🇺🇸 English · 🇧🇷 Português

Hi, I'm Javan Mateus Dhein Gregório 👋

Full Stack Developer · Node.js/TypeScript · DevOps · Applied AI
_{Rio Grande do Sul, Brazil (UTC-3) · Open to remote roles · Portuguese (native) · English (advanced) · Spanish (conversational)}

I'm a Full Stack Developer at SAUR Equipamentos S.A., an industrial equipment manufacturer in southern Brazil, where I work across the whole lifecycle: from legacy Progress OpenEdge ABL and PHP systems to modern apps in TypeScript, React and Next.js. I set up the company's self-hosted GitLab CI/CD, and today every SAUR web application ships through a pipeline. I also integrate AI into internal systems (Gemini, Vercel AI SDK, agents) and automate workflows with n8n.

Outside work, I run Andejo, a group travel app in production that I built on my own, and I'm learning Go by building an API gateway.

🛠️ Stack

Core

Also use

DevOps & AI

🚀 Projects

• 🧭 Andejo — Group travel app in production, built solo from scratch. Includes Jev, an AI assistant that helps plan the itinerary.
• 🚦 tollgate (work in progress) — API gateway in Go with per-IP token bucket rate limiting, reverse proxy and 429 responses with Retry-After. Next up: Redis-backed buckets, Docker, CI and Prometheus metrics.
• 📦 QR code warehouse addressing — Rust app that generates warehouse location labels.
• 🧩 OpenEdge ABL Formatter SA — ABL code formatter for VS Code.
• 🧩 Language MKQ — MKQ language support for VS Code.
• 🎵 Spotify Lyrics Overlay — Chrome extension that shows synced lyrics over the player.
• 🛡️ WhatsApp Spam Detector and ✂️ Crop-Image — smaller everyday tools.

🌍 Open Source

• uutils/coreutils #14508 — merged contribution to cksum (the Rust rewrite of GNU coreutils).
• MDN Web Docs #45710 — documentation for the HTTP QUERY method.

🎓 Education

• Associate degree in Internet Systems — IFFar (in progress)
• Mechatronics Technician
• Expert in Industry 4.0 — RWTH Aachen University (2024)