I had two interviews on Hangouts one day, and an extra interview a month later, also on Hangouts.

The first two were easy, though I didn't do them super well.

The third and last one was really hard; it was my hardest interview ever. They asked me a lot of questions about design and coding, most of them very difficult.

I was solving a problem involving some design patterns, specifically about a server receiving requests. Then, the interviewer changed the problem. Now, the server could handle multiple requests simultaneously, transforming it from a design problem into a concurrent programming challenge.