Badam Rajasekhara Reddy User

I’m a Java Full Stack Engineer with 4+ years of experience building secure and scalable FinTech payment platforms across acquiring, switching, settlement, and transaction lifecycle management.

I specialize in backend microservices with Java 8/17, Spring Boot, Spring Security, REST APIs, and JPA/Hibernate—integrating payment acquiring and switching workflows for card, UPI, and payment gateway transactions.

I’ve implemented ISO 8583 message processing, Kafka-based event-driven transaction tracking, retry handling, and failed transaction recovery, while optimizing concurrency with Java Virtual Threads and semaphore-based throttling to improve stability under peak load.

I bring end-to-end delivery ownership: deploying Spring Boot and Angular on AWS EC2 with Docker, Jenkins CI/CD, Nginx reverse proxy/load balancing, and SSL/TLS. I also build operational dashboards and reports, and I’m careful about security (JWT, AES/RSA, SAST/SCA) and performance (MongoDB aggregation optimization reducing dashboard latency ~70%).