I had two phone interviews.

After the first phone interview with the recruiter, I was told that I would be given a list of technical questions and a few days before scheduling an on-site interview.

A day after, I received an email asking for another phone call with the hiring manager this time. My expectation was a more technical background check.

The hiring manager jumped into some very basic technical questions right after introducing himself. He was not convinced with any of my answers, as he was looking to hear the answers he had in his mind.

The weirdest part about this interview was that he expected to hear his answers in 2 minutes! You cannot evaluate a person's technical skills over the phone by asking basic questions and expecting answers in 2 minutes.

The same questions are asked to everyone. You will find examples on Glassdoor.

What is the difference between a mean and median filter?

If you apply a moving average filter to a signal, what would happen to the signal's standard deviation?

What is the difference between logistic regression and a single-layer, single-unit neural network?

What is the difference between FIR and IIR filters?