Choose Your Level
Pick the difficulty that matches where you are. You can come back and try a harder level later.
Beginner
Optimize Sequential API Calls
Fix a dashboard that takes 10 seconds to load because it fetches data one by one.
1 to 2 hours 3 criteria
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Intermediate
Offload a Heavy Task to a Background Worker
Keep the main API thread unblocked when generating massive PDF reports.
2 to 4 hours 3 criteria
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Advanced
Design an Event-Driven Checkout Workflow
Architect a distributed transaction using the Saga pattern.
3 to 5 hours 3 criteria
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