Meta Deploys JiTTesting LLM Bug-Catching System to Production
JiTTesting shifts test generation from pre-planned suites to on-demand tests written exactly when a risky diff appears, with humans confirming rather than authoring. Engineering teams running large monorepos can study Meta's human-on-the-loop design as a template for adding LLM-generated checks without letting unreviewed code gate merges. The paper gives concrete deployment lessons rather than a lab-only prototype.