Hi, I’m Robson Calixto

Head of Technology Harness Engineer Vibe coding São Paulo

I run engineering at 4Tech, where we build complex software for healthcare and other regulated industries.

This blog is where I think out loud: architecture decisions, AI systems, leadership, and the lessons from shipping products that actually run in production. Not demos. Not theory for its own sake.

The Code Agent That Improves With Every Run

Reading the AHE paper forced me to rethink where agent improvement really happens. The largest gains did not come from better prompts. They came from memory, tools, and middleware. Here is what that means for real engineering teams.