Inlang is a localization platform that treats translation as code, storing messages in a versioned Lix database managed through Git. The monorepo includes a TypeScript SDK for loading, querying, and exporting translation projects; a CLI for running checks and machine translation; a plugin system for integrating with multiple message formats (JSON, ICU, i18next, Android XML, Apple xcstrings, and more); and Lit-based web components for editing translations in-browser. The SDK provides a rich data model (bundles, messages, variants with selectors) and a checks engine for detecting missing translations, unused messages, and plural errors. Architecturally, the repo is organized as a pnpm/Nx monorepo. The core `@inlang/sdk` package manages project lifecycle and database operations via Kysely. Plugins conform to a uniform `importFiles/exportFiles` interface and are loaded dynamically. The CLI uses Commander and Consola, while the UI components use Lit with Shoelace design tokens. The companion website (TanStack Start) serves documentation, a marketplace registry, and SEO-optimized pages. The system is designed to run in Node.js (CLI) and browsers (editor), with a focus on preserving file formatting through careful diffing and merging during export. Notable craftsmanship includes the `keepUnchangedJsonEntries` utility for byte-identical file preservation, the `EchoTracker` for optimistic UI state, the `pluralExamples` helper for locale-aware examples, and the `human-id` word lists for generating readable identifiers. These components are self-contained, well-tested, and reusable outside the localization domain. The codebase demonstrates strong engineering practices with extensive test coverage (vitest, Storybook, fuzzing) and compatibility tests ensuring backward compatibility across SDK versions.