Deliveroo Backend Engineer Interview Questions
The questions to prepare for a Deliveroo Backend Engineer interview. Questions from real interview reports rank first. Updated daily.
Parse inclusive cron day-of-week ranges, including wrap-around ranges such as 5-2.
DeliverooParse cron wildcards, ranges, and steps into expanded schedule fields and preserve the command.
DeliverooValidate a password by checking length, character classes, whitespace, and forbidden content in linear time.
DeliverooDesign an ML-assisted system that sells 6M burgers in 10 minutes while adapting demand and ensuring inventory is exhausted.
DeliverooDesign a focused Deliveroo ML backend feature while making justified assumptions and avoiding unnecessary complexity.
DeliverooProcess authentication operations in PostgreSQL and count tokens whose expiration time is still valid.
DeliverooCompare JUnit assertions with AssertJ and choose based on readability, diagnostics, dependency cost, and project consistency.
DeliverooTests when to centralize repeated literals, use typed values, or externalize configuration in a large Deliveroo backend.
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Implement PostgreSQL session generation, renewal, and active-session counting with expiry and revocation checks.
DeliverooRank restaurant launch-month cohorts by completed-order revenue across rolling 30-day windows.
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