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4,347 principal engineer interview questions shared by candidates

Some questions was related to is it possible to create your own Marker interface, how to design frontend solution where the response is expected to return a static or Observable based on some criteria. When questioned about what is the criteria he himself was unsure about it. What happens if you don't specify Class firname("dbclass"). He expected what is happening inside that dbclass. It is better to attend this company for practice. The reviews on this company is pathetic. Have patience for being rejected without any clue
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Principal Engineer

Interviewed at Equiniti

3.7★
Apr 8, 2025

Some questions was related to is it possible to create your own Marker interface, how to design frontend solution where the response is expected to return a static or Observable based on some criteria. When questioned about what is the criteria he himself was unsure about it. What happens if you don't specify Class firname("dbclass"). He expected what is happening inside that dbclass. It is better to attend this company for practice. The reviews on this company is pathetic. Have patience for being rejected without any clue

Given a a roomba like vacuum with a limited APIs like turn left, turn right, go forward, clean, detect clean area, how would you ensure you have traversed and cleaned an entire room. Bonus: how would you optimize to save energy?
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Principal Software Engineer

Interviewed at FICO

3.8★
Nov 9, 2017

Given a a roomba like vacuum with a limited APIs like turn left, turn right, go forward, clean, detect clean area, how would you ensure you have traversed and cleaned an entire room. Bonus: how would you optimize to save energy?

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