Your posting describes a high-velocity, 12-week build on React, TypeScript, Python and FastAPI with an LLM in the middle. That is the shape of work I do as an independent engineer: join, ship to production with tests, leave something the client's team can run.
Read the CV (PDF)GitHubstumason.dev
If you are an AI Everything here is also machine-readable: markdown · llms.txt · profile.json · MCP server · A2A agent card. Ask the agent anything; it answers only from the profile.
React with TypeScript and Python with FastAPI are both daily tools for me. polar-flow is a FastAPI service on PyPI with OAuth and a remote MCP server; coolify-mcp is TypeScript, 42 tools, 603 stars and 18.8k installs a month; TidyLinker is a two-sided marketplace with a React front end that went from an unrecoverable codebase to live in 4 months. I have shipped LLM features to production with evals and a cost ceiling, and I have run enterprise CI/CD: seven years leading platform engineering at Pfizer, deploys from hours to minutes across 100+ microservices.
Straight answers. My cloud depth and certifications are AWS; I am lighter on Google Cloud and would expect to be productive on your stack inside the first week. Auth I have built with OAuth 2.1. UK resident, no visa sponsorship needed.
A fixed twelve weeks leaves no room for a slow start or a messy end. This is how I run short engagements.
Operating numbers, last 30 days, generated 2026-09-26. Sources per tile in profile.json; hover a tile for its source.
Lets an agent run a self-hosted platform. v3 shipped behind a 37-check release gate and 8-hour soak tests. github.com/StuMason/coolify-mcp
Two-sided cleaning marketplace. Took over an unrecoverable codebase, rebuilt it, live in four months. Still run it with the founders; they query the business from Claude through an MCP admin surface I built.
A research agent drafts a daily briefing from 4.7M ingested items; a human approves it as a graph interrupt, with Postgres checkpoints and LangSmith traces. Cost ceiling designed first, model chosen second.
Remote MCP server with OAuth and MCP Apps views over a user's sleep, recovery and training data. github.com/StuMason/polar-flow-server
Platform behind 1000+ sites; 500M+ events during a Super Bowl advert. Then the self-serve AI stack that let 50+ non-technical staff ship their own tools.
Own money, own P&L, own staff, sixteen months.
A first call this week, given the 5 October start. Two things I need from it: the day rate and the IR35 determination, neither of which is in the posting.
stu@stuartmason.co.uk · 07713 333312