.</div><div></div> 
Job Title: Senior Developer &ndash; Java Full Stack Development
Location: Devanahalli, Bangalore North 
We are seeking a Senior Developer Engineer (Development Expert) with deep Java/J2EE expertise to join the SuccessFactors Application Engineering team. You will architect, build, and optimize cloud-scale, multi-tenant services and robust APIs that power SAP SuccessFactors. This role is hands-on and high-impact, focusing on modern Java platforms, performance, security, and reliability for enterprise SaaS. You will also help evolve next‑generation frameworks and automation, with opportunities to incorporate AI-assisted development.
What you&rsquo;ll build<ul><li>
Design and deliver cloud-native, multi-tenant Java services using Spring Boot including REST/OData APIs, data access layers, and integration components.</li><li>
Collaborate with Senior and Central Architects to ensure designs meet functional and non-functional requirements, emphasizing security, scalability, performance, maintainability, and observability.</li><li>
Own end-to-end engineering: solution design, implementation, code reviews, testing, deployment, and production operations.</li><li>
Implement robust database models and access patterns using JPA/Hibernate; tune SQL and queries; manage schema changes using migration tools.</li><li>
Build event-driven and batch processing components using Kafka; apply resiliency patterns (circuit breakers, retries, backoff).</li><li>
Improve system reliability and performance via JVM and GC tuning, profiling, concurrency best practices, and efficient resource utilization.</li><li>
Establish and evolve CI/CD pipelines (Jenkins/GitHub Actions), automated testing (JUnit/Mockito), code quality gates, and infrastructure-as-code where applicable.</li><li>
Promote a culture of engineering excellence: mentorship, design reviews, technical documentation, and continuous improvement.</li><li>
Contribute substantially to the technical roadmap and platform modernization initiatives.</li><li>
Leverage AI-assisted coding tools (e.g., GitHub Copilot) to increase developer productivity and code quality where appropriate.</li><li>
Design and implement MCP (Model Context Protocol) integrations to enable secure, standardized model-to-system tooling:<ul><li>
Build MCP-compliant servers and tools in Java to expose enterprise capabilities and data safely to AI agents and assistants.</li><li>
Collaborate with AI/ML teams to operationalize MCP-based workflows in production, aligning with security, compliance, and scalability requirements.</li></ul></li></ul>
What you bring<ul><li>
Bachelor&rsquo;s or Master&rsquo;s degree in Computer Science, Engineering, or related field; 7+ years of professional software engineering experience.</li><li>
7 &ndash; 10 years of hands-on Java/J2EE development, with strong mastery of Java 11/17+, collections, streams, generics, and concurrency.</li><li>
Expert in Spring ecosystem (Spring Boot, Spring Data, Spring Security) and/or Jakarta EE (JAX-RS, CDI, JPA); strong REST/ OData API design skills.</li><li>
Proven experience building and operating large-scale, distributed, monolith and microservices-based systems in production.</li><li>
Strong foundation in data structures, algorithms, and distributed computing.</li><li>
Proficient with RDBMS (Hana, PostgreSQL or MySQL), advanced SQL, query optimization, indexing, and schema design; experience with migration scripts.</li><li>
Experience with messaging (Kafka), caching (Redis) and one NoSQL store (e.g., MongoDB, Cassandra).</li><li>
Cloud experience with AWS, Azure, or SAP BTP; containerization and orchestration (Docker, Kubernetes).</li><li>
Excellent debugging and performance tuning skills (profilers, heap/thread dumps, JVM/GC tuning).</li><li>
Solid understanding of security best practices (OAuth2, JWT, secure coding, secrets management).</li><li>
Strong collaboration and leadership skills; able to mentor peers and lead by example.</li><li>
Hands-on experience with AI-assisted coding tools like GitHub Copilot is a plus.</li><li>
Experience with MCP, agent/tooling frameworks, or secure model integrations is a plus.</li></ul>
Nice to have<ul><li>
Experience with multi-tenant SaaS architectures, SLOs/SLIs, and SRE practices.</li><li>
Experience modernizing monoliths to microservices and domain-driven design.</li><li>
Familiarity with SAP technologies and SAP BTP is a plus, but not required.</li></ul> 
Where you belong (Meet your team)
SAP SuccessFactors is a premier cloud-based HCM suite serving millions of users globally. Join a business application-focused engineering team that values craftsmanship, performance, and reliability. You&rsquo;ll work in a collaborative environment that encourages innovation, automation, and continuous learning. Your contributions will directly influence enterprise-grade applications and services used worldwide, with opportunities to shape modern engineering practices and thoughtfully integrate AI-assisted development.
#DevT3 #LifeAtSAP<div> 
Bring out your best 
SAP innovations help more than four hundred thousand customers worldwide work together more efficiently and use business insight more effectively. Originally known for leadership in enterprise resource planning (ERP) software, SAP has evolved to become a market leader in end-to-end business application software and related services for database, analytics, intelligent technologies, and experience management. As a cloud company with two hundred million users and more than one hundred thousand employees worldwide, we are purpose-driven and future-focused, with a highly collaborative team ethic and commitment to personal development. Whether connecting global industries, people, or platforms, we help ensure every challenge gets the solution it deserves. At SAP, you can bring out your best.
 
