The platform will be rolled out across the group, starting with new lending through intermediary arm Accord from 2019.
The so-called Mortgage Sales and Originations (MSO) software aims to create a more efficient experience, no-keying, and generating quicker mortgage lending decisions and giving access to companies such as valuers and conveyancers to help simplify the mortgage application process.
The platform is part of the lender’s plans to improve service to brokers, as well as direct lending to customers.
Jeremy Duncombe, director of intermediary lending at YBS, said: “The appointment of IRESS is the latest in a series of developments we continue to make to strengthen our role in the intermediary market.
“There’s no doubt brokers value the importance of a human touch throughout the mortgage application process – our core strategy of principle based underwriting and named underwriter contacts will remain key – however, it’s also important we have leading-edge technology to complement our teams and the intermediaries we work with.
Paul Thornton, IRESS’ executive general manager (lending) added: “Everyone on the team is delighted to be working with the Yorkshire Building Society Group.
“Our technology will help the group make a step change in the intermediary and customer experience – streamlining mortgage processes, simplifying lending policy and empowering users across the end-to-end journey.”