What is the ruling on receiving personal commission and company commission for mediating between two parties in a tender, knowing that the mediator is not an agent for the winning foreign company, and that the commission was received after he had left his job at the company he used to manage?

If you participated in the tender process as a task assigned to you by your company, then your company is entitled to a known commission; otherwise, it is entitled to a commission of the like. You are not permitted to take a special commission without the company's permission; otherwise, it is a bribe. However, if you participated without your company's knowledge, exploiting its name, then you must repent and compensate the company for exploiting its name. You are entitled to the agreed-upon commission in return for your effort; otherwise, you are entitled to a commission of the like.