Airlock – Facebook’s mobile A/B testing framework

This post introduces Airlock, Facebook's mobile A/B testing framework, developed in response to the loss of A/B testing capabilities after migrating to native iOS and Android app development. It details the challenges of implementing A/B testing in a native mobile environment, the design and implementation of Airlock from scratch, the critical importance of accurate exposure logging to avoid misleading data, and the scaling of the framework to support complex experiments and millions of users. Airlock significantly improved the speed and data-driven nature of mobile app development and iteration.