Choose Your Level
Pick the difficulty that matches where you are. You can come back and try a harder level later.
Beginner
Fix an N+1 Query Problem
Optimize a hidden loop that is crushing your database.
1 to 2 hours 3 criteria
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Intermediate
Implement Redis Caching
Speed up a slow 3rd-party API response using an in-memory cache.
2 to 3 hours 3 criteria
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Advanced
Profile and Fix a Memory Leak
Stop a Node.js server from continuously crashing out of memory.
3 to 5 hours 3 criteria
Start this level