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API Design Interview Questions & Practice

One API to design end to end — resources, versioning, auth.

One extended conversation around a single scenario, not a series of short questions — expect to go deep on 2-3 areas the interviewer picks based on what you say, rather than covering many topics shallowly. This runs longer than the question-based tracks.

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Sample API Design scenarios

  • Design a REST API for a hotel booking system — searching availability, creating reservations, and cancellations.

  • Design an API for a food delivery app — restaurants, menus, orders, and real-time order status.

  • Design an API for a task/project management tool like Trello or Asana.

  • Design an API for a social media platform's posts and comments feature.

These are a few examples — the real scenario for your session is chosen at random from a larger pool, matched to your chosen difficulty.

Frequently asked questions

Is API Design five separate questions like the other tracks?
No — API Design practice is one extended conversation around a single scenario, going deep on 2-3 areas rather than covering many questions shallowly. Expect this to run longer than the question-based tracks.
Can I choose the difficulty?
Yes — easy, medium, or hard, chosen right before you start. It changes how aggressively the interviewer probes and how strictly it scores your reasoning.
Is it free?
Yes — every account gets 5 interviews a month, any track, for free. Pro upgrades to unlimited interviews for $99/month.

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