What is the ruling on the salary of an engineer who was accepted for a job based on ten years of experience mentioned in his CV, which is incorrect? And what should he do with his money if his salary is unlawful?

Whoever did that must repent, because he committed two major sins: lying and forgery. His salary is lawful if he performs his work well and the work itself is permissible, and it becomes unlawful if he does not perform the work well or if the work itself is prohibited.