Tejveer S.

🚀 Senior Java Backend Developer | 4.3 Years | Fintech & UPI Expert I'm a backend engineer with 4.3 years of deep experience in the fintech and UPI payments domain, specializing in building secure, scalable, and high-performance payment systems. I’ve worked closely with Indian banks (Canara, Cosmos, and SBM bank) and NPCI, successfully launching complete UPI ecosystems including P2P, P2M, merchant onboarding, refund APIs, and PSP integrations. 🔧 What I Bring: • 800+ NPCI-test cases done on UPI APIs (P2P, P2M, PSP, Mandate, Refunds) • Full-stack UPI system development – Issuer, Acquirer, Merchant sides • RESTful Java Spring Boot APIs for real-time transactions • Secure, audit-compliant refund engines for failed transactions • Java, Spring Boot, Hibernate, REST, MySQL, GCP, AWS, Git, CI/CD pipelines 🏦 Domain Experience: • Launched UPI infrastructure for SBM Bank from scratch • Worked with top Indian banks for UPI merchant payments and PSP onboarding • Over 800+ test cases done and passed with NPCI • Involved in live deployments, production support, and performance tuning 💼 Why Hire Me? • Deep domain knowledge: UPI, NPCI, payment lifecycle • Real-world fintech systems already running in production • Focused on quality, scalability, and clean architecture • Can work part-time or full-time — based on project need Let’s build something secure, scalable, and fintech-ready together.