SYS/003 · 2025 / Active

Order pipeline

An e-commerce order through event choreography. No domain service calls another over HTTP.

Systems designFastAPINestJSRabbitMQPostgreSQLEvidence repository

FastAPI — order service
NestJS — supporting evidence, not the identity
RabbitMQ — event choreography
PostgreSQL — order state

Broker choreography
Compensation when stock fails
202 on create

E-commerce order by choreography. POST 202; correlation_id is order_id. Python leads; NestJS is supporting evidence. Compensation when stock fails after payment. Evidence repo: order-flow.

This system has a short technical note. The full study is Observa.

System index