They asked me about me background, project I have done, problems I have encountered etc.
They asked me how I would approach a few different problems (real problems I'd likely face in the job). They were mostly interested in my problem solving approach, breadth of knowledge, and some level of depth.
They asked me some CS fundamentals questions.
They asked me some networking fundamentals questions. (networking, web, etc.)
They asked me some infrastructure questions (DevOps, Docker, etc.)
Everything was relevant to the role, my background, or something I should have reasonably known.