A corporate job interview could be anywhere in the spectrum from all HR type stuff to all technical stuff, depending on the coporate culture and who you're meeting with.
If you are only meeting with the Chief Pilot (Aircraft Mgr, Flight Dept. Mgr are other similar titles) typical questioons would be "What is your background, why coporate, why us, tell us about yourself, can you be flexible, are you a team player, if we spend a bunch of money on you to train you, are you going to run off to Yooo-nited airlines, can we be sure you will pass training and will you be open to flying here using our SOP's").
If you are also meeting the owners, they may have some other questions, but probably just want to know that they will feel comfortable with you as one of the pilots- show some confidence, smile, show some teeth,
let them know you believe in the safe, comfortable and efficient operation of their aircraft.
Don't forget to ask some questions of your own- it's expected that as a professional, you will want to know the details of the position. What kind of training can you expect? What kind of schedule? Benefits, health insurance, etc. What about upgrades- how long has it taken historically?
How long has the flight department been in existence? What is its role in the company? What are future plans for equipment? Is the aircraft currently listed for sale (don't laugh, you might be surprised by the answer) ? What kind of assurances do you have that the operation will continue, etc.
Good luck- let us know how it goes.