Landing a job as a .NET Developer requires more than just knowing how to write C# code. Companies look for well-rounded candidates who understand the full .NET ecosystem, follow best practices, and can solve real-world problems.
In this guide, we’ll walk through key areas you should focus on to prepare for a successful .NET developer interview—whether you’re aiming for a junior, mid-level, or senior position.
1. Master the Core: C# and .NET Fundamentals
Make sure your fundamentals are strong. Be comfortable with:
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Object-Oriented Programming (OOP)
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Data types, LINQ, delegates, events
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Asynchronous programming (async/await)
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Exception handling and memory management
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Collections and generics
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Understanding .NET CLI and project structure
You should be able to explain your thought process and write clean, testable code.
2. Understand ASP.NET and Web Technologies
If you’re applying for a web-focused role, be ready for questions about:
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ASP.NET Core MVC and Web API
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Routing, middleware, dependency injection
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RESTful service principles
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Authentication and authorization (JWT, OAuth)
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Razor pages and/or Blazor basics
Bonus points if you’ve used Swagger, SignalR, or have built microservices.
3. Be Fluent with Entity Framework
Interviewers often ask about data access, so make sure you understand:
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EF Core basics and DbContext usage
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Code First vs Database First
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LINQ queries
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Migrations and seeding
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Lazy vs eager loading
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Repository and Unit of Work patterns
4. Know Your Tools and Ecosystem
Familiarize yourself with:
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Visual Studio / VS Code
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NuGet package management
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Git and version control workflows
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Azure basics (App Service, Azure SQL, etc.)
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Unit testing with xUnit, NUnit or MSTest
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CI/CD pipelines (GitHub Actions, Azure DevOps)
5. Prepare for Technical and Behavioral Questions
Be ready for:
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Algorithm and problem-solving questions (often in C#)
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Design questions like SOLID principles, clean architecture, and dependency injection
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System design at a high level for mid/senior roles
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Behavioral questions like:
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“Describe a challenge you faced in a recent project.”
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“How do you handle technical debt?”
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“How do you stay up to date with new technologies?”
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6. Build a Strong Portfolio and GitHub
Have at least 1-2 projects you can talk about confidently. Bonus if they:
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Are hosted live (e.g., on Azure or Render)
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Use clean code and best practices
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Include documentation and test coverage
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Are on GitHub with frequent commits
Final Thoughts
Preparing for a .NET developer interview is about balancing theory and practical experience. Focus on what the role requires, revise your fundamentals, practice coding, and don’t forget to showcase your communication and problem-solving skills.
With the right preparation, you’ll walk into your interview with confidence and clarity.
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