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.

9 parts · ~70 min of reading, in order, nothing assumed.

Start with Part 1

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The .NET Developer Interview · Part 1

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

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

The .NET Developer Interview · Part 2

C# Language Questions: Fundamentals They Always Ask

The C# questions in every interview, answered with depth. Value vs reference types, string immutability, boxing, interfaces vs abstract classes and records. Aug 7, 2026 8 min read

The .NET Developer Interview · Part 3

async/await Interview Questions (the Deadlock Special)

Never fumble an async question again. Why async void is dangerous, how .Result deadlocks, Task vs Thread and cancellation, with traps you reproduce yourself. Aug 7, 2026 7 min read

The .NET Developer Interview · Part 4

Collections and LINQ Questions

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

The .NET Developer Interview · Part 5

ASP.NET Core and Web API Questions

The web questions in every .NET interview. The middleware pipeline, DI lifetimes, REST design and JWT auth, 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

The data-access questions that decide senior vs junior. Indexes, the N+1 problem, tracking vs no-tracking, transactions and joins. 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, out loud. Entities, APIs, caching, queues and scaling, reasoned the way a .NET interviewer wants to hear it. Aug 7, 2026 8 min read

The .NET Developer Interview · Part 8

Behavioral Questions, Salary Talk, and Closing Strong

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

The .NET Developer Interview · Part 9

EF Core Interview Questions: From DbContext to Production Migrations

EF Core interview questions with strong answers. DbContext lifetime, migrations, tracking, concurrency, transactions, raw SQL and fifteen rapid-fire questions. Oct 14, 2026 13 min read

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