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.

• 01

  01Returns Eligibility Service

  Return-policy rule engine + JSON parser

  C++MediumBug fix60 min
• 05

  05Pickup Locker Network

  Pickup locker network (implement assign)

  C++MediumFeature60 min
• 07

  07Service Latency Log Analyzer

  Service latency log analyzer (percentiles, error rates)

  C++MediumBug fix60 min

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• 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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• 17

  17Driver Shift Planner

  Driver shift planner (implement chooseDriver; rest rule, daily max)

  C++MediumFeature60 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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