Java Developer (Contract)

Responsibilities: Design, develop, and maintain scalable backend systems for high-volume transaction processing and international payment gateway integrations. Develop secure and high-performance APIs for internal and external system integration. Write clean, maintainable, and testable code following engineering best practices. Contributes to architecture design for scalable, resilient, and fault-tolerant systems. Implement event-driven and asynchronous processing for backend services. Support integration across multiple internal and external platforms. Design and implement message-driven architectures using enterprise messaging systems. Optimize application, database, and service-level performance. Perform load testing and identify system bottlenecks. Troubleshoot production issues and perform root cause analysis (RCA). Ensure system stability and reliability in high-throughput environments. Work closely with DevOps teams to support CI/CD pipeline implementation. Manage build, deployment, and release processes across environments. Requirements: Bachelor’s degree in computer science, software engineering, or a related field. 5-7 years of experience in Java backend development. Strong proficiency in Java 8+ (preferably Java 21) and Spring Boot. Proven experience with microservices architecture, event-driven architecture, and REST API development. Hands-on experience with messaging systems, preferably Solace. Strong experience with MySQL, including database tuning, SQL optimization, indexing, and query tuning. Experience with unit testing frameworks such as JUnit and Mockito. Proficiency in Maven, Git, Jira, and Jenkins-based CI/CD pipelines. Experience in load testing, performance testing, and backend optimization. Strong troubleshooting and debugging capabilities, including production issue resolution and root cause analysis. Proven experience in e-commerce, banking, or other high-volume transaction environments. Strong experience building distributed, scalable, and high-availability systems. Hands-on experience implementing microservices and event-driven architecture in production environments. Experience handling performance-critical and real-time backend systems. Demonstrated ability to work in production support and critical incident resolution environments. Hands-on experience with AWS, Docker, and Terraform will be an added advantage.