I applied online. The process took 3 months. I interviewed at MBDA (Bristol, England) in Feb 2019
Interview
The process requires a lot of time spent filling out the initial application form then several easy online tests. The assessment centre requires you to create a short presentation on a title they tell you about a few days before. A teamwork task was also completed as well as a 45 minute interview with a wide variety of questions including competency questions and questions on your CV.