Meet Maestro: How We Manage 21 Laravel Starter Kit Variants

Maestro is an internal orchestration tool built by the Laravel team to manage 21 starter kit variants across 8 repositories. Instead of manually propagating changes across every repo, Maestro uses a layered build system where shared, framework-specific, auth-specific, and feature-specific layers are composed into final runnable kits. Contributors work on a built variant in a single directory, and a watcher syncs changes back to the correct source layer using priority-based ownership logic. Placeholder restoration ensures framework-specific values don't leak into shared source files. The tool also provides CLI commands for linting, validation, and browser testing across the full matrix or a targeted subset, significantly reducing the cognitive overhead for contributors.