ADP Backend Engineer interview experience

I didn’t write code at all; instead, the interviewer fired off rapid, conversational questions about core web and Java concepts—things like how APIs and HTTP methods work, and then Java fundamentals such as singleton, extends vs implements, and even connection pooling.

The questions moved quickly, but the interviewer was clearly trying to see whether my thinking was clear and consistent, not whether I could memorize terms. I remember feeling like I had to explain in a straightforward way and justify my understanding as I went. The difficulty felt “average” overall, but the speed of the