GitFarm: Git® as a Service for Large-Scale Monorepos

This post details the architecture and implementation of GitFarm, Uber's Git-as-a-Service platform. It introduces the GitFarm Gateway for authentication, authorization, and load balancing, and the GitFarm Backend for request processing, including repository synchronization and sandbox management. Key innovations include a pooling model for pre-warmed repository checkouts and sandbox containers to reduce latency to under a second, and a bidirectional gRPC streaming API for multi-command workflows. The system also employs specialized clusters for workload isolation to prevent noisy neighbor effects.