What is the ruling on working in a bank that operates under the Islamic system, yet engages in circumvention of Islamic financing formulas, and what is the ruling on the profits from deposits in this bank?

There is no objection to remaining in the job so long as it is free from deception involving usury and assisting in it. There is no harm in depositing money in an Islamic bank for the purpose of profit, provided it adheres to the Sharia regulations for investing money.