Sourav K.

Senior backend engineer specializing in Python — I build, scale, and own the systems that products run on. If you need a backend that holds up in production — clean APIs, solid architecture, and AI/LLM features that actually work — that's what I do. I'm a Top Rated Plus engineer with 6,200+ hours on Upwork, a 100% Job Success Score, and $90K+ earned, most of it from long-term engagements where clients trusted me to own their backend end to end. A few things clients consistently hire me for: ✅ Backend architecture & APIs from scratch I design and build production systems in Python — Django, FastAPI, and Flask — with REST APIs, relational and NoSQL data models, and clean, documented, testable code. I've led the backend of a live fintech platform (Medius AI) serving real banks and NBFCs in India. ✅ AI/LLM integration I bring AI into real products — OpenAI and other LLMs, prompt engineering, transcription (Whisper), and AI-driven workflows — not as a demo, but shipped and running. I've also worked as a senior Python code reviewer on LLM training data (RLHF / model-alignment workflows). ✅ Scaling & fixing existing systems I take over messy or half-finished codebases, stabilize them, and get them deployed and reliable — including taking sole backend ownership of an existing AI behavioral-health platform (Meomind). ✅ My core stack: Python · Django · FastAPI · Flask · REST APIs · PostgreSQL · MySQL · MongoDB · AWS · Docker · Celery · Redis. I'm comfortable across the full backend lifecycle — design, build, deploy, monitor, scale — and I can work into the frontend (React) when a project needs it. I prefer long-term, hourly engagements where I can take real ownership, but I'm happy with well-scoped fixed-price work when the requirements are clear. If you want a backend specialist who communicates clearly and ships reliably, let's talk!