What is the ruling on working for a company that sells goods through financial leasing (ijarah tamwiliyah) at a price higher than the cash price, and what is the ruling on the transactions carried out by this company, and what is the ruling on working for the company that finances these transactions?

If the sale is genuine and the company increases the price of the commodity in exchange for deferment, then there is no objection. However, if there is no sale, and the company lends the customer an amount with an increase, then this is forbidden usury (riba). As for insurance, commercial insurance is forbidden, whereas cooperative insurance is permissible. If the transaction is a loan and commercial insurance, it is not permissible for you to calculate it or enter its data into the computer, because that falls under the writing of usury, and "Allah has cursed the one who consumes usury, the one who feeds it, its scribe, and its two witnesses."