Projects
Things I've built
Open source projects, products, and experiments.
33 JavaScript Concepts
33 JavaScript concepts every developer should know. 66K+ stars and translated into 40+ languages by the community. Recognized by GitHub as a top open-source project of 2018.
Spaceship
Sole engineer on the domain search platform for four and a half years — helped sell 3M+ domains. Real-time WebSocket pricing across 500+ TLDs, Beast Mode bulk search, multi-currency engine across 30+ currencies.
Shopwyse
Multi-tenant retail ERP. POS/checkout, inventory, CRM, and financial reporting. Built with TanStack Start, React 19, Elysia, Drizzle ORM, and PostgreSQL.
Polyglot
AI writing assistant that interviews you first, then drafts content in your voice from different angles. Full-stack TypeScript.
Otis Finance
Stock market API for real-time prices, SEC filings, earnings, and financials.
gone
Fast, concurrent dead link detector. Interactive terminal UI, auto-fix for redirects, and output formats for CI/CD pipelines. Written in Go.
betterhook
Git hooks manager built for parallel AI coding agent workflows. DAG-based scheduling, content-addressable cache, and streaming output via Tokio. Written in Rust.
rust-skills
179 rules that AI coding agents can use when writing Rust. A collection of best practices for AI-assisted Rust development.
leonardomso.com
This portfolio website. Built with Next.js 16, Tailwind CSS v4, and deployed on Vercel.