7 .NET Performance Interview Questions Senior Devs Actually Face (And How to Answer Them)

You’ve optimized production apps for years. Here’s how to talk about it in 45 minutes

“You’ve spent five years optimizing production .NET apps. You’ve reduced cloud costs by 40%. You’ve fixed memory leaks that took down prod. But now you’re sitting in an interview, and someone asks: ‘Explain how the GC works.”

Your mind goes blank!

Not because you don’t know — you literally fixed a gen2 GC issue last month — but because you’ve never had to EXPLAIN it out loud.

I call this a Senior Paradox — ‘We too busy doing the work to practice talking about it’

After viewing interviewed dozens of senior .NET developers and seen this pattern repeatedly. Brilliant engineers who can’t articulate what they do daily.

Here are the 7 performance questions that actually come up in senior .NET interviews — and how to answer them

THE 7 QUESTIONS

Question 1: “Explain a performance issue you diagnosed and fixed in production.”