Mateus Lima—Senior Software Engineer · São Paulo
Custom web apps, MVPs, and AI integrations — built by a senior engineer with real production experience. Based in São Paulo.
Who this is for
If you're an early-stage founder with a real product to build — not just an idea — and you want a senior engineer who will own the delivery from architecture to launch, let's talk.
From architecture to launch. TypeScript, Node.js, Bun, Next.js, PostgreSQL. 4–8 weeks typical delivery.
Add intelligence to your product using the Claude API, OpenAI, or custom pipelines. Document processing, automation, intelligent workflows.
Payment integrations (PIX, BTG), WhatsApp Business API, third-party API architecture, performance at scale.
A selection of work I've shipped to production.
PIX payment pipeline, WhatsApp Business API (HSM) integration, and AI-powered document validation. Co-leading an ongoing migration from .NET to Bun, Elysia.js, and Next.js.
Current employer — shown as production experience, not a client project.
Editorial site redesign and a Nuvemshop store for a competitive Taekwondo team.
Full frontend redesign built with Next.js and Tailwind.
confiareservicos.com.brAI REST API built with FastAPI, Hugging Face, and Docker.
github.com/MateusSousa00/sentiment-analysis30 min, no obligation. We map your project and I tell you honestly if I'm the right fit.
Scope, timeline, and price. Clear and written down.
Weekly updates, direct access to me, no middlemen.
Deployed, documented, yours.
Tell me what you're building.
I read every message myself and reply personally.
