Is it permissible for me to appoint two engineers to a struggling company in exchange for half of the profits resulting from their appointment, while bearing the full loss, and is that considered gambling?

It is permissible to lease out a private employee to someone other than the original hirer for the same wage, more, or less, provided the wage is known. This is because linking it to an unknown profit invalidates the contract.

To finalize the aforementioned contract, the wage must be determined at the time of the agreement. It is permissible to agree with the company that you will undertake a part of the project with your engineers for a known sum, bearing the loss and gaining the profit. This is known as parallel istisna' (manufacturing contract).