Am I required to perform Hajj, knowing that my company's policy does not permit leave before completing one year, and I have only been working for three months?

If you have signed a contract with your employer and the Hajj season falls within the contract period, you are not permitted to perform Hajj without their permission, because they own your benefit during that period. In this case, you are excused if they do not grant you permission.

If you have not yet signed the contract, or if you fear losing your job after Hajj and you are in need of it, this is considered an excuse that permits delaying Hajj and makes you not able to perform it this year. This is because ability includes having continuous provision for yourself and your family after returning from Hajj.