Drills

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System designHard~20 min

Design a reliable third-party integration sync

Designs synchronization with an external system using cursors, retries, idempotency, rate limits, and reconciliation.

.NETApplication InsightsASP.NET CoreAzure Service BusSQL Server

Practice drill

System designHard

~20 min

Design a webhook ingestion system

Designs authenticated, replay-resistant webhook intake with durable acknowledgement, idempotent asynchronous processing, ordering policy, and reconciliation.

.NETApplication InsightsASP.NET CoreAzure Service BusSQL Server

Practice drill

System designHard~20 min

Design subscription entitlements and access

Designs plan entitlements, provider webhooks, idempotent billing updates, access checks, grace periods, and support overrides.

.NETApplication InsightsASP.NET CoreAzure Service BusSQL Server

Practice drill

Coding problemHard~35 min

Ingest a webhook safely and idempotently

Verifies the exact request bytes, rejects stale signatures, deduplicates event ids, and queues processing durably.

.NETASP.NET CoreC#EF Core

Practice drill