Amazon Senior Software Engineer interview questions

Majority of questions were behavioral, like "Tell me when you increased efficiency of the system", "Tell me when you took an unpopular decision and how you convinced others", "Give me an example of when you solved a complex problem with a simple solution", "What was your most challenging project". Surprisingly, some questions were repeated by different interviewers. The rest were technical questions.

contacted by their recruiter and applied online. was scheduled a online test which consists of 3 questions required to be done in 90 minutes. finish the test about 1 week ago but got no feedback, think I failed.