Build with AI tools and verify normal, boundary, and failure cases. Choose practice or a timed exam.
Level 2
Applied · State and workflows
Build with AI and verify your work. Practice real-world, algorithm and AI systems problems, then take a timed challenge.
AI Native record
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- Practice
Sales summary
Group paid orders and rank category totals.
Data processingLevel 260 min - Practice
Merge booking intervals
Merge overlapping or touching booking intervals.
AlgorithmsLevel 260 min - Practice
Rebuild task state
Rebuild the final task list from an action log.
BackendLevel 260 min - Practice
Schedule parallel jobs
Assign jobs to workers and calculate completion times.
ReliabilityLevel 260 min - Practice
Repair inventory reservations
Reject insufficient stock and invalid quantities while preserving stock and reservation consistency.
Bug repairLevel 260 min - Practice
Parse quoted CSV
Handle embedded commas, newlines and escaped quotes.
Data processingLevel 260 min - Practice
Deduplicate payment webhooks
Apply each event ID once and aggregate account balances.
BackendLevel 260 min - Practice
Evaluate access policies
Evaluate wildcard rules with deny overriding allow.
Security & accessLevel 260 min - Practice
Apply JSON merge patches
Merge nested objects, delete null fields and replace arrays.
BackendLevel 260 min - Practice
Roll up service telemetry
Bucket requests and aggregate errors and durations.
Data processingLevel 260 min