System Design

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System Design A2

REST API Design Best Practices I Use Every Day

A good API is easy to use and hard to use wrong. These are the REST API design rules I follow every day as a backend developer: names, status codes, errors, pagination, versioning and safe retries.

Oct 20, 2026 8 min read

System Design A2

Use an Idempotency-Key for HTTP Requests

When you build an API, one important question is: **What happens if the same request is sent twice?** Sometimes, nothing bad happens. But sometimes, sending the same request twice can create duplicate data or perform the same operation twice.

Aug 29, 2026 5 min read