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.

• 13

  13Putaway Bin Allocator

  Warehouse putaway bin allocator (best fit, zone usage)

  C++EasyBug fix60 min
• 15

  15Return Routing Engine

  Return routing engine (restock/vendor/liquidation/disposal, warehouse choice, batch retries)

  C++MediumBug fix60 min

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• 16

  16Catalog Cache Service

  Catalog LRU/TTL cache (read-through service, TTL policy, metrics)

  C++MediumBug fix60 min

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• 18

  18Fast Delivery Eligibility Checker

  Fast-delivery eligibility checker (JSON feed, longest-prefix regions, cutoffs, carts)

  C++MediumBug fix60 min

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• 19

  19Return Fraud Risk Scoring

  Return-fraud risk scoring (dates, weighted factors, tier share, retries)

  C++HardBug fix60 min

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• 21

  21Gift Card Wallet API

  Gift card wallet REST API (codes, ownership, expiry, idempotent redemptions)

  Java · Spring BootEasyBug fix60 min
• 22

  22Dock Appointment Booking API

  Dock appointment booking REST API (door choice, half-open slots, validation)

  Java · Spring BootEasyBug fix60 min
• 23

  23Price Drop Alert API

  Price-drop alert REST API (alert limits, CSV price feed, triggers)

  Java · Spring BootEasyBug fix60 min
• 25

  25Return Authorization API

  Return authorization (RMA) REST API (policy windows, restocking fees, lifecycle, ownership)

  Java · Spring BootMediumBug fix60 min

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• 26

  26Shipment Tracking Events API

  Shipment tracking events REST API (pipe feed, duplicates, out-of-order scans, late flag)

  Java · Spring BootMediumBug fix60 min

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