Product engineer from Wrocław, Poland. 15+ years of shipping software, the last nine in TypeScript, React and Node.js. I build things that both people and AI agents use.
- 🤖 Agents — built and shipped an MCP server from first merge to external users (OAuth with dynamic client registration for Claude and Codex); work daily with Claude Code and Codex under enforced rules, with evals and LLM-as-judge where quality matters
- 📬 AI-native products — took an AI-native email client (patriotmail.ai) from first commit to the App Store in four months
- ⏱️ Founding engineer of Sandtime, a time-tracking SaaS on eight platforms
- 📊 Product analytics — PostHog in every project, KPI dashboards people actually read
- ♿ UI craft — React since 2017, design systems, WCAG 2.2 AA behind automated checks, Playwright
| 👑 Korona Krulów | open-source satirical web game, 100,000+ players · koronakrulow.pl |
| 🗣️ Korpo Tłumacz | corporate-speak ⇄ plain Polish, several LLMs measured against a programmatic dictionary |
- 🌐 ciunkos.com
- 🐦 @Ciunkos on X
- 🧑💻 Older projects live on my other GitHub account: @Ciunkos