Product engineer in Costa Rica. I build complete systems alone: Postgres schema, backend, frontend, infrastructure, deploy, interface and brand. No designer, no spec, no one handing me a Figma file.
reser.app — booking and WhatsApp automation for salons and barbershops. TypeScript, Next.js, Postgres, Stripe. Bookings serialize behind a Postgres advisory lock so two customers can never take the same slot, and Stripe webhook replays die on a unique index instead of charging twice.
cargity.com — multi-tenant container tracking for importers and freight forwarders. Twelve carriers behind one timeline, real sea routes computed offline against ~1,600 ports, and white-label public tracking pages a customer opens with no account. 58 tables, 176 row-level-security policies.
fantini.app (private) — the platform a furniture manufacturer runs on. About 30 modules, 197 endpoints, 75 tables, shipping continuously since 2023. Electronic invoicing to the national tax authority, ERP and route-optimization integrations, item-level RFID over USB readers, thermal label printing over raw TCP.
KARA (private) — restaurant operating system. Kitchen display, POS, waiter, host and admin: five surfaces over one schema and 162 tables, so the kitchen and the register can never disagree about an order.
f1.today — is there Formula 1 today? A yes or no in three seconds, with live session detection, a countdown, your own timezone and one-click calendar export. Astro 5 with Preact islands, no database and no runtime APIs.
vacancy.city — a live 3D map of Manhattan with all 44,795 buildings extruded from NYC Open Data, listings anchored to the building they are actually in.
Self-hosted LLMs on my own tailnet (Ollama, quantized Gemma and Qwen), measured for latency and throughput before picking one. n8n pipelines for scraping and retrieval, three of them published as MCP tools.
TypeScript · React · Next.js · Node · PostgreSQL · Supabase · Stripe · Astro · Three.js · Tailwind · Vercel · Cloudflare · Figma
Most of my work lives in private repositories. Happy to walk through any of it.
📍 San José, Costa Rica · LinkedIn · Buy me a coffee