Service
REST, GraphQL, gRPC. Typed contracts, generated SDKs, OpenAPI docs.

Production-grade APIs: spec-first, typed, observable, versioned.
Spec-first, codegen, contract tests.
Schema stitching, persisted queries, batching.
Protobuf, streaming, multi-language clients.
TypeScript, Python, Go from one source of truth.
Token rotation, scopes, audience binding.
Per-key budgets, abuse detection, full audit log.