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

Requirements

5+ years of experience in Java backend development
Strong hands-on experience with Spring Boot and Quarkus
Solid understanding of microservices architecture
Familiarity with API security and performance optimization
Java 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 databases

Nice to Have

Experience in Open Banking or financial services domain
Knowledge of OAuth2, JWT authentication
Hands-on experience with Docker, Kubernetes, and cloud platforms (AWS, Azure, or GCP)
Apache Kafka or other messaging/event-streaming platforms
Observability tools — Prometheus, Grafana, ELK

Why Join Us

Opportunity to work on scalable, enterprise-level systems
Collaborative and growth-focused environment
Exposure to modern technologies and architecture

Disclaimer

This 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.

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