Sayantan Dasgupta

I’m a backend-focused engineer with 2.5 years of experience designing and shipping production server-side systems end-to-end—from requirements gathering with business and product stakeholders through deployment, monitoring, and iteration.

At Renben Technologies, I built and maintained production systems including a layered TypeScript/Express.js/Node.js REST API (with strict service/controller/repository separation) and an Azure Application Insights monitoring setup with a custom telemetry dashboard; the extension reached 50+ MAU in its first month. I also led a migration from Next.js to NestJS by decomposing a monolith into clean service boundaries, enforcing TypeScript type-safety across layers, and adding comprehensive unit + integration tests to enable zero-service-disruption feature development.

Previously at Tata Consultancy Services, I engineered Python automation integrated into CI/CD pipelines, reducing data pipeline processing time by ~90%, while maintaining robust unit/integration test coverage using Jest and Docker. In my projects, I applied AI and LLMs to production—building DocuChat with a multi-tenant backend using Pinecone isolation—and I triaged and fixed a production data leakage issue by re-architecting retrieval to prevent cross-user contamination.