Product engineer in Tijuana, MX. I build 0-to-1 products, then measure whether the architecture actually pays for itself.
- frameshi — cinematic product videos filmed from your live product, not a rebuilt demo. We wrote our own rendering engine: it takes ownership of Chromium's clock, so the same screenplay produces byte-identical frames on every run.
- Habitae — PropTech for independent real-estate agents in Mexico: agentes.habitae.mx for agents, habitae.mx for buyers, one backend underneath.
- PostHog Code — measured performance contributions to PostHog's agentic coding app.
- Streamed markdown rendering: killed an O(n²) re-parse on every token — up to 17× less render CPU on long replies. Writeup →
- Sidebar re-renders during streamed agent replies: 20 → 0. Writeup →
- Habitae's maps layer: $680/mo vendor bill → $0, map-first discovery intact.
- frameshi cloud renders: 1440p60 at ~$0.04 per video on Cloudflare Workers + Containers.
I document what I build, with evidence, at karloaldrete.xyz.