 
We win with inclusion 
SAP&rsquo;s culture of inclusion, focus on health and well-being, and flexible working models help ensure that everyone &ndash; regardless of background &ndash; feels included and can run at their best. At SAP, we believe we are made stronger by the unique capabilities and qualities that each person brings to our company, and we invest in our employees to inspire confidence and help everyone realize their full potential. We ultimately believe in unleashing all talent and creating a better world. 
 
SAP is committed to the values of Equal Employment Opportunity and provides accessibility accommodations to applicants with physical and/or mental disabilities. If you are interested in applying for employment with SAP and are in need of accommodation or special assistance to navigate our website or to complete your application, please send an e-mail with your request to Recruiting Operations Team: Careers@sap.com. 
 
For SAP employees: Only permanent roles are eligible for the SAP Employee Referral Program, according to the eligibility rules set in the SAP Referral Policy. Specific conditions may apply for roles in Vocational Training. 
 
Qualified applicants will receive consideration for employment without regard to their age, race, religion, national origin, ethnicity, gender (including pregnancy, childbirth, et al), sexual orientation, gender identity or expression, protected veteran status, or disability, in compliance with applicable federal, state, and local legal requirements. 
 
Successful candidates might be required to undergo a background verification with an external vendor.</div><div></div><div> 
AI Usage in the Recruitment Process</div><div>
For information on the responsible use of AI in our recruitment process, please refer to our Guidelines for Ethical Usage of AI in the Recruiting Process.
</div>Please note that any violation of these guidelines may result in disqualification from the hiring process. 
 
Requisition ID: 445983 | Work Area: Software-Design and Development | Expected Travel: 0 - 10% | Career Status: Professional | Employment Type: Regular Full Time | Additional Locations: #LI-Hybrid</div>

Senior Developer - Java Full Stack (Devanahalli, Bangalore North)

Selfdrive

Job Title: Senior Java Developer &ndash; Payments Domain Location: Dubai (Onsite) Experience: 7+ yearsAbout the Role: We are seeking a highly skilled Senior Java Developer with deep expertise in the payments domain to join our dynamic team. The ideal candidate will have extensive experience in designing, developing, and maintaining secure and scalable payment applications, APIs, and transaction processing systems.Key Responsibilities:&middot; Design, develop, and maintain Java-based payment applications and services.&middot; Work on transaction processing systems, payment gateways, and financial APIs.&middot; Develop high-performance, scalable, and secure solutions for payment processing.&middot; Integrate with third-party payment providers, banks, and fintech APIs.&middot; Collaborate with cross-functional teams including business analysts, QA, and DevOps.&middot; Troubleshoot and resolve production issues ensuring minimal downtime.&middot; Perform code reviews, mentor junior developers, and ensure adherence to coding standards and best practices.&middot; Participate in architecture discussions and provide technical leadership.&middot; Ensure compliance with PCI DSS, GDPR, and other relevant payment security standards.Required Skills &amp; Experience:&middot; 7+ years of professional experience in Java development (Java 8+ preferred).&middot; Strong knowledge of Spring Boot, Spring MVC, and Spring Security.&middot; Experience with RESTful and SOAP APIs, microservices architecture, and cloud platforms (AWS/Azure/GCP).&middot; Hands-on experience with payment processing systems, POS, card payments, UPI, or digital wallets.&middot; Strong understanding of databases: SQL (MySQL, PostgreSQL, Oracle) and NoSQL (MongoDB, Redis).&middot; Familiarity with message queues (Kafka, RabbitMQ) and event-driven architecture.&middot; Knowledge of Agile/Scrum methodologies.&middot; Excellent problem-solving skills, analytical thinking, and ability to work under pressure.Preferred Skills:&middot; Experience with Fraud detection systems or risk management in payments.&middot; Knowledge of blockchain or crypto-based payment systems.&middot; Familiarity with CI/CD pipelines, Jenkins, Docker, Kubernetes.&middot; Experience in performance tuning and optimization of high-volume transaction systems.Education:&middot; Bachelor&rsquo;s or Master&rsquo;s degree in Computer Science, Information Technology, or related field.What We Offer:&middot; Competitive salary and benefits package.&middot; Opportunity to work on cutting-edge payment technologies.&middot; Collaborative and inclusive work environment.&middot; Career growth and professional development opportunities.Apply Now &ndash; Send your CV and portfolio to talent@self-drive.aeAbout the Company:Welcome to the Future of Personal Mobility at Self Drive.A Mobility Tech Platform Established in 2016 in the Middle East with its Head Quarters in DUBAI and a team of over 140+ employees that operates across 10 countries around the world.Self Drive Mobility is backed by car manufacturers, dealers and the top leasing companies with managing assets worth over USD 1 Billion on its platform making it the fastest-growing Mobility Tech Company in the GCC Region.Self Drive Mobility operates across UAE, Oman, Qatar, Bahrain, Kuwait, Saudi Arabia, Turkey, Ireland, Scotland, United Kingdom and India with an fleet of over 25000+ units offering Daily | Weekly | Monthly car subscription rentals &amp; Digital Leasing Solutions targeting D2C &amp; B2B Clients.The company achieved a milestone by serving 1.5 million customers &amp; reached 3 Million days of reservation &amp; is currently the largest mobility platform across in the Middle East.Workplace Type:OnsiteApplication Open:Apply only if you can join us immediately or serving notice period.Salary:AED10,000- AED12,000Location:B3, Office number 406, Dubai Commercity, Umm ramool, Al Rashidiya, Dubai, UAE.Job Types: Full-time, PermanentJob Types: Full-time, PermanentPay: AED10,000.00 - AED12,000.00 per month

