I was contacted by a recruiter within two weeks from Spotify in NYC. The recruiter was very unprofessional, as he would not respond to my responses. A few months later, I was contacted by another recruiter and the process was smooth from there. An initial phone call with this new recruiter, followed by a purely technical discussion on security mechanisms and approaches.

Initially there is a multiple choice test which consists of standard questions about security. After that there is a call where the recruiter asks the typical questions about biggest failures, strengths etc.