I applied online and after a few days, I received an e-mail from the recruiter to schedule a Skype interview. The interview was about 20 minutes and asked about my latest experiences. After that, I had a one-hour interview with a software engineer. He asked general questions about data structures (e.g., the difference between an array and a list, how a hashmap works, etc.). Finally, he gave me one easy problem to solve on a shared screen. I answered most questions well and solved the problem, but I received a rejection with the feedback that "I am not yet at the level required on the Computer Science side." I have to mention that I have a PhD in Computer Science. They don't seem to care about your studies or experience, just about answering questions perfectly.

What is the difference between an array and a list? Operations time.