API Gateway Service

Design properties

• Protocol-specific parsing or instruction decoding.

• Data enrichment or analytics.

• Any domain business logic.

Non-responsibilities

• Authentication (API keys).

• Rate limits and quota enforcement.

• Request validation and parameter sanitation.

• Version-aware routing to internal services.

• Standardized response envelope and error formatting.

• Request identifier creation and propagation.

• Basic telemetry emission (timings, status codes, error codes).

Responsibilities

The API gateway is the public entry point for all HTTP and real-time traffic. It enforces platform-wide policies before any domain work happens.

• Stateless. No session state is stored in memory.

• Horizontally scalable. Add replicas behind a load balancer.

• Deterministic. Routing does not depend on mutable runtime state.

If you need consistent low-latency under load, keep requests small. Prefer batch endpoints, streams, or webhooks for high throughput.