Mateus Cerqueira S.

I build AI automations and custom software for US teams, and I maintain what I build. My work history is right below. Five-star reviews on every contract, and a client who kept coming back. Some of the work: • An n8n engine that replaced a manual multi-agent handoff process • A Chrome extension that pulled vehicle data a dealership was copying by hand • A React and Supabase training app, built from spec to production • Inventory and cost systems that show an owner what each product costs • VPS setup and maintenance for self-hosted n8n running client automations Stack: n8n, Supabase/PostgreSQL, React/TypeScript, Node, edge functions, Chrome extensions, OpenAI and Claude APIs. Before I write code I ask what the project is supposed to change in the business. You get a plan first, then the build, then something you can run without me. I work in writing. Chat, email and written updates instead of calls. Decisions stay on record, and my communication is endorsed on most of my contracts. One US client accounts for most of that history. It started as a single server setup and grew into most of the work above. Getting hired back is harder than getting hired once.