Interview process very quick. They got in touch to arrange an assessment centre for the following week. Assessment centre included 20 people interviewing for 3 positions, plus internal candidates. Very long winded. Introduction, 1 hour group task, 1 hour individual task and 1 hour interview. Found out the outcome within 5 days but they were unable to offer any feedback or reasons for being unsuccessful. I requested feedback and have since been waiting 2 weeks for it, with nobody getting in touch despite having sent them a follow up email. Really unprofessional experience and a waste of an afternoon.