The first couple of interviews were a great experience and went nicely.

We were mainly talking about my interests, my career vision, and what I am looking for in a company.

However, the third interview was technical and focused mainly on old knowledge I had long forgotten due to my postgraduate studies.

At the end, they didn't take notice of whether the reviewers were fit for conducting the interview or the fact that such trivial skills, which faded over time, could be quickly resharpened. The position felt like it was fitting for BSc graduates.

They asked me to give the formula of a geometric series, without searching it online.