Hi!
My name is Baltazar

Fullstack engineer from Uruguay. I started in frontend, grew into backend work in production, and build my own products with AI coding agents, keeping the specs, review and validation in my hands.

Professional experience

VAIRIX Fullstack Engineer October 2022 - June 2026 3 years 9 months

VAIRIX — Fullstack Engineer

October 2022 - June 2026 · 3 years 9 months

Joined as a React Developer and grew into owning features across the stack for US clients. On Darwin Evolution, a multi-company traceability platform, I led the frontend work for Vairix (React, Vite, Ant Design), built a Next.js data-capture app from scratch and, from mid 2025, took on backend work in NestJS and PostgreSQL, setting up and testing the dev, QA and UAT environments with DevOps. On Seekr I worked on the Next.js frontends of their AI news and podcast products, and in 2026 on their model fine-tuning platform, where I took on a deployment and authentication problem in a part of the system that was new to me. I work with coding agents: I write the specs, review and validate.
Frontend foundation

React
Next.js
TypeScript
Tailwind.css
Platform & delivery

Cypress
Git
Node.js
NestJS
Docker
Databases
Agent orchestration

OpenCode
Codex
Claude Code
Kilo Code

Portfolio v2

This very site, rebuilt from scratch. It ended up becoming a small design system with its own blog and a warm light theme, built with Astro and Svelte.
Devtter

Functional Twitter clone made with Next.js.
Chattio

Messaging app I built to learn about real-time interaction, user authentication, and cloud storage.
Country Quiz

Quiz game I built to practice Redux Toolkit and thunks.
GIFFI

GIF search engine built with React. It helped me learn about routing, infinite scrolling, context, and other library patterns.
Avostore

Store app where I learned about Next.js, React Context, and the TypeScript ecosystem.
Glacssify

Small project I built to practice styled-components and play with glassmorphism effects. It lets you generate the style and copy the CSS.
Pokedux

Project made to learn Redux and it's lifecycle using Redux Toolkit
BOLT

Weather app to check the forecast from almost anywhere in the world. It was one of my first projects for learning the basics of React.
LOL Profile

Project built to apply async concepts and DOM manipulation using the League of Legends API.
Simon says

The classic Simon Says game, built with plain JavaScript.