Active
BrSuper Internet project
BrTools
The operations platform I created and maintain for an ISP, used by ~200 people. Includes BrTools AI, an agent the whole company uses from chat.
TypeScriptNestJSReactAI SDK+8
Mateus Felipe Full-stack developer
I like to build
platforms., AI agents., dev tools., ISP software., things in Rust., side projects.
Full-stack developer available for software development, DevOps, infrastructure, AI agents and consultancy. I build with TypeScript and Rust, and I've been living in Linux for about 10 years.
- Development
- DevOps & infra
- AI agents
Now At a glanceLast post
- 01Available for
- Freelance projects and consulting
- 02Role
- Full-stack developer at an ISP with 60,000+ subscribers
- 03Building
- BrTools and BrTools AI
- 04Latest post
- Cron: o agendador de tarefas do Unix
- 05Stack
- TypeScript, Rust, Node.js, Python
- 06Linux
- ~10 years and counting, security & hardening
01Services
What I can
build for you.
I work with companies that need software built, infrastructure sorted out or AI put to real use. You talk directly to the person doing the work.
01
Software development
Web platforms, APIs and internal tools, from the first spec to production, with React, Next.js, NestJS and PostgreSQL.
I created the operations platform of an ISP with 60,000+ subscribers, used by ~200 people across five teams.
02
DevOps & infrastructure
Docker, CI/CD, blue/green deploys, Linux servers and AWS or Cloudflare setups, with traces, metrics and logs you can actually use.
I led a production switch from MariaDB to PostgreSQL with no downtime.
03
AI agent development
Agents that work inside your systems from a chat, limited to each user's permissions and asking for confirmation before they change data.
I built an AI agent now used across a whole company, an ISP with 60,000+ subscribers.
04
Consultancy
A second opinion on architecture, infrastructure, security hardening or where AI fits, plus a concrete plan your team can follow.
I've run discovery with five business areas, written the specs and prioritized the roadmap.
02Projects
Built, shipped,
still running.
Some of it running in production every day, some built just to learn something new. All of it shows how I work.
Active
Noisekun
A web app for mixing ambient sounds to relax or focus, with themes and a pomodoro timer. Open source, with 280+ stars on GitHub.
TypeScriptNext.jsVercel
Active
ASCII Tools
A zero-friction toolkit of in-browser dev utilities — encoders/decoders, hashing, JWT tools, password/UUID generators, a chmod calculator, and a cron editor, all client-side with no server round-trips.
TypeScriptReactTanStack StartBun+1
Active
Check DNS Block
Checks whether a list of domains/IPs is blocked on a given DNS server, by comparing its answers against a reference DNS server.
RustTypeScriptReact.jsTauri
03About
Full stack by day.
Root user by night.
Ten years of Linux, a soft spot for security and system hardening, and a habit of turning whatever I learn into something I can ship.
01
Build across the stack
React, Next.js and TanStack on the front, Node.js and NestJS on the back, with Rust and Python when the job calls for them.
02
Run what I ship
At an ISP with 60,000+ subscribers, I created and maintain the platform ~200 people work in, and the AI agent the whole company now uses.
03
Share what I learn
Blog posts, configs and experiments, written down as I go. Some of them spiral into the rabbit hole.
04Writing
Things I learned,
written down.
Notes, studies and thoughts on technology and beyond, from deep dives to quick notes I want to remember.
Article
Cron: o agendador de tarefas do Unix
O que é o cron, como funciona, como escrever expressões cron corretamente e os erros mais comuns de quem começa a usar.
cronunixlinux
Article
Kubernetes Full Course - Notes
Notes and snippets from the Kubernetes Full Course, with "TechWorld with Nana".
kubernetesdevopscourse
05Contact
Got a project
in mind?
Tell me what you're trying to build or fix. I'll tell you how I'd approach it and whether I'm the right person for it.