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Bazel

Bazel (Google-originated, OSS) is a hermetic, content-addressed, multi-language build system designed for large monorepos. Key properties: declarative build graph; content-hash-based caching (concepts/content-addressed-caching); remote build execution (concepts/remote-build-execution); hermetic builds (concepts/hermetic-build) for reproducibility.

Stub page — expand on future Bazel-internals sources.

As a service-definition authoring surface

Beyond its primary role as a build system, Bazel's configuration language is a reasonable authoring surface for service definitions — Figma (2024) uses a per-service Bazel configuration file as the single source of truth from which CI generates Kubernetes YAMLs (see patterns/single-source-service-definition).

Seen in

• sources/2024-08-08-figma-migrated-onto-k8s-in-less-than-12-months — Bazel config as the single authoring surface for EKS service definitions; CI generates YAMLs from it.
• sources/2024-12-16-canva-faster-ci-builds — Bazel remote-cache adopted for local C++ builds (>2 min savings on cache hits); remote-build-execution context.