about
About Renan W. Spatin
Software architect and technology strategist with a background in law. I like building from scratch and making people's lives easier with technology - in any field, on any stack.
I'm a software architect and technology strategist with a law degree and 7+ years shipping systems that solve real problems.
I got into technology for a simple reason: it lets you build from scratch. Taking a dream off paper, turning an idea into a product and making life easier for the people who use it - that's what drives me.
I'm trained in software architecture and, with AI, the language became a detail: I pick the stack the problem calls for. I've worked at Transfero, BTG Pactual, Thomson Reuters and a UK fintech, and I run my own products in production.
Law gave me something engineering alone doesn't: the reading of rules, processes and responsibilities. It's what makes a system trustworthy - and what makes someone trustworthy to build it.
I'm driven by discipline and systemic thinking: a jiu-jitsu blue belt, an MBA in progress at FGV, and philosophy as a source of clarity to lead projects where technology is a means, not an end.
I'm a Roman Catholic, and part of what I build is service: the platform for Comunidade Católica Exaltai, where I serve in the communications ministry; the site for Gokai, a non-profit sports association where I'm vice-president; and the site for AAPI-SJ, a Catholic social work in Juiz de Fora helping many families. All volunteer - technology as a way to serve God and people.
Identity & Principles
My approach is defined by the intersection of three distinct worlds: the precision of Law, the resilience of Engineering, and the discipline of Martial Arts.
Engineering & Law
Law taught me to read rules, processes and responsibilities before writing the first line. That is what makes a system trustworthy - and what makes someone trustworthy to build it.
Discipline & Vigor
I've trained jiu-jitsu for years. The mat teaches what technical leadership demands daily: consistency, calm under pressure and respect for the process.
Faith & Purpose
I am a Roman Catholic. Faith shapes how I work and the decisions I make - without turning that into a sales pitch.
What people I've worked with say
Recommendations from leaders, peers and people I led, published on LinkedIn.
“I've had the pleasure of working closely with Renan for several years, from our time at BTG Pactual through to Transfero Group, and I can confidently say he is an outstanding professional. Renan is extremely meticulous, methodical, and focused, with a strong commitment to delivering high-quality work. He's someone you can trust in critical situations and complex environments.”
“A professional who combines technical depth with maturity in decision-making. As an architect, he has a very clear strategic vision, knowing how to define standards, guide technical decisions and ensure the healthy evolution of platforms over time. He leads the team with responsibility, clarity and empathy, encouraging good practices, autonomy and the professional growth of developers.”
“He acted as a team leader in an exemplary way, always helping the team, listening and giving the best advice and suggestions. He led a team of about 8 developers and 1 QA analyst, showing great team and project management skills - and in the middle of all that he also handled development (front and back) of several projects, on top of understanding their infrastructure.”
“One of the best .NET developers I have worked with. Renan is capable of leading projects, solving complex problems, and providing innovative and efficient solutions. He demonstrates a strong commitment to quality, always seeking ways to improve software efficiency and scalability.”
“He's always bringing technological innovation to the company; a professional who is always studying and expanding his technical knowledge. Works well in a team, communicates well, is resilient and stays focused on projects. At BTG, where we worked together, he delivered great value to the organization.”
“Renan excelled at identifying innovative solutions to the daily challenges we faced, always staying ahead of the curve. He was generous in sharing his knowledge, ensuring the whole team benefitted from his insights.”
“A result-driven T-shaped professional with outstanding context switching capabilities and a remarkable attention to detail. Greater than his focus is his kindness and willingness to do his best work lifting up others.”
“Renan is a professional of the highest technical quality, very dedicated and intelligent, and above all a friend. Always willing to collaborate and grow with the team. A standout wherever he goes.”
“A very committed professional, keeping all deliveries at a high quality level and supporting the whole team to reach expectations anytime they need - besides bringing them to an upper level.”
Off the keyboard
Off the keyboard: I train jiu-jitsu (blue belt), play guitar, and play tennis as an honest beginner. I'm a Roman Catholic.
Two cats at home. An NFC biochip I've had implanted in my hand for a few years (works better than you'd think). And photography when time allows - the photos end up at @rwinterlens.
Stack.
Technologies I use in production. .NET and cloud at the core; pragmatic on the rest.
Backend & APIs
Production services in C#/.NET, event-driven architecture, clean domain.
- C# / .NET (5–9)
- ASP.NET Core
- Node · Fastify
- Prisma
- Python
- Entity Framework Core
- Dapper
- REST
- gRPC
- Microservices
- Microkernel · adapters
- Clean Architecture
- Hexagonal Architecture
- DDD
- Event-Driven
- FluentValidation
- Serilog · structured logs
- Swagger / OpenAPI
Frontend & Mobile
Type-safe, fast, and hybrid mobile when it makes sense.
- React 19
- Next.js 16
- TypeScript
- Vite
- Tailwind CSS
- shadcn/ui
- Radix UI
- TanStack Query
- Zustand
- React Hook Form
- Zod
- Capacitor · hybrid mobile
Data & Infra
Multi-database, multi-cloud, container-first, real observability.
- Azure
- AWS
- Azure DevOps · CI/CD
- GitHub Actions
- Terraform · Helm
- Kubernetes
- ECS Fargate
- Docker
- PostgreSQL
- SQL Server
- MySQL
- CosmosDB
- DynamoDB
- Redis · cache + rate limit
- Elasticsearch · text search
- Azure Key Vault · secrets
- New Relic · observability
Messaging & Integrations
Kafka/RabbitMQ, payments, transactional email, and applied AI.
- Kafka · event streams
- RabbitMQ · workflows
- Azure Service Bus
- AWS SQS / SNS
- Stripe · billing
- Resend
- MailKit
- Google GenAI
- Claude
- Codex
- MCP servers
- Spec-first · agentes