Senior Java Backend Developer (Spring Boot / Quarkus / API)

About CodeNinja CodeNinja is a next-generation technology consulting firm specialising in AI-powered transformation, enterprise software delivery, and Quality Engineering. Headquartered in the Gulf region and operating across the MENA, South Asia, and global markets, CodeNinja partners with Tier-1 banks, government entities, and large enterprises to design, build, and run mission-critical technology programs. With deep expertise in QA transformation, test automation, DevOps modernisation, and AI/ML engineering, CodeNinja's teams combine global delivery standards with in-market contextual knowledge — ensuring outcomes that are compliant, scalable, and commercially aligned with client objectives. For the Client's Test Management Enablement & Automation engagement, CodeNinja brings a dedicated 12-person specialist team spanning Test Management, Automation Engineering, AI/ML, and Performance Testing — all governed under a structured 20-week program delivery framework. About the Role We are looking for a highly skilled Senior Java Backend Developer with strong expertise in building scalable microservices and APIs. The ideal candidate will have hands-on experience with Spring Boot or Quarkus and API management using IBM API Connect (APIC). Experience in the Open Banking domain will be considered a strong advantage. Key Responsibilities • Design, develop, and maintain scalable microservices using Spring Boot and/ Quarkus • Build, publish, and manage APIs using IBM API Connect (APIC) • Ensure high performance, security, and scalability of backend systems and APIs • Collaborate with cross-functional teams including product, QA, and DevOps • Troubleshoot, debug, and resolve production issues efficiently • Follow best practices for clean code, testing, and system design • Containerize applications using Docker and deploy on Kubernetes/OpenShift • Implement authentication/authorization using OAuth2/JWT standards • Write unit, integration, and contract tests • Collaborate with DevOps on CI/CD pipelines • Participate in code reviews, design discussions, Agile ceremonies • Monitor, troubleshoot, and optimize microservices performance in production