Facebook releases Safety Check crisis response tool for Workplace

What this post added

This post details the development of Safety Check for Workplace, an enterprise crisis response tool derived from Facebook's public Safety Check feature. Key technical contributions include migrating storage to TAO for scalability, implementing a custom access management module for enterprise privacy, developing a location parser to standardize company location data, utilizing asynchronous jobs for parallel employee location and notification, fanning out async jobs across batches for timely delivery, and using a queuing system for handling high volumes of responses while updating statuses in real-time via GraphQL subscriptions. The system leverages React, Relay, GraphQL, and Hack, and includes programmatic simulations for resiliency testing.