You need to submit your application from the website of MK, and then they will call you for a screening, it seems they have regular screenings during the year, but they are very selective, only the very braves get hired... (that's what I heard) recently they interviewed 15 FO in France and none got the job, and same thing with 40 spanish pilots. Wondering if they are that desperate for pilots. Also some friends told me that it was the worst experience he had, and he did many interviews in his career. So we'll see how it goes.