How Meta's engineering team built the Forum app using AI-native development

Meta's engineering team details how they integrated AI agents as participants in the development process to build the independent Groups application Forum. They adopted a human-on-the-loop model and measured success based on production-grade output verified by tests. Within eight weeks, Forum achieved core functionality alignment with Facebook Groups. Autonomous stress testing cycles during development identified and fixed memory issues, reducing memory usage and page faults by approximately half. Post-launch, agents also assisted in root cause analysis of user feedback.