Mateus Berlitz · Lead Full-Stack Engineer & PO

I build productspeople perceive as valuable.

1M+in annual recurring revenue on a SaaS built from scratch
8+years building software and products
7+critical integrations running in production
5+products conceived from scratch

How I work

Building products goes beyond writing code — it's delivering perceived value at every layer.

  • Scalability

    Architectures that grow with the business — from MVP to thousands of users without a rewrite.

  • Observability

    Metrics, logs and alerts to operate with confidence and find root causes before customers notice.

  • Concurrency

    Queues, messaging and multi-channel architectures that handle high volume without dropping events.

  • Product & UX

    Product thinking in the code: every feature starts from the user journey, not the ticket.

Projects

What I'm building right now

Two products of my own, from concept to code — with the same care I put into client products.

DevInSpace — An operations room for local AI-powered development
Open source · in progress

DevInSpace

An operations room for local AI-powered development

You decide what to do; it prepares the environment, executes with agents and only calls you when it needs you. Automatic worktrees, isolated previews and tasks orbiting by urgency.

  • Tauri
  • Rust
  • React
  • TypeScript
  • SQLite
Amoney — Personal finance made easy
Coming soon

Amoney

Personal finance made easy

Personal finance with AI and open finance: connected accounts, closely tracked goals and analysis that drives decisions — not decoration.

  • Bun
  • ElysiaJS
  • Next.js
  • PostgreSQL
My story

From the Brazilian countryside to seven-figure products

I grew up in Dois Irmãos, a small town in southern Brazil. At 17 I was already building websites at a local agency; at 19 I opened my own — and discovered what I really loved was turning code into business.

Since then: proprietary CMSs, financial systems, teams led and a SaaS that crossed $1M ARR. The constant: products are built on perceived value — and on people.

Mateus Berlitz walking through a field in the countryside of southern Brazil