I applied online. The process took 2 months. I interviewed at Atos (London, England) in Feb 2014
Interview
Applied online, got through the online tests and telephone interview. At the assessment centre, there was a group activity, where we had to work out a plan for relocating a company's office while making sure that their online services weren't disrupted. A group presentation at the end. Two assessors watched us interact the while time.
Then individual interviews. I had to interview two people, they were both based on competency questions, much like the telephone interview.
Then we were given an hour to prepare a presentation on a new organisational system to be presented at the end of the day to the assessor who was being the CEO of the company.
No Technical interview.
Interview questions [1]
Question 1
presentation to the CEO was limited to 5 minutes, where you had to cover different solutions, push for a solution that you would recommend and reason why (ROI, usability, cost, time), explain the cons and how you would overcome them, and then give a proposed schedule for the implementation.
Ran out of time and the feedback said that I was lacking on the ROI and other financial suggestions but since i was going for a technical role, they understood that I would have a more software engineering view so it was fine.