SIMPSEN
Built at WeaveHacks 3: Self-Improving Agents Hackathon with Weights & Biases · Jan 31, 2026 · San Francisco, CA

SIMPSEN is an autonomous software engine that builds and improves products without human developers. Give it a mission, roadmap, and a CEO personality. The CEO agent plans features and prioritizes work, then spins up dev agents in Vercel Sandboxes to write code, pass type checks/tests, and open PRs. A testing bot powered by Browserbase catches issues and feeds them back into the loop. A real-time dashboard shows live stats and a knowledge graph of your product’s evolution.