I went through two rounds of interviewing, by my recruitment agent and then by the manager of my department.
Wasn't too lengthy and was always informed on what the next step was.
A couple of months after I expressed my interest I received an email from the Learning & Development team asking if I was keen to interview for a Graduate position in the Energy team. After accepting the invitation, I had an interview with the Exploration Manager, Senior Geophysicist, and the Senior Learning & Development Advisor. The interview process started with an overview of the company's objectives and activities, followed by a friendly conversation of my experience, the company's expectations and a both-side Q&A. My interviewers made me feel comfortable at all times and I can say it was a stress-free process.