Tilt is a local development orchestration tool for Kubernetes and Docker Compose microservice environments. The Go binary evaluates a Starlark-based Tiltfile, watches the filesystem, builds container images, applies changes to a cluster or docker-compose stack, streams logs, and presents state through both a terminal HUD and a React web UI. The architecture is a single CLI/daemon combining a controller-runtime-style apiserver with custom v1alpha1 resource types, a Redux-like central store with actions and reducers, engine subscribers that react to state changes, and reconcilers per resource type. Key entry points are cmd/tilt/main.go, internal/cli/* for command handling, internal/engine/upper.go for the main event loop, and internal/controllers/core/* for reconciliation. External dependencies include Docker daemons/buildx, Kubernetes API servers, docker-compose, git, and optional Tilt Cloud analytics/telemetry endpoints. The codebase is exceptionally large and well-tested, though it carries visible dual-paradigm debt: older store/engine patterns coexist with newer apiserver/controller patterns, and many feature flags are marked obsolete.