The interview includes a free-form talk with the lead. You are expected to talk about your projects, skills, and motivation. The process can be daunting, but there is nothing to be scared about.
I applied online. The process took 2 weeks. I interviewed at Eesti Energia
Interview
They were very interested in my cover letter and asked many questions about it. The most important thing to them was willingness to learn and previous experience was not necessary.
Interview questions [1]
Question 1
Most questions were about the cover letter so very specific to it.