Interview Q&A

Master technical and career interviews with structured answers—short definition, real examples, pitfalls, and how to answer in 60–90 seconds.

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Senior PDF
Explain a real-world usage of Resource Filters in microservices.

Short answer: Caching expensive requests where model binding is unnecessary. Real-world example (ShopNest) A ShopNest ValidateModelAttribute runs before actions and returns 400 if ModelState is invalid—same rule for ever…

ASP.NET Core Read answer
Senior PDF
Performance tuning: caching (in memory, distributed), response?

Short answer: compression In-memory caching stores data on server memory for fast retrieval. Distributed caching uses external stores (Redis, SQL) for multiple servers. Response compression reduces payload size using gzi…

ASP.NET Core Read answer
Senior PDF
Distributed caching / session state?

Short answer: Use Redis or SQL Server for distributed cache/session in multi-server environments. Helps maintain session state without sticky sessions. Real-world example (ShopNest) ShopNest registers AppDbContext as Sco…

ASP.NET Core Read answer
Senior PDF
Dependency inversion, SOLID principles in ASP.NET Core?

Short answer: Apply Dependency Inversion Principle by coding against abstractions (interfaces), not implementations. Follow SOLID principles: Single Responsibility: Each class has one reason to change. Open/Closed: Class…

ASP.NET Core Read answer

ASP.NET Core ASP.NET Core Tutorial · ASP.NET Core

Short answer: Caching expensive requests where model binding is unnecessary.

Real-world example (ShopNest)

A ShopNest ValidateModelAttribute runs before actions and returns 400 if ModelState is invalid—same rule for every controller.

Say this in the interview

  1. Define — one clear sentence (the short answer above).
  2. Example — relate it to a project like ShopNest or your real work.
  3. Trade-off — when you would not use it.
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ASP.NET Core ASP.NET Core Tutorial · ASP.NET Core

Short answer: compression In-memory caching stores data on server memory for fast retrieval. Distributed caching uses external stores (Redis, SQL) for multiple servers. Response compression reduces payload size using gzip, Brotli middleware.

Real-world example (ShopNest)

ShopNest registers AppDbContext as Scoped and IMemoryCache as Singleton. Putting DbContext in a Singleton causes threading bugs.

Say this in the interview

  1. Define — one clear sentence (the short answer above).
  2. Example — relate it to a project like ShopNest or your real work.
  3. Trade-off — when you would not use it.
Permalink & share

ASP.NET Core ASP.NET Core Tutorial · ASP.NET Core

Short answer: Use Redis or SQL Server for distributed cache/session in multi-server environments. Helps maintain session state without sticky sessions.

Real-world example (ShopNest)

ShopNest registers AppDbContext as Scoped and IMemoryCache as Singleton. Putting DbContext in a Singleton causes threading bugs.

Say this in the interview

  1. Define — one clear sentence (the short answer above).
  2. Example — relate it to a project like ShopNest or your real work.
  3. Trade-off — when you would not use it.
Permalink & share

ASP.NET Core ASP.NET Core Tutorial · ASP.NET Core

Short answer: Apply Dependency Inversion Principle by coding against abstractions (interfaces), not implementations. Follow SOLID principles: Single Responsibility: Each class has one reason to change. Open/Closed: Classes open for extension, closed for modification. Liskov Substitution: Subtypes can replace base types. Interface Segregation: Use multiple specific interfaces. Dependency Inversion: Depend on abstractions.

Real-world example (ShopNest)

A ShopNest checkout request flows through middleware, hits a minimal API or controller, uses scoped services, and returns ProblemDetails on errors.

Say this in the interview

  1. Define — one clear sentence (the short answer above).
  2. Example — relate it to a project like ShopNest or your real work.
  3. Trade-off — when you would not use it.
Permalink & share
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