Dir of Product at Iron (acquired by MoonPay), in Berlin. I build the tools I actually use.

Most of my building is a personal agent OS: a handful of agents on one small VPS that coach my Ironman training, file my voice notes, grow my knowledge base while I sleep, read me a podcast every morning, and text me when something breaks. It's been running unattended since early 2026.

• croissant-ride — my own indoor training app, cut to the essentials. ERG workouts, 3D worlds, .FIT to Intervals.icu or Strava. Runs in the browser at ride.arthurpfz.com.
• tri-coach — AI triathlon coach. Grades every workout against my fitness, writes next week's plan on Sunday. n8n + Claude + Intervals.icu.
• tricoach-db — 250 lines of Express over SQLite that replaced a $30/month Airtable base.
• vault-system-template — architecture for an Obsidian vault that ingests itself. Bots capture, agents query, it grows on a cron.
• text-polisher — system-wide hotkey that rewrites selected text via Claude. Select, press, done.
• PortfolioWebsite — arthurpfz.com, where I write the builds up. Astro + Tailwind on Netlify.

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