Based on the position you are applying for, sometimes behavior questions (prepare "stories" based on your experience), sometimes technical questions (get familiar with required skills). Get familiar with your CV and the job description and it should be fine. The interviewers are usually your future supervisors or your future team members. For me, the atmosphere is very friendly, lovely...

One panel interview. The overall interview was moderate level. Mostly asked the common interview questions after a brief explanation on team and possible tasks. The questions were: Why this team? What are my strengths and weaknesses Detail questions on Related experiences What are my hard skills Career goals