Gaurav User

I’m a software engineer focused on building production-ready backend systems and shipping AI-powered features end-to-end. At COASTOK, I designed and executed a zero-downtime migration of 5 TB from AWS S3 to Cloudflare R2, including a dual-write consistency layer and automated validation, which reduced storage costs by ~40%.

I build services with FastAPI, Ktor, and Node.js, backed by PostgreSQL, MongoDB, and Redis. I’ve owned production APIs and reliability features like JWT authentication, rate limiting, request caching, GraphQL APIs, and third-party integrations handling thousands of daily requests.

Recently, as a Remote Software Engineer (Contract), I developed data ingestion and validation pipelines for human-preference evaluation workflows at Microsoft and Meta—aggregating and quality-checking ratings from thousands of evaluators to support model improvement cycles. I also delivered full-stack enterprise workflows across Python and JavaScript, covering REST API design, integrations, and backend processing.

Alongside work, I’ve been building open-source and applied projects, including an AI runtime inspired by Ollama (provider-agnostic routing, GraphQL/REST APIs, async request handling, session management, and Docker-based deployments). I’ve also trained a YOLOv5s model on 17,000+ images at IBM (Object Orion), and I enjoy tackling hard problems where systems engineering meets practical ML.