Nishit Nalin Srivastava

Backend Engineer with 5+ years of experience building scalable payment systems and microservices in Java 21 and Spring Boot. Specialized in low-level protocol engineering, event-driven architecture, and platform modernization in banking and payments. Currently building AI-powered SaaS products using LLM integration. At Deutsche Bank, I've built a TCP/IP payment gateway from scratch, decomposed a monolithic orchestrator into event-driven microservices via Kafka, and migrated 25+ services to Java 21 in 3 weeks. Outside work, I built and shipped a complete AI-powered Resume Builder SaaS — React frontend, FastAPI backend, Gemini AI for resume parsing and ATS optimization, payment gateway, Google OAuth — deployed and live at resume-builder-black-nu.vercel.app at zero infrastructure cost. I take freelance projects across the full spectrum — backend APIs, full-stack web apps, AI/LLM integrations, automations, DevOps, or anything that needs solid engineering. I pick things up fast and I ship.