Ritanshu K.

I'm the engineer founders bring in when a product needs to be built and owned end to end -architecture, backend, frontend, DevOps, and ML where it earns its place - without hiring a full in-house team. 5,600+ hours on Upwork. Top Rated Plus. 99% Job Success. Every rated contract at 5.0. My largest engagement ran 14 months as Technical Architect on a single product (4,000+ hours). Clients keep me for a year or more, not a sprint. What I do: Architect and build B2B SaaS products from spec to production Own the full stack: Python backends, React frontends, cloud infrastructure, CI/CD Ship ML that runs in production - model iteration pipelines, annotation tooling, deployment Act as technical lead: scoping, trade-offs, code quality, delivery Recent work: Technical Architect - led architecture and delivery for a production platform over 14 months B2B finance & accounting SaaS - full-stack build DevOps + web app integration - infrastructure, backend logic, and UI, delivered to spec ML engineer - weekly model iteration cycles for a live product Text annotation web app - custom data-labeling tooling with a clean interface From a client on a 500-hour project: "Excellent work and strong technical judgment throughout the project. He is a true leader. He delivered clean UI and reliable backend logic, and everything matched the spec." Stack: Python, FastAPI/Django, React, PostgreSQL, Docker, AWS/GCP, CI/CD, PyTorch/scikit-learn, LLM APIs Best fit: founders and small teams building a real product who want a senior engineer they can hand ownership to. Not a fit for one-off bug fixes or quick tweaks. How I work: written specs, working software every week, direct communication, fixed weekly hours or retainer. If you're building something that needs a technical owner, send me the brief and I'll tell you how I'd approach it.