Technical interview questions and drills

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Showing the Backend System Design Foundation curriculum. Technology tags describe each drill's actual implementation context; shared drills can belong to more than one track.

Architecture scenarioHard~12 min

Design an idempotent POST endpoint

Makes POST retries return one durable business outcome by combining scoped keys, request identity, atomic ownership, response replay, and reconciliation.

In Backend System Design FoundationShared across 4 tracks

Drills

Design an idempotent POST endpoint

Design a notification system for a .NET backend

Design a public partner API

Design a reliable third-party integration sync

Design a safe soft-delete strategy in EF Core APIs

Design a saga and compensating workflow

Design a secure file upload and download backend

Design a validation strategy for ASP.NET Core APIs

Design a webhook ingestion system

Design bulk import preview and validation

Design comments, mentions, and threaded discussion

Design content approval and publishing

Design data partitioning and sharding

Design data retention and deletion workflows

Design moderation and reporting

Design notification preferences and digests

Design pagination, filtering, and sorting for an API

Design rate limiting and abuse protection for a public API

Design RBAC and resource ownership for a backend API

Design read scaling with replicas and replication lag

Design real-time live updates

Design recurring background jobs in a backend system

Design request and response boundaries for API compatibility

Design request DTOs for API boundaries