It was mainly focused upon my resume and I had been asked about my previous projects (work-Ex), responsibilities. I had been asked to walk them through resume and the interviewer asked questions in between while I was explaining my projects. It was more design decisions oriented.

Interviewer asked rapid-fire fundamentals (APIs, HTTP methods, Java concepts like singleton, extends vs implements, connection pooling) to check if you actually understand what you're doing. Conversational, no coding. He was testing clarity of thought, not memorization.