He will be responsible for growing the comparison site’s mortgage offering.
Gordon previously worked as director of mortgage propositions at Metro Bank.
Jonathon Brown, chief executive at Comparethemarket.com, said: “We’re very pleased to welcome Mark to the team.
“He brings a wealth of experience in the retail financial services sector and will be a strong addition as we continue to grow the mortgage proposition and deliver the next phase of growth in the business.”
Andy Piggott is to replace Gordon at Metro Bank, joining as director of lending products, reporting to chief commercial officer Paul Riseborough.
Piggott comes from TSB where he was head of cards, after previously working as head of personal current accounts.
He will oversee Metro’s mortgages and unsecured lending products, including loans and credit cards.
A Metro Bank spokeswoman said: “Mark joined us in 2012 and has helped grow our mortgage offering from its infancy into a top 20 lender and we wish him well with his new venture.”
Riseborough added: “I’m delighted to welcome Andy to the team at such an exciting time for us.
“As our mortgage business continues to go from strength-to-strength, I know Andy’s strong financial services experience coupled with his ability to think outside the box, will enhance our offering still further.”