Designing Resilient Shopify Middleware

Short summary

Production Shopify middleware typically fails due to synchronous architecture—not exotic bugs. The solution: acknowledge webhooks in <200ms and process asynchronously, use idempotency keys with dedup tables, and separate concerns with the outbox pattern. Add circuit breakers, exponential backoff with jitter, and comprehensive observability to handle failures gracefully.

• •Avoid direct synchronous webhook → API → external system chains; acknowledge quickly and process asynchronously to prevent cascading failures
• •Use idempotency keys with dedup tables to safely retry events without duplicate processing, state corruption, or double-charges
• •Implement circuit breakers, exponential backoff with jitter, and the outbox pattern to ensure graceful degradation and internal consistency

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