An HR screening call, followed by a call with the hiring manager to discuss background and skills.

Then, a technical interview that included both system design and a code question.

After that, you can also expect a technical interview with the hiring manager, an HR interview, and a management interview.

They described a scenario of people coming and going from some place. They asked me to represent this in code any way I want and then say which time had the most people.

System design - design a social network.

Focus on following a person, creating a post, and generating a feed (which is what they care about most).