O’Reilly has joined from Legal & General, where he worked in general insurance and protection.
Before that he worked at HBOS and Lloyds in product management and for BM Solutions in key account management.
Louisa Sedgwick, Leeds head of corporate accounts, said: “James will look after specialist new build intermediaries and developers and completes and complements the rest of the team.
“New build is a growing market for us, where we have strong expertise and experience, and we’ve been working closely with our broker partners and major housebuilders to develop products tailored to this market, such as bespoke versions of our Help to Buy home loans and our award-winning Welcome Mortgage.
“We’ve also reviewed and refined lending criteria to smooth the application process and help more brokers and their clients.”
In the past 12 months Leeds’ underwriting team has tripled in size, with the society hiring extra regional development managers and telephone business development managers to help brokers over the phone.