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.

• 23

  23Price Drop Alert API

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

  Java · Spring BootEasyBug fix60 min
• 24

  24Review Helpfulness Votes API

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

  Java · Spring BootEasyFeature60 min