The interview was in three stages.

Stage 1 was a HackerRank test. This should be simple enough, and if you aren't able to pass it, you have no business applying for a senior dev position.

Stage 2 was a take-home project where two choices were given. As another user described, the project was to be able to perform shallow and deep clones. It is a bit difficult but completely doable in the allotted time.

Stage 3 was an in-person interview. Everybody that day was very nice and courteous; however, the questions asked were rather specific and wouldn't really show how a developer is able to think. Questions regarding the names of built-in C# functions really have no place in a face-to-face interview:

a) because IntelliSense and Google exist, which can give you the answer you need under a minute in a practical scenario, and b) this doesn't show anything about the candidate's ability other than memorizing minutiae.

I would suggest asking questions along the lines of "How would you architect this?" or "How could you optimize that?" – questions that could show higher-level thinking and conceptualization.

Overall, the company atmosphere feels great, and the people were, for the most part, quite nice. A slight improvement of the interview questions, and it would be golden.

What is the most accurate way to check for equality by reference?