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.