I was contacted by a Spotify recruiter.

The interview consisted of the following steps:

• HR screening with a few basic Android questions.
• Skype 1:1 interview with an Android engineer. This interview included more in-depth Android questions, a coding challenge, and a code review task. The coding challenge was to implement a timer in 20 minutes, with the ability to start and stop the counter and save its state on configuration changes/activity restarts. After this interview, I received detailed feedback and was invited to the onsite interview.
• Onsite interview: Three interviews (plus lunch, which I'm not sure was taken into account as an interview).
  • The first was a cultural interview with the hiring manager and the PO, where I discussed my work at my current company and asked questions about the Spotify development process.
  • The second interview was problem-solving, and I had to solve a medium-difficulty matrix problem.
  • The third and last was a "Show & Tell": I had to bring a project, explain some architectural decisions, and discuss testing choices.

Overall, the process was nice, and the HR team was very effective and detailed in their feedback.

• Activity and Fragment lifecycle
• Services types
• SOLID principles
• Design patterns (GOF and MVP)