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.

• 02

  02Last-Mile Slot Scheduler

  Delivery slot scheduler (key=value manifests)

  C++EasyBug fix60 min
• 03

  03Fulfillment Inventory Reservation API

  Inventory reservation REST API (CSV stock load)

  Java · Spring BootEasyBug fix60 min
• 06

  06Parcel Shipping Cost Calculator

  Parcel shipping cost calculator (rate card, volumetric weight)

  C++EasyBug fix60 min

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• 08

  08Checkout Coupon Service

  Checkout coupon REST API (quote, redeem, limits)

  Java · Spring BootEasyBug 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
• 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