🧠Forum, Meta’s new standalone Groups app, was built by a small team that brought an AI agent into the development cycle as a participant — planning, building, testing, and verifying.
Building Forum we moved from human-in-the-loop — engineer drives, AI assists inside each step — to human-on-the-loop, where the agent runs the iteration (plan, implement, build, test, correct, repeat) and the engineer sets the goal, watches the run, and owns the outcome.
The key decision: success wasn’t measured in code volume. It was measured in changes that build, pass tests, and survive review.
✅ Reached core feature parity with Facebook Groups in eight weeks
📈 An autonomous stress-testing loop caught a memory issue during development, roughly halving memory use and page faults
🔗 Read how our engineers went AI-native to build Forum:
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