Błażej Kustra

DevRel at Software Mansion, based in Kraków, Poland. After 6+ years of building mobile apps for clients, I moved into Developer Relations. Now I'm working on Argent, using what I learned about what makes dev tools great (and what makes them painful) to help make it the best place to build mobile apps.

I maintain open source libraries with over 1,000 stars on GitHub, ran a workshop on universal apps at App.js Conf, and build my own products like CookinBuddy. Lately I'm deep into agentic engineering: using AI agents to ship faster without cutting corners.

If you want to talk mobile apps, dev tools, open source, or something you're building, get in touch.

Projects

Posts

  1. The Gauntlet Loop Rebuilt a Game I Loved as a Kid
  2. Prompts Shouldn’t Be Tested by Eye. Here’s How to Measure Them Properly
  3. What I Learned Running 3 Claude Agents in Parallel for a Week
  4. Onboarding in React Native Doesn’t Have to Be Hard
  5. See all →