Design a webhook delivery system: retries, ordering, and debugging your customers can do themselves.
You control the sender; thousands of customer endpoints you've never seen control your fate. The rubric hides in three places: what 'ordering' really costs, why retries need the receiver's cooperation, and the debugging surface most designs forget.
Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.
You control the sender; thousands of customer endpoints you've never seen control your fate. The rubric hides in three places: what 'ordering' really costs, why retries need the receiver's cooperation, and the debugging surface most designs forget.
Lead with where the obvious approach breaks, because that is the judgment they are screening for — most candidates jump straight to the happy path and lose the room.
Then walk the failure back through the pipeline in order, naming the one metric the customer's exec sponsor actually cares about before you propose the fix.
