Products shipped for clients, and things I built on my own time
Professional Work
EasyYMM — Shopify App
Renben Technologies, Pte. Ltd.
▪Co-developed (2-person team) a live automotive Year/Make/Model filtering app in React and Node.js; achieved 50+ installs and $300+ cumulative revenue within 6 months of launch
React
Node.js
Shopify
Intage — Mobile Survey Platform
Renben Technologies, Pte. Ltd.
▪Delivered a full-stack React Native / Node.js survey platform validated across 200+ beta responses in 3 client PoCs; engagement converted to a recurring monthly SRE maintenance contract
React Native
Node.js
Bread — NGO Library App
Renben Technologies, Pte. Ltd.
▪Architected and led migration of a 20-endpoint REST API backend from Next.js to NestJS for a library platform serving schoolchildren — decomposed monolith into service-bounded modules, TDD-enforced Jest suite, zero-disruption A/B deployment strategy
▪Delivered a cross-platform mobile library app with admin dashboard, deployed at 2 schools for an NGO aligned with the UN SDG on Quality Education
NestJS
Next.js
React Native
Jest
REST API
Ambitus — Azure DevOps Marketplace Extension
Caravel Labs, Inc.
▪Shipped a TypeScript / React / Node.js extension to the Azure DevOps Marketplace, reaching 250+ installs and 100+ monthly active users with zero paid acquisition; added Application Insights telemetry for adoption tracking
▪Automated DORA metric calculations (deployment frequency, lead time, change failure rate) with customizable 1-week–6-month tracking windows to benchmark deployment performance
TypeScript
React
Node.js
Azure DevOps
Application Insights
Personal Projects
DocuChat — RAG Document Chat
April 2026 · Full Stack / AI Systems
▪Designed multi-tenant vector isolation via a dual-namespace Pinecone strategy (userId + projectId) to prevent cross-project data leakage at the retrieval layer
▪Diagnosed and resolved a cross-project data leakage bug during development — traced retrieval contamination between projects for the same user, re-architected to project-scoped namespace isolation, validated via Vercel observability tooling
▪Financial calculator suite covering FD, RD, PPF, SIP, and Gold Loan EMI calculations with interactive graphs and a daily finance quotes feed served via Google Sheets API
▪UPI payment system backed by Ethereum smart contracts, with Solidity contracts exposed via REST API. Backend secured with JWT and MetaMask auth; containerized with Docker and deployed on DigitalOcean. Won Diversion 2023 — Kolkata's first MLH Hackathon.