Is it permissible for a company to pay a sum of money to an employee in another company after winning a tender, given that the employee is not in the department specialized in tenders, but he introduced the company to the head of the tenders department and might influence the decision?

An employee in a company is not entitled to take commission from the one who wins a tender. What then of a person who played a suspicious role in the tender? If he caused the tender to be awarded to someone undeserving, he has committed a sin. If, in addition, he took a commission, it is a forbidden bribe.