Senior Java Developer- Payments Domain

Knowledge City, LLC

Job DescriptionPosition Overview:The Back-End Developer is a crucial member of the Product Development team, responsible for developing and maintaining the server-side logic and infrastructure that powers the Technology Division&rsquo;s products. This role involves working closely with front-end developers, database administrators, and other team members to ensure seamless integration of various system components. The Back-End Developer ensures that applications are efficient, secure, and scalable to meet the growing demands of the organization.Key ResponsibilitiesServer-Side Logic and Database Integration:<ul><li>Develop and maintain robust server-side logic to support various functionalities of the web applications.</li><li>Design, manage, and optimize relational databases, ensuring high performance and data integrity.</li><li>Implement complex queries and database optimizations as needed.</li></ul>API Development and Integration:<ul><li>Design, develop, and maintain APIs for both internal and external use, ensuring they are efficient, secure, and well-documented.</li><li>Integrate third-party services and APIs, facilitating seamless interaction between external systems and the company&rsquo;s products.</li></ul>Security and Data Protection:<ul><li>Implement security best practices to safeguard applications and user data.</li><li>Regularly review and update security measures to stay ahead of potential vulnerabilities.</li></ul>Collaboration with Cross-Functional Teams:<ul><li>Work in close coordination with front-end developers, designers, and other team members to ensure cohesive product development.</li><li>Participate in code reviews and contribute to the overall improvement of the codebase.</li></ul>Performance Optimization and Troubleshooting:<ul><li>Continuously monitor and optimize back-end systems for performance, reliability, and scalability.</li><li>Identify, troubleshoot, and resolve issues related to server-side logic, databases, and APIs.</li></ul>Documentation and Best Practices:<ul><li>Maintain thorough documentation of back-end processes, APIs, and database structures.</li><li>Adhere to and promote coding standards and best practices within the development team.</li></ul>Skills &amp; QualificationsBachelors in Computer Science, Software Engineering or a related field5+ years of relevant experience required.Technical Expertise<ul><li>Extensive knowledge and work experience with PHP.</li><li>Having experience in Symfony is a big plus.</li><li>Proficiency in MySQL Database (self-hosted and/or Amazon RDS).</li><li>Good experience with RESTful API development.</li><li>Good knowledge and experience of microservices architecture.</li><li>Familiarity with security best practices and data protection protocols is a big plus.</li><li>Good knowledge of AWS and Oracle cloud services.</li><li>Experience in version control systems like Git and repository hosting services like Bitbucket.</li></ul>Collaboration and Communication:<ul><li>Strong ability to work in a team-oriented environment, with effective communication and collaboration skills.</li><li>Capacity to explain complex technical concepts to non-technical stakeholders.</li></ul>Problem-Solving and Analytical Skills:<ul><li>Strong analytical skills for debugging and optimizing code.</li><li>Ability to troubleshoot and resolve complex issues quickly and effectively.</li></ul>Adaptability and Learning:<ul><li>Willingness to stay updated with emerging front-end technologies and industry trends.</li><li>Open to continuous learning and adapting to new tools and methodologies.</li></ul>Soft Skills:<ul><li>Advanced English proficiency, both written and spoken, is mandatory for effective communication with partners and clients.</li></ul>Benefits:<ul><li>Competitive salary based on experience.</li><li>Paid Time Off</li><li>Friendly and supportive team environment.</li><li>Access to an extensive library of training materials and company courses.</li><li>Opportunity to develop towards automation or management.</li></ul>Position Impact:The Back-End Developer plays a pivotal role in ensuring the stability, security, and efficiency of the Technology Division&rsquo;s products. Their contributions are vital for the seamless operation of the applications, directly impacting user experience, product performance, and overall customer satisfaction. The back-end systems and processes developed by this role are fundamental to the scalability and success of the company&rsquo;s digital offerings.Join Our Team:If you're driven by curiosity, eager to tackle challenges, and ready to make an impact in the fast-evolving E-Learning space, we'd love to hear from you. Join KnowledgeCity and help us make the world more professional and better!Job Type: Full-timeExperience:<ul><li>PHP : 5 years (Required)</li></ul>Work Location: In person

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