Open to opportunities

Koushan De

@koushande

Message

Passionate back-end engineer focused on secure, high-performance systems and scalable services.

Thailand

Message

What I'm looking for

I'm seeking backend roles focused on building secure, scalable microservices with strong observability, performance optimization, and cross-team impact.

I am a back-end engineer with strong experience building scalable microservices, optimizing performance, and implementing secure systems using Go, Java (Spring Boot), Ruby and related technologies. I've delivered high-impact services at scale—designing reward platforms, integrating payments/UPI flows, and improving latency and observability across systems.

I take a pragmatic, security-first approach: I built encryption/decryption and password-protected ZIP workflows, introduced PII-safe structured logging, and added Redis caching to reduce API latency from 300ms to 70ms. I enjoy solving hard reliability and performance problems and using automation and AI tools to accelerate delivery while maintaining high code quality.

Experience

Work history, roles, and key accomplishments

Software Development Engineer

Razorpay

Mar 2025 - Dec 2025 (9 months)

Delivered backend features across customer, rewards marketplace and authentication services using Go and Ruby, added Redis caching reducing API latency from 300ms to 70ms, and improved logging with PII-safe structured logs.

Go Ruby Redis Docker Grafana RESTful APIs Logging Microservices

Software Development Engineer - 1

Navi Technologies

Jul 2023 - Mar 2025 (1 year 8 months)

Led design and development of a rewards nudge service scaling to 500k RPM, implemented PAN verification achieving 95% verification rate and ₹1Cr+ tax savings, and engineered checkpointing to eliminate reward drops.