Interview discussion was Systematic and drilling. More focus on concepts. Difficulty level was medium. Interview process was day long with 5 different rounds. Each round focus on different areas.

It was worst interview experience I have ever had. Interview has 7 rounds spanning over 3 months. All rounds were in US time zone. After last round there was no communication for 3 weeks. I called for enquiry and was informed that they don't need a staff engineer now instead they need a lower rank role. Very unprofessional company. I will suggest never waste time by appearing interview for this unprofessional organisation