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Mestre Fábio

I build AI products, from the database to the deploy.

Portrait of Fábio Berbert de Paula

Fábio Berbert de Paula, a.k.a. Mestre Fábio*

Senior software engineer: full stack, Linux and AWS. 26 years of experience, working remotely from Rio das Ostras, Brazil.

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Projects

Viva o Linux

Featured

Viva o Linux

The Portuguese-language Linux and open source community I founded in 2002, online for 24 years, with articles, tips, scripts, forum and news written by its users.

I still run it end to end: development, servers, SEO and moderation. I am modernizing the codebase to PHP 8.3 and Twig, with Meilisearch search, XSS and CSRF protection and an AI-assisted content pipeline. My own contributions: 149 articles, 530 tips, 67 scripts and nearly 2,000 forum posts.

  • PHP
  • MariaDB
  • Twig
  • Meilisearch
  • Nginx
  • Linux
Visit project: Viva o Linux

Featured

Friends Fighters

A 2D fighting game for Android that turns photos of your friends into paper puppet fighters. Snap a photo, tap the face, and your friend is ready to brawl.

Background removal runs on the phone itself (MediaPipe), with recorded voices for hits and knockouts, special moves, CPU opponents, three languages and a one-time purchase validated by its own back end. Published on Google Play.

  • Godot
  • GDScript
  • MediaPipe
  • Fastify
  • PostgreSQL
Visit project: Friends Fighters
Tô na Quadra

Tô na Quadra

01 · SaaS for sports arenas

SaaS for sports arenas to run rankings, tournaments, challenges and casual Plays in beach tennis, tennis, padel, pickleball, footvolley and volleyball. An AI assistant on WhatsApp checks games and standings, schedules matches and records results. Used by arenas in Nova Friburgo, Rio das Ostras and Búzios (RJ).

  • Node.js
  • Next.js
  • OpenAI
  • WhatsApp
  • Stripe
  • PWA
Visit project: Tô na Quadra
Monetal Secretária IA

Monetal Secretária IA

02 · AI receptionist for clinics

Virtual receptionist on WhatsApp for clinics: per-professional schedules, booking, rescheduling and cancellation in natural language by text or voice, appointment confirmations, feedback and return campaigns. Next.js console in PT, EN and ES, with human handoff and Stripe plans.

  • Node.js
  • Next.js
  • OpenAI
  • Gemini
  • ElevenLabs
  • Stripe
Visit project: Monetal Secretária IA
Rabugento Assistant

Rabugento Assistant

03 · personal assistant on WhatsApp

Personal assistant on WhatsApp for finances (including bill reading), reminders, shopping lists, tasks, a document vault and lookups, by text or voice, with a synced web dashboard.

  • Node.js
  • Express
  • MySQL
  • OpenAI
  • WhatsApp
  • React
Visit project: Rabugento Assistant
NBA Bet Agent

NBA Bet Agent

04 · NBA analysis agent

Agent that pulls the daily NBA slate and combines standings, injuries, rest, travel and live odds to project outcomes, with Shin de-vigging, fractional Kelly staking, CLV tracking and automatic bet settlement. Next.js dashboard in three languages.

  • Python
  • FastAPI
  • PostgreSQL
  • pandas
  • OpenAI
  • Next.js
Visit project: NBA Bet Agent
Automatizando.dev

Automatizando.dev

05 · home automation and AI

Content and product platform for home automation and AI: articles, forum, paid courses, videos, function-calling assistants, WhatsApp chatbots, payments and remote gate control.

  • Node.js
  • Express
  • Next.js
  • MariaDB
  • Redis
  • OpenAI
Visit project: Automatizando.dev

Talking Toy

06 · a plush toy that talks

A plush toy that talks with children: a battery-powered Echo Dot inside the toy, driven by a custom Alexa skill connected to a Node.js back end with generative AI. Parents set the name, personality, voice and interests through a web dashboard.

