Problems

Each problem is a small multi-file project with seeded bugs (or a missing feature), visible tests and hidden tests. Pick one, fix it, and submit. Problems marked Sign in need a free account.

• 10

  10Cart Promotion Pricing Engine

  Cart promotion pricing engine (implement price)

  Java · Spring BootMediumFeature60 min

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• 24

  24Review Helpfulness Votes API

  Review helpfulness votes REST API (implement rank; votes, burying, tie-breaks)

  Java · Spring BootEasyFeature60 min
• 27

  27Loyalty Points Ledger API

  Loyalty points ledger REST API (implement plan; expiring lots, FIFO redemptions, retries)

  Java · Spring BootMediumFeature60 min

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• 30

  30Refund Processing API

  Refund processing REST API (implement split; idempotency order, money parsing, window, reasons)

  Java · Spring BootHardFeature60 min

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