IT Position at Wise MoneyTransfer Fintech - permissible employment?


I am currently interviewing for an IT position at a money transfer fintech called Wise (formerly TransferWise). Recently they have expanded their offerings to include an international debit card for spending abroad. Customers who use this can opt-in to put the money in their account into a fund that holds government-guaranteed assets such as bonds which will earn them interest and Wise take a small fee for this. Other options include funds that hold stocks and shares.

The role itself entails generally keeping the network in a reliable condition. Is working for such a company that has these small dealings with interest permissible?

Job specification: Network Reliability Engineer - Wise Careers