Umar Aftab Q.

Your Java backend struggling under load, microservices not talking to each other properly, or a half-built Spring Boot platform that needs someone to take it forward? I help teams ship reliable, production-ready backend systems using Java and Spring Boot, not just tutorial-level CRUD apps. With 5+ years building backend systems for fintech and digital banking platforms, I specialize in: Core Java & Spring Boot Java 17/21, Spring Boot 3, Spring Security, Spring Data JPA, Hibernate, REST API design and documentation. Microservices Architecture Service decomposition, API gateway patterns, service discovery, inter-service communication, scalable event-driven design. Messaging & Async Processing Apache Kafka, RabbitMQ, event-driven architecture, reliable message processing for real-time systems. Databases & Performance PostgreSQL, MySQL, query optimization, caching with Redis. Security OAuth2, JWT, secure API design, authentication and authorization flows. What I typically own end-to-end: New Java/Spring Boot backend builds — REST APIs, admin tools, internal platforms Microservices design and implementation Legacy code audits, refactors, and stabilization Bug fixes and performance troubleshooting on existing Java systems Why work with me: Top Rated on Upwork with 100% Job Success Score across 16 completed contracts. Clients consistently note clear communication, fast delivery, and reliable code quality. Send me your project details or the one issue you're stuck on. I'll reply with a clear plan and realistic timeline.