What is the ruling on taking a commission for brokering work, and is there a rule to differentiate it from bribery or gifts to employees, and does profit become unlawful if the project was obtained through a gift or a bribe?

It is not permissible for an employee who acts as an agent for a client to take a commission without the client's knowledge, because this is considered among the gifts given to workers, which are deemed as illicit gain and betrayal. If he takes it, it rightfully belongs to the client. However, if the employee requests it, or if it results in the giver obtaining something to which he is not entitled, then it is a prohibited bribe. What is forbidden to take is also forbidden to give. An exception to this is paying a bribe to obtain a right or repel an injustice; in such a case, the prohibition applies only to the recipient. As for an employee who is not considered an agent and whose job description does not include drawing up contracts, it is permissible for him to take a brokerage commission, and it is permissible for the company to pay it. The ruling on the project's profit follows the ruling on the work itself: if the company's work is permissible, then the profit is permissible, while the sin of bribery or the prohibited gift remains.