I applied online. The process took 4 months. I interviewed at Culham Centre for Fusion Energy (London, England) in Oct 2021
Interview
Applied online and had an interview scheduled via skype/Teamviewer. First-round was basically 20 min vetting of the CV by discussing the CV you submitted.
The second round was much longer, with a 1 min presentation followed by 45 interviews on both technical and personality-based questions.