Koushan De

Co-Founder

Kolkata, West Bengal, India2 yrs 9 mos experience

Key Highlights

Expert in building scalable microservices.
Proven track record in optimizing API performance.
Strong background in backend development with Go and Java.

Stackforce AI infers this person is a Fintech backend engineer with expertise in scalable microservices and system design.

Contact

Skills

Core Skills

GoJava

Other Skills

gRPCRubyRedisSpring BootTerraformRuby on RailsDatabasesApache KafkaLow-Level DesignJava Database Connectivity (JDBC)Data StructuresMicroservicesSpring MVCHigh-Level DesignC++

About

Passionate software engineer specializing in Java, Kotlin, Go, Spring Boot, PostgreSQL, and distributed systems. Experienced in building scalable, high-performance microservices and working on low-level and high-level system design. Driven by an innate curiosity for technology, I love diving deep into complex systems, understanding their intricacies, and building elegant, efficient solutions.

Experience

2 yrs 9 mos

Total Experience

1 yr 2 mos

Average Tenure

4 mos

Current Experience

Lumiagen labs

Freelance

Jan 2026 – Present · 4 mos · Kolkata

Creating software solutions for businesses

Razorpay

Software Development Engineer

Mar 2025 – Dec 2025 · 9 mos · Bengaluru, Karnataka, India · On-site

Delivered backend features across customer, rewards marketplace and authentication services using Go and Ruby.
Built & enhanced key APIs including end-to-end integration logic.
Implemented secure encryption/decryption system and built password-protected ZIP workflows.
Upgraded logging across services using Slog with PII-safe structured logging, removing legacy dependencies.
Added Redis caching layers reducing API latency from ~300ms to ~70ms and lowering DB load.
Diagnosed and resolved multiple cross-service bugs.
Leveraged AI tools (Cursor, ChatGPT, Copilot) to accelerate development, testing, and high-quality code delivery.

GogRPC

Navi

Software Development Engineer

Jul 2023 – Mar 2025 · 1 yr 8 mos · Bengaluru, Karnataka, India · On-site

Led development of a reward service revamp, scaling to 500k RPM and delivering offers under tight deadlines.
Built a PAN verification system for TDS compliance, achieving 95% verification rate and saving Rs. 1 Cr+ in taxes.
Created a checkpoint service to reduce reward drops by 7%, achieving 0% drop rate and ensuring flawless disbursement.
Engineered Navi's first merchant partnership with Meesho, scaling rewards from 200 to 10,000 requests/day and boosting Meesho sales via Navi UPI.
Designed and developed backend for rewards platform, enabling teams to create, modify, and delete reward constructs, improving operational efficiency.
Overhauled UPI registration flow by integrating Razorpay, optimizing KYC validation for millions of users.
Conducted a technical session on Grafana Tempo, enhancing team skills in distributed monitoring and tracking.

Spring BootJava

Chegg inc.

Subject Matter Expert

Nov 2022 – Jun 2023 · 7 mos · United States · Remote

- Provided 100+ expert-level solutions and academic assistance in computer science, ensuring high-quality, accurate, and timely responses to support students globally.