Tejas Kumar will teach you to build AI agents you can trust

I'm Tejas Kumar, an AI Engineer at IBM in Berlin, where we build agents and retrieval systems that large companies run on private data. I wrote Fluent React for O'Reilly, a best selling book on how React works inside, and I host the ConTejas Code podcast.

I've given 80 recorded talks at 64 events since 2012. My AI Engineer Europe 2026 talk on agent harnesses has over 275,000 views, and I teach the same material to engineering teams in private workshops.

I teach the way I build: start from something that fails, fix it one layer at a time, and explain why each fix works. You leave with working code and the judgment to use it on your own agents.