Yorkshire Building Society migrating application development to improve customer satisfaction Yorkshire Building Society is moving to new application development platform to support the creation of customer-friendly online services Share this item with your network: By Published: 27 Jan 2021 15:15 Yorkshire Building Society is migrating app development from its legacy system as part of a large investment in digital, which has accelerated during the Covid-19 pandemic. The building society is moving from an in-house legacy platform to an application development environment from Outsystems. As well as Yorkshire Building Society, the group includes Chelsea Building Society, Norwich and Peterborough Building Society, and Accord Mortgages.