I received an email with details about an interview over phone and the time. On the day of the interview, I got a call at precisely the time mentioned and the interview took place over the phone for about 30 minutes. Most of the questions were directed at my previous job. There were questions on why I chose renewable energy and how I handled problems. At the end (and this is where I think I should have prepared more), I was asked questions on SQL. These questions were pretty basic and mostly about what do SQL statements like "Join", "Null", "inner Join" mean. Overall, I would say that the interview was quite informal with average difficulty.