# Renan Winter Spatin (Renan Spatin)

> Software Architect, Tech Lead and Bachelor of Laws. Builds systems from scratch in any stack, with applied AI, for any field. 7+ years shipping distributed systems, combining legal and financial precision with high-scale engineering. Bachelor of Laws. Based in Juiz de Fora, Brazil (GMT-3); works remotely worldwide, in Portuguese and English.

Renan Winter Spatin builds custom software and applied-AI systems for any field - products from scratch, internal platforms, automation. Law background brings rigor on rules, processes and trust. Core stack: .NET / C#, Azure, AWS, distributed systems, and LLM/RAG integrations. Currently Technical Lead & Software Engineer at Transfero; previously BTG Pactual and Thomson Reuters.

## Consulting services

- **Building from scratch:** discovery, architecture, web/mobile/API development and deploy - from idea to a system in production, in any stack.
- **Architecture and technical leadership:** technical diagnostic, architecture review, roadmap, build vs. buy and team mentoring.
- **Applied AI:** LLMs, agents and RAG wherever there is repetitive work, documents and rules - with precision and controlled cost.

Engagement models: fixed-price project, hourly for one-off needs, or monthly retainer. First call is 30 minutes, free, no strings attached. Remote by default (GMT-3), occasional in-person work in São Paulo.

## Key pages

- [Home](https://renanspatin.com): overview and positioning.
- [About](https://renanspatin.com/en/about): full bio, background, and philosophy.
- [Consulting](https://renanspatin.com/en/consulting): services, process, FAQ, and how to engage.
- [Projects](https://renanspatin.com/en/projects): case studies with architecture decisions.
- [Blog](https://renanspatin.com/en/blog): essays on systemic efficiency and AI-first engineering.
- [Contact](https://renanspatin.com/en/contact): start a conversation.
- [Resume (PDF)](https://renanspatin.com/resume.pdf)

Portuguese (pt-BR) is the default language and lives at the root:
- [Início](https://renanspatin.com) · [Sobre](https://renanspatin.com/sobre) · [Consultoria](https://renanspatin.com/consultoria) · [Projetos](https://renanspatin.com/projetos) · [Blog](https://renanspatin.com/blog) · [Contato](https://renanspatin.com/contato) · [Currículo (PDF)](https://renanspatin.com/curriculo.pdf)

## Selected projects

- [Comunidade Católica Exaltai](https://renanspatin.com/en/projects/comexaltai) (comexaltai.com, 2024) - A Catholic community I belong to, serving in the communications ministry. I built the platform as a volunteer: web, hybrid mobile app and custom backend. Daily liturgy, events, content editor and members area - technology in service of faith and community. Stack: React 19, Vite, TypeScript, Tailwind CSS, Capacitor, .NET 9 / C#, ASP.NET Core, EF Core, PostgreSQL.
- [Gokai](https://renanspatin.com/en/projects/gokai) (gokai.ong, 2024) - A non-profit sports association where I serve as vice-president. I built the platform as a volunteer: serverless Next.js on Supabase, no custom backend - lean architecture so it costs the association almost nothing. Stack: Next.js 16, React 19, TypeScript, Tailwind CSS v4, Supabase SSR, shadcn/ui, Zod, React Hook Form.
- [AAPI-SJ](https://renanspatin.com/en/projects/aapi-sj) (aapi-sj, 2026) - Associação de Apoio à Primeira Infância e Obras Sociais São José (Juiz de Fora, Brazil), a Catholic institution serving many families. I'm building the institutional site and news admin entirely as a volunteer - I'm not a member; it's a way to help those who help. Stack: Next.js 16, React 19, TypeScript, Tailwind CSS v4, Drizzle ORM, PostgreSQL, Auth.js, Railway.

## Writing

- [Systemic efficiency: software should be as solid as a well-drafted contract](https://renanspatin.com/en/blog/eficiencia-sistemica) - The thesis behind my work: treat systems like contracts - anticipating failure modes, eliminating ambiguity, and removing friction at the level that matters, not the cheapest one.
- [Eficiência sistêmica: software deveria ser tão sólido quanto um contrato bem redigido](https://renanspatin.com/blog/eficiencia-sistemica) (pt-BR) - A tese que orienta meu trabalho: tratar sistemas como contratos - antecipando modos de falha, eliminando ambiguidade e removendo fricção no nível certo, não no mais barato.

## Contact

- Email: rwspatin@gmail.com
- LinkedIn: https://www.linkedin.com/in/renan-spatin/
- GitHub: https://github.com/rwspatin
- Location: Juiz de Fora, Brasil (available remotely worldwide)

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