High Level Design Interview Questions & Answers with Nitesh Kesarkar

This PDF is a carefully curated .NET Interview Questions & Answers preparation guide designed for junior, mid-level, and senior backend developers.

It focuses on how interviewers expect you to understand .NET runtime internals, ASP.NET Core architecture, dependency injection, and production-grade backend development practices — not just write APIs.

What this PDF includes

• 250+ carefully curated .NET interview questions

• Core .NET and C# concepts with real behaviour explanations

• .NET runtime architecture and execution pipeline

• ASP.NET Core request lifecycle and middleware architecture

• Dependency injection and modular backend design

• Database integration with Entity Framework

• Authentication, authorization, and security practices

• Performance optimisation and production deployment strategies

• Common mistakes and interview traps

Topics covered

• .NET fundamentals and runtime architecture

• C# language concepts and object-oriented programming

• ASP.NET Core framework and application structure

• Middleware pipeline and request lifecycle

• Dependency injection and service architecture

• REST API design and backend best practices

• Entity Framework and database integration

• Authentication and security patterns

• Caching, performance optimisation, and scalability

• Testing with .NET testing frameworks

• Logging, monitoring, and debugging tools

• Production deployment and performance monitoring

Who this is for

• .NET developers at any level

• Backend engineers preparing for interviews

• Developers transitioning into ASP.NET Core development

• Engineers wanting deeper understanding of .NET internals

This is a PDF-only product, intended for personal use, and works well as a last-mile interview revision guide.