I applied online. The process took 5 months. I interviewed at European Commission (Brüssel)
Interview
Hiring process involved an in-depth application form. Once I passed the initial stage of selection, I contacted the HR managers and connections within my desired units to express my interest. This was following advice from several people who work for the European Commission. There was no interview.
I applied through other source. The process took 2 weeks. I interviewed at European Commission
Interview
First I was contacted by the administrative assistant and asked if I was interested in the traineeship and if I had any difficulties with the starting date.
Then I received another call a few days after in which they asked me to reconfirm my interest, tested my language skills and motivation and then offered the position. I asked for a few days which were kindly given to me, then I confirmed.