Does one sin if they work for a company that transfers their salary to an interest-based bank due to the absence of Islamic banks in their country, knowing that there is no urgent need compelling them to this job, but rather it is to gain experience in their field of study?

There is no sin upon an employee if his employer transfers his salary to a usurious bank, as long as it is not with his consent and choice. He must withdraw his salary immediately without leaving it in the account, so that the usurious bank does not exploit it and profit from it.