Optimizing Checkout APIs: Decoupling Non-Critical Latency
_jaydeepkarale · x · 2026-08-29
A classic backend system design interview scenario: the current Checkout API synchronously executes email sending and analytics updates, taking 800ms combined, though these are not required for the user to confirm payment success.
Optimization Strategy:
- Decouple email sending and analytics updates from the main synchronous flow.
- Utilize asynchronous message queues (e.g., Kafka, RabbitMQ) or background jobs to handle these non-critical tasks.
- Return the success response immediately after payment is processed, significantly improving API latency and user experience.
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