They used a set of questions provided by HR to determine how you thought through a problem
Principal Software Engineer Interview Questions
10,176 principal software engineer interview questions shared by candidates
All of the questions were simple behavioral questions (such as Give an example of a time when X, or What did you do in Y situation, etc), so there really weren't any particularly difficult or off-the-wall questions. Maybe the most thought-provoking question was (paraphrasing): Describe a time when you developed an alternative course of action to solve a problem or to take advantage of an opportunity, and what were your decision criteria?
Describe a difficult problem that you troubleshot. Describe a time when you had difficulty getting a PR out.
What would you say to persuade a client about using this option?
What interests you about this position?
What kind of development process do you follow?
Delete a node in a singly linked list
Tell me about a time you dealt with a difficult teacher.
How is success measured in your position?
Why leave an excellent job (that I had while interviewing) in order to interview for a similar B&W job.
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