# João Lorenzo

> João Lorenzo is a full-stack and AI engineer based in Brazil (UTC-3). He designs, builds and runs production software end to end: data model, APIs, frontend, deploy pipeline and the LLM agents and RAG inside the product. He is Founder & Lead Engineer at Pyp System, a software studio, where he leads a team of five.

Key facts:
- Role: Founder & Lead Engineer, Pyp System (June 2024 to present). Previously Tech Lead & Full-Stack Developer at Growth 8, a startup accelerator (2023 to 2024), and Web Developer at Abase Sistemas (2022 to 2023).
- Main stack: TypeScript, Node.js, NestJS, Vue/Nuxt, React/Next.js, React Native, Python (FastAPI, LangGraph, LangChain), Go, PostgreSQL, Redis, BullMQ, Qdrant, Docker, GitHub Actions, nginx.
- AI engineering: LangGraph agents, agentic retrieval-augmented generation (RAG) on Qdrant, tool calling over the Model Context Protocol (MCP), fallback across OpenAI, Anthropic, Gemini and xAI, and per-tenant token metering.
- Way of working: spec-first and AI-native. Coding agents generate code and tests from the spec; he owns the architecture, code review and production quality.
- Production: zero-downtime blue-green deploys used by five production services, with production deploys several times a day.
- Languages: English (full professional proficiency) and Portuguese (native).
- Works remotely from Brazil, in English and Portuguese.

## Case studies

- [An omnichannel AI platform, from first commit to production](https://joaolorenzo.com/work/ai-platform): multi-tenant SaaS with a NestJS platform API, a Python/LangGraph agent engine and a Go WhatsApp gateway, built as a joint venture with a Brazilian cloud provider.
- [A travel marketplace, live on iOS and Android in four months](https://joaolorenzo.com/work/travel-marketplace): NestJS, Next.js and React Native marketplace with split payments, Airbnb and Booking.com calendar sync and an MCP server for AI agents.
- [Zero-downtime deploys, several times a day](https://joaolorenzo.com/work/zero-downtime-deploys): blue-green releases with Docker, GitHub Actions and nginx, with health gates and expand/contract migrations.

## Pages

- [About](https://joaolorenzo.com/about): background, principles, full experience, skills, education and languages.
- [Selected work](https://joaolorenzo.com/work): index of case studies.
- [Contact](https://joaolorenzo.com/contact): email, LinkedIn and GitHub.

## Em português (Brazilian Portuguese)

The whole site is also available in Brazilian Portuguese under /pt.

- [Início](https://joaolorenzo.com/pt)
- [Trabalhos](https://joaolorenzo.com/pt/work)
- [Sobre](https://joaolorenzo.com/pt/about)
- [Contato](https://joaolorenzo.com/pt/contact)

## Profiles

- [LinkedIn](https://www.linkedin.com/in/joaolorenz)
- [GitHub](https://github.com/joaolorenzo)
- Email: joaolorenzosds@gmail.com