Levels within the Corruptors are based on secrecy, espionage ability and loyalty to vTx primarily. We also take into account several other factors to a lesser degree though.
We use a point-based system to keep track of the characters in-house level. Simply you gain enough points, you gain the level. If you lose a level somehow, you have to start at the beginning of the previous one. Leaving the clan and then returning will result in a first level character. The character restarts from scratch. Note that a character's recognition level has no bearing on their rank in the clan, we are skill based, not time based.
Note that we have had one corruptor removed from the group already for giving out their profession within the clan. This is a one shot deal people. If someone names your character as a corruptor, you're out. If this happens, your front profession will become your character's true profession. If you are an external corruptor (one who infiltrates other clans) when you are removed, you might as well stay with that clan. Secrecy is of the utmost priority.
Earning points is different per occupation. For the (class) they are accumulated as follows