Hanko is a production-grade, self-hostable authentication and identity platform written primarily in Go. The backend exposes public, admin, and management HTTP APIs plus a CLI for migrations, user import/export, JWK/JWT management, and config schema generation. Authentication is implemented as a custom state-machine engine (flowpilot) driving login, registration, password/passkey/MFA/third-party OAuth/SAML flows, backed by JWT sessions, device trust, webhooks, audit logs, and rate limiting. The persistence layer uses gobuffalo/pop with a broad set of per-entity persister interfaces and roughly 65 Fizz migrations covering users, emails, credentials, sessions, tenants, organizations, roles, SAML providers, and webhooks. The frontend is split into a TypeScript SDK (`@teamhanko/hanko-frontend-sdk`) and Preact-based web components (`@teamhanko/hanko-elements`) that render flow states into embeddable `<hanko-auth>` and `<hanko-profile>` elements. The repository also contains a quickstart Go server, framework examples for React, Vue, Angular, Next.js, and Express, Playwright e2e tests, Docker Compose stacks, and Kubernetes manifests. Data flows through Echo routers into flowpilot actions/hooks, which validate inputs, persist state, issue sessions, and trigger webhook events; PostgreSQL, Redis, SMTP, and external OAuth/SAML providers are the primary external dependencies. Overall the codebase is well-structured and heavily tested, with sophisticated security handling around redirect validation, account linking, multi-tenant isolation, and webhook signing. The main friction points are the custom flowpilot framework's learning curve, a very large configuration surface, duplicated example code, and some stale example/e2e toolchains relative to the core Go and Node versions.