AI Product Engineer · Full-Stack
Thiago Marinho
I build AI products that reach production and keep working. Agents, RAG, and full-stack engineering, end to end.
From problem to product in production
I work end to end: I find the problem, write the spec, and ship software that does the work.
AI agents
Agents that orchestrate tools and people, with control, observability, and safety in production.
RAG and semantic search
RAG pipelines from ingest to ranking: chunking, embeddings, vector DB, and evaluation.
Full-stack products
Complete Next.js apps: frontend, API, database, and deploy on Vercel.
Mobile apps
Store-ready React Native apps, with deep linking and a focus on retention.
Spec-driven engineering
Spec before code: less rework, more predictability, better quality.
Payments and fintech
Payment integrations (PIX, cards) and billing flows that hold up at scale.
Results I've shipped
- R$6M
- in revenue processed on an event platform
- 25%
- mobile drop-off reduction
- 60%
- faster SDK integration
- 99.9%
- on-chain indexer accuracy
- 50k+
- devs reached with technical content
- 12+
- years shipping software in production
Where I built this
Software Engineer · Popstand
Complete healthcare platform (API, web, and mobile) serving thousands of patients.
Full-Stack Developer · Unicrow
TypeScript SDK for Web3 escrow and a real-time on-chain indexer.
Dev & Tech Writer · Rocketseat
Technical content that reached more than 50,000 devs in the BR JS community.
Simple, direct, and in production
Discovery
I learn the problem, the user, and the expected outcome. I write the spec before I touch the code.
Build
I build in short cycles, with AI in the loop, tests, and visible progress at every step.
Ship & iterate
I ship to production, measure what matters, and iterate on real data.
What you need to know
What do you build?+
AI products end to end: agents, RAG pipelines, and full-stack apps with Next.js and TypeScript, from the first spec to production.
Are you available for freelance or contract work?+
Yes. I take on projects, senior/lead roles, and consulting. The fastest way to reach me is the contact form or email.
What is your main stack?+
Next.js, React, React Native, TypeScript, and Node.js, with LLMs, RAG, and vector databases for the AI layer.
Do you work remotely?+
Yes. I've worked remotely with teams in the US, Switzerland, and Brazil for over a decade.
How do you charge?+
It depends on scope. Tell me what you need and I'll suggest the best format: fixed project, retainer, or hourly.
Have a project or role in mind?
Tell me what you need to build. I reply fast.