Kestrel, Identity, and SQL Server

ASP.NET Core interview questions that predict production fit

Stackologists scores ASP.NET Core interview questions against the Kestrel or IIS host you run, the Identity scheme on the wire, and the SQL Server path that broke last — not against Controllers attribute trivia.

Public .NET quiz decks reward routing attributes. Stackologists wants a named OpenAPI surface other teams version, a middleware pipeline that survived a real incident, claims that matched the calling UI, and a query plan story with numbers. That is the gate before anyone is introduced for a .NET seat.

Quiz decks that waste a Microsoft cycle

• Controllers attributes with no Kestrel, IIS, or container host named.
• No question about authentication middleware order or CORS placement.
• Identity skipped as if cookies and JWT schemes were interchangeable slogans.
• SQL Server treated as “the database” with no index, EF, or timeout story.

Someone can recite attribute routing and still stall sprint one on auth or deadlocks. Vague Microsoft-estate answers stop the Stackologists match.

ASP.NET Core interview questions Stackologists asks

Host and OpenAPI map

• Which ASP.NET Core API or MVC app did you operate — Kestrel, IIS, or container — and who versioned against its OpenAPI?
• Controllers or minimal APIs — what forced that shape on the Microsoft estate?
• What changed in that surface after the last production incident?

Middleware pipeline

• Place authentication, authorization, CORS, and exception handling in the order you shipped.
• What broke when that order was wrong?
• Which middleware stayed out of the public edge on purpose?

Identity and claims

• Cookie or JWT — and how claims lined up with the UI that called the API?
• What stayed out of the public contract so callers could not abuse it?
• How did a breaking Identity change get communicated to consuming teams?

SQL Server under load

• Which index or query plan moved first when callers stacked up?
• Entity Framework or raw ADO.NET on the hot path — and why?
• Which timeout or retry shipped after the last spike?

How Stackologists runs the Microsoft API screen

1. 1. Write the Kestrel host and OpenAPI surface

   Stackologists names the IIS or container host, the Controllers or minimal-API map, and the SQL Server database before résumés open. A bare “.NET” line is not a surface.

2. 2. Reorder the middleware pipeline out loud

   Ask the candidate to place authentication, authorization, CORS, and exception handling in the pipeline they shipped — and what broke when that order was wrong.

3. 3. Trace claims through Identity

   Cookie or JWT schemes, how claims reach the UI that calls the API, and what stayed out of the public OpenAPI document on purpose.

4. 4. Replay a SQL Server hot path under load

   Which index or query plan moved first, which timeout shipped after the spike, and whether Entity Framework or raw ADO.NET owned that path.

5. 5. Separate Framework desktop history from Core

   WinForms or Framework-only shops are a different seat. This scorecard is for ASP.NET Core APIs and MVC already on the production host.

Answers that fail a .NET placement

• “.NET” with no host, OpenAPI map, or SQL Server database named.
• Tutorial Controllers only — never a billed Microsoft estate.
• No story for middleware order, Identity claims, or a measured load incident.
• WinForms or Framework-only history sold as ASP.NET Core production.

Stackologists will not force a .NET hire past those gaps. An empty Microsoft seat beats a bad placement. Dotnet interview questions and asp net core interview questions consolidate here.

After the scorecard

Need capacity on the Microsoft estate? Hire .NET developers on the stack leaf. Scoring a Blazor UI seat instead? Use the Blazor interview questions note — that rubric owns SignalR circuits and WebAssembly payloads, not Kestrel middleware.

Hire .NET developersBlazor interview questions