Most .NET developers don't fail interviews because they aren't good enough.

They fail because nobody ever showed them the full map of what they are being measured against.

They learn whatever their current job needs, ship features for a few years, and assume that is enough.

Then they walk into a senior interview and get asked about things they have never had a reason to touch.

A senior interview covers a broad range of topics: the C# runtime, async, ASP .NET Core internals, EF Core, security, system design, and how you reason about trade-offs.

Miss a few of those areas, and a strong engineer can look unprepared.

The good news is that the surface is not infinite.

It is a known map, and you can cover it on purpose.

I have spent more than 13 years building production .NET systems, I am a Microsoft MVP, and I have helped tens of thousands of developers level up through my newsletter.

This is the exact roadmap I would follow today to pass a .NET interview at any level - and to keep advancing once you are…