The .NET Developer Interview

Eight parts covering what .NET interviews actually ask — C# fundamentals, async, LINQ, ASP.NET Core, SQL and EF Core, system design, and the behavioral round — each question with an explained solution, something to try yourself, likely follow-ups, and the classic wrong answers to dodge.

8 parts · ~57 min of reading, in order, nothing assumed.

Start with Part 1

🎯 Interview prep hub

The .NET Developer Interview · Part 1

The .NET Developer Interview: What to Expect and How to Prepare

The shape of a .NET interview loop, the rapid-fire screening questions, and a prep plan that uses what you already know instead of cramming trivia. Aug 7, 2026 6 min read

The .NET Developer Interview · Part 2

C# Language Questions: Fundamentals They Always Ask

Value vs reference types, string immutability, boxing, interfaces vs abstract classes, records — the C# questions in every interview, with answers that show depth. Aug 7, 2026 8 min read

The .NET Developer Interview · Part 3

async/await Interview Questions (the Deadlock Special)

Why async void is dangerous, how .Result deadlocks, Task vs Thread, cancellation — reproduce the classic traps yourself and never fumble an async question again. Aug 7, 2026 7 min read

The .NET Developer Interview · Part 4

Collections and LINQ Questions

List vs Dictionary vs HashSet, IEnumerable vs IQueryable, deferred execution traps and yield — the data-wrangling questions .NET interviews love. Aug 7, 2026 7 min read

The .NET Developer Interview · Part 5

ASP.NET Core and Web API Questions

The middleware pipeline, DI lifetimes, REST design and JWT auth — the web questions in every .NET interview, each with an explained answer and follow-ups. Aug 7, 2026 8 min read

The .NET Developer Interview · Part 6

SQL and EF Core Questions

Indexes, the N+1 problem, tracking vs no-tracking, transactions and joins — the data-access questions that decide senior-vs-junior impressions. Aug 7, 2026 7 min read

The .NET Developer Interview · Part 7

System Design Questions for .NET Developers

Design an appointment system end to end — entities, APIs, caching, queues and scaling — the way a .NET interviewer wants to hear it reasoned aloud. Aug 7, 2026 8 min read

The .NET Developer Interview · Part 8

Behavioral Questions, Salary Talk, and Closing Strong

STAR stories that don't sound rehearsed, the bug story every interviewer asks for, smart questions to ask them, and salary negotiation basics. Aug 7, 2026 6 min read