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
CAR-L or STAR tecnique for interview was prefered, but still manageable. Interview was online with two people and lasted for about 30-40 minutes. They asked about my motivation and previous project experiences.