Vinod Kumar

I’m a backend software engineer who builds reliable microservices and performance-focused APIs, with a strong bias toward clear contracts, test coverage, and production readiness.

At DREX, I overhauled OpenAPI 3.0 specs for high-throughput services, improving backend–frontend integration turnaround by 40%+. I also hardened security and reliability by engineering NestJS guards with full E2E test coverage, cutting unauthorized access attempts and regression failures by 50–60%.

I delivered core financial modeling logic for a 25-year renewable-energy viability calculator across 9 LATAM markets, enabling accurate USD projections, FX normalization, and profitability scoring to support multi-million-dollar proposals.

Most recently, I re-engineered a real-time discussion forum using WebSockets and MongoDB, reducing average query resolution time from 30 minutes to under 5 minutes (83% reduction). I’ve also optimized database and monitoring (Prometheus/Grafana) to improve latency, and I enjoy building systems like real-time seat reservations with Redis-backed TTL locks and chat messaging with WebSockets and RabbitMQ.