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
• 02

  02Last-Mile Slot Scheduler

  Delivery slot scheduler (key=value manifests)

  C++EasyBug fix60 min
• 06

  06Parcel Shipping Cost Calculator

  Parcel shipping cost calculator (rate card, volumetric weight)

  C++EasyBug fix60 min

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• 07

  07Service Latency Log Analyzer

  Service latency log analyzer (percentiles, error rates)

  C++MediumBug fix60 min

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• 11

  11API Gateway Rate Limiter

  API gateway rate limiter (token buckets, request log CSV)

  C++EasyBug fix60 min
• 12

  12Review Moderation Rules

  Product review moderation rules (review export, word lists, queue)

  C++EasyBug fix60 min
• 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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