Design a Developer-Friendly Comms API

Question

Design a clean, extensible REST API for a communications product. Anticipate how developers will debug, monitor, and fail over their usage.

What this round covers

• Resource modeling and versioning
• Error handling: actionable, discoverable error codes
• Idempotency keys for safe retries
• Pagination, rate-limit headers, webhooks

Tips

Show empathy for the developer experience: intuitive errors, clear docs, and safe retries.