  • React
  • Node.js
  • OpenAI
  • Alexa Skills Kit
Visit project: Talking Toy

About

Full stack developer with 26 years of experience in software development, Linux server administration and cloud infrastructure. My recent work centers on generative AI products: tool-using agents, WhatsApp assistants, CRM automation and data analysis. I own products end to end, from database modeling to deployment, with CI/CD, automated tests and observability.

How I can help

  1. AI agents that query your data and act inside your systems (function calling and MCP).
  2. WhatsApp service with AI that books, answers, reminds and records, by text or voice.
  3. Custom web systems and CRMs, integrated with the tools your company already uses.
  4. Stable Linux and AWS infrastructure with automated deploys, tests and monitoring.

Open to remote positions as a Senior Software Engineer, Full Stack or Applied AI, and to project work. Get in touch

After hours

Experience

  1. Sep 2025 - Oct 2026

    AI Software Developer

    Wine · Remote

    Built Wine Communication Agent, an internal CRM platform that uses an LLM to generate personalized push and email messages. Created an MCP server over Amazon Redshift, CleverTap and PostgreSQL, a FastAPI back end with about 120 endpoints, async workers and a Next.js dashboard, with Grafana and Loki observability.

  2. Nov 2024 - Oct 2026

    Full Stack Developer

    Altarede · Nova Friburgo, Brazil (hybrid)

    Merged five separate systems into a single CRM (Hub Altarede) built on EspoCRM for a telecom provider, with 33 custom modules, integrations with OZMap, PRTG, IXC and SQL Server, real-time router monitoring and continuous deployment with GitLab CI.

  3. Jun 2024 - Present

    AWS Engineer

    Aivis Tecnologia · Remote

    Responsible for the architecture, configuration and maintenance of the Aivis system services and servers on Amazon AWS.

  4. Aug 2023 - Oct 2024

    Full Stack Engineer

    Automatizando.dev · Rio das Ostras, Brazil

    Own platform for content, courses and AI and home automation products.

  5. Nov 2002 - Present

    Founder and Full Stack Developer

    Viva o Linux

    Created and run the portal since 2002: development, servers, SEO and moderation. Leading the modernization of the legacy codebase to PHP 8.3, Twig and service/repository layers, with Meilisearch search, XSS and CSRF protection and an AI-assisted content pipeline.

  6. Jan 2001 - Dec 2004

    Back-end Developer and DevOps

    ISM (Internet provider) · Rio de Janeiro, Brazil

    Web systems development and Linux server administration for the provider.

  7. Jun 2000 - May 2001

    GNU/Linux Sysadmin

    Linux Solutions · Rio de Janeiro, Brazil

    Linux server administration and network services (web, email, DNS, firewall). I obtained my LPI certificate 6 months before graduating and got this job right away.

Skills

Build

  • TypeScript
  • JavaScript
  • Python
  • PHP
  • SQL
  • Shell Script
  • GDScript
  • Node.js
  • Express
  • Fastify
  • FastAPI
  • Django
  • EspoCRM
  • REST APIs
  • React
  • Next.js
  • Tailwind CSS
  • Radix UI
  • Framer Motion
  • PWA

Applied AI

  • OpenAI API
  • Function calling
  • MCP
  • LangChain
  • LangGraph
  • Google Gemini
  • ElevenLabs
  • Prompt engineering

Operate

  • Linux
  • AWS
  • Google Cloud
  • Azure
  • Docker
  • Nginx
  • GitHub Actions
  • GitLab CI
  • Grafana/Loki
  • PostgreSQL
  • MySQL/MariaDB
  • SQL Server
  • Amazon Redshift
  • Redis
  • Meilisearch
  • MongoDB
  • Jest
  • Playwright
  • pytest

Contact

Write to fabio@mestrefabio.com or use the form.

Tell me what you need, the deadline and where the system runs today. I reply personally.

Elsewhere