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

About CodeNinjaCodeNinja 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 RoleWe 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 ResponsibilitiesDesign, develop, and maintain scalable microservices using Spring Boot and/ QuarkusBuild, publish, and manage APIs using IBM API Connect (APIC)Ensure high performance, security, and scalability of backend systems and APIsCollaborate with cross-functional teams including product, QA, and DevOpsTroubleshoot, debug, and resolve production issues efficientlyFollow best practices for clean code, testing, and system designContainerize applications using Docker and deploy on Kubernetes/OpenShiftImplement authentication/authorization using OAuth2/JWT standardsWrite unit, integration, and contract testsCollaborate with DevOps on CI/CD pipelinesParticipate in code reviews, design discussions, Agile ceremoniesMonitor, troubleshoot, and optimize microservices performance in productionRequirements5+ years of experience in Java backend developmentStrong hands-on experience with Spring Boot and QuarkusSolid understanding of microservices architectureFamiliarity with API security and performance optimizationJava 11+ specifically (not just "Java backend development")OpenShift alongside Kubernetes (currently only Docker/K8s is nice-to-have — should move to required)Proficiency with Git and CI/CD tools (Jenkins, GitLab CI)Working knowledge of SQL/NoSQL databasesNice to HaveExperience in Open Banking or financial services domainKnowledge of OAuth2, JWT authenticationHands-on experience with Docker, Kubernetes, and cloud platforms (AWS, Azure, or GCP)Apache Kafka or other messaging/event-streaming platformsObservability tools — Prometheus, Grafana, ELKWhy Join UsOpportunity to work on scalable, enterprise-level systemsCollaborative and growth-focused environmentExposure to modern technologies and architectureDisclaimerThis job description outlines the primary responsibilities and qualifications for the role at the time of posting. It is not exhaustive and may evolve in line with business needs and project requirements. CodeNinja reserves the right to modify role scope as the engagement progresses.All candidates will be subject to standard background verification. Onsite positions require compliance with the client's site access, security, and NDA policies. CodeNinja is an equal opportunity employer and welcomes applications from all qualified individuals regardless of background.