themanfromthatplace,
Called CTC. You can apply to Ryanair through their portal. But you must pay for and complete the CTC Airline Qualification Course (AQC) first - approx 10K.
Then they may put you forward for interview at Ryanair and a selection of other airlines. So it's slightly misleading to have a Ryanair application section of their website, because effectively it's just an application for their AQC programme.