Hi TTF,
While poorly placed to talk about the recruitment process (sorry), from within the industry there is a certain level of head scratching as to what THC are up to.
Undoubtedly well financed, they seem to be working on a 'build it and they will come' mentality with their aircraft orders. They are very much currently focused on the domestic side in KSA and have no plans to get involved in oil and gas which is the main use of commercial aircraft in Saudi. There is a thought that with KSA opening up under the direction of the Crown Prince MBS, THC's role will be to facilitate the move to being more like the UAE with VIP tourists and attractions. They are also likely to win utility work with NEOM, the new development KSA is hoping to build as a 'city of the future'.
If you are able to ask them questions at the interview (rather than them just asking you), I would focus heavily on what exactly do they foresee you doing on a daily basis as from the outside, ordering a whole heap of aircraft with no work for them seems a bit of an expensive folly. Pilots with nothing to do tend to get bored quickly so while it might be lucrative in the short term, unless there are some ideas about how much you will fly it might not be the best opportunity depending on what you want to do.