The process took 2 weeks. I interviewed at Vueling Airlines (Barcelona) in June 2019
Interview
First, they send you an exam. It is pretty difficult, it took me 2 days (although I had extra impediments like installing software). If they like the exam, they invite you to technical interview. Mostly those are the usual questions what have you done and what project you prefer
Interview questions [1]
Question 1
Exam: to write a Web API / webservice for a specific task (there can be a little recursive challenge in the task)