Senior .NET Developer Interview Questions

Ready to find your next innovative Senior .NET Web Developer? These sample interview questions will help you find the right candidates during the interview process. Don’t forget to add questions specific to your company’s position requirements.

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Senior .NET Developer qualifications to look for 

A .NET developer is responsible for producing code using  .NET languages such as C# and VB. 

Senior .NET developers are savvy creators who design applications from scratch, configure existing systems and provide user support. A .NET developer thrives on teamwork and collaborates to design, develop and maintain software.

Keep an eye out for candidates who have:

  • A strong understanding of basic algorithmic concepts
  • Solid critical thinking skills 
  • A wider understanding of databases
  • A strong intellectual interest in application development

Top tip: Hire candidates willing to grow by making sure their personal career goals align with your company's mission.

Role-specific interview questions

  • Describe a use case and the benefits of a Reflection in .NET.
  • Describe a use case for the dynamic type in .NET.
  • Explain why a Lambda expression forms a closure.
  • Explain how anonymous classes instantiated in .NET. Can they be passed as function params?
  • Do you think it’s possible in .NET to extend a class (any class) with some extra methods? If yes, how can it be accomplished?
  • Describe the way attributes are used and a proper use case in.NET. 
  • Explain a Just in Time compiler. Do you know of any programming language runtimes that use one?
  • What are the key differences between the preemptive threading model and the cooperative threading model?
  • Explain how MSIL (intermediate language) fits into the whole .NET framework architecture.
  • Define polymorphism, inheritance, and encapsulation.
  • Describe a use case and the needed code modifications for the await keyword? 
  • How would you accomplish lazy initialization in .NET?
  • What is the “virtual” keyword?
  • In what case would you declare a field as volatile?
  • Explain the Entity Framework and its benefits.
  • Explain the difference between the IQueryable and IEnumerable interface in LINQ.
  • Describe the benefits of using the Aggregate method in LINQ.
  • What tools & practices are necessary for a Continuous Delivery solution?
  • What’s the relationship between a code point and a code unit in Unicode?
  • Explain the components of a quality unit test good. What about functional ones?

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