Weights & Biases Co-Founder Shawn Lewis built a programming agent that topped the SWE-Bench leaderboard for months. In this talk, Shawn talks about his process, what he’s learned building agent experimentation loops, and how he is bringing those lessons into his work at Weights & Biases. In this presentation from Fully Connected 2025, Shawn also covers the acceleration of AI as viewed through programming agents and level sets on AI agents: explaining the nomenclature, evals, and experimentation.