Architecting 21-Service E-commerce with Golang & DDD

Short summary

A detailed engineering breakdown of migrating an e-commerce monolith to 21+ microservices using Golang, Domain-Driven Design, and the Kratos framework. The article covers Saga orchestration via Dapr for distributed checkout, optimistic concurrency control to prevent inventory overselling under high load, and idempotency keys for at-least-once event delivery. Concrete code examples illustrate clean architecture layering, compensation logic for failed checkouts, and database-per-service isolation across five core domains.

• •21-service e-commerce architecture using Golang + Kratos with strict DDD bounded contexts and database-per-service isolation
• •Saga pattern via Dapr event mesh handles distributed checkout with compensation rollback for pricing or inventory failures
• •Optimistic concurrency control and idempotency keys prevent overselling and duplicate event processing under high throughput

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