Technical interview questions and drills

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

Comparison questionMedium~7 min

When do you use IDisposable instead of a finalizer in .NET?

Distinguishes deterministic cleanup from finalization and explains resource ownership in normal application code.

In .NET BackendShared across 3 tracks

Drills

When do you use IDisposable instead of a finalizer in .NET?

When is IAsyncDisposable useful in .NET?

When would you host a .NET API on App Service, AKS, or Azure Functions?

When would you stream data instead of loading it all into memory?

When would you use minimal APIs in ASP.NET Core?

When would you use Span, Memory, or ArrayPool in .NET?

Which memory metrics would you monitor for a .NET service?

Why avoid returning EF entities directly from APIs?

Why can large allocations hurt a .NET application?

Why does middleware ordering matter in ASP.NET Core?

Why is an unbounded in-memory cache risky?

Why is it risky for a singleton to capture scoped services or request data?

Why mutable structs and defensive copies are surprising

Why should an App Service-hosted API be stateless across instances?