AI product engineer. I design and ship products, mostly built with coding agents.
Founding Engineer at PEXX (stablecoin payments and banking). Since 2021 I've run an independent consultancy, Kast Productions, doing product work for startups, agencies, and enterprises: Trustpilot, Irish Life, An Post, Volkswagen, Bidfood, RNHB, and more.
How I work: agent-driven development end to end. Codebases structured for agent navigation (CONTEXT.md and AGENTS.md discipline), custom skills for repeatable workflows, and multiple models across Claude and GPT.
🌐 kastproductions.com · 💼 LinkedIn · 📫 hello@kastproductions.com
Apps I build and run.
🗣️ immero - voice-first language learning: real-time speaking practice with an AI tutor that adapts to how you learn, with spaced-repetition memory. Next.js, Convex, Gemini Live [private]
🏠 sipit.homes - design homes built from SIPs: a 3D floor-plan editor with live bill of quantities and heat-loss estimates [private]
⚡ baltic-power - live electricity prices for the Baltics · code
Open-source tools and the consultancy site.
📄 twpdf - Tailwind HTML to PDF. My CV is rendered with it · code
🏋️ fabb - auto-books my gym classes: two-week timetable, standing rules, day-before cron. A companion skill runs it from a coding agent · code
📐 kastproductions.com - the consultancy site: Next.js static export, shadcn/ui on Tailwind v4 · code
Also in the lab: real-money algorithmic trading experiments on Polymarket and Kalshi.
Client work lives on client infrastructure. This is the personal slice.