Lewis, who joined in May, is rumoured to be joining rival Precise Mortgages.
Steven Nicholas, chief executive of Tiuta, says he is sad to see a valued member of the Tiuta team leave but wishes him all the best in his new role.
He says: “From our point of view, we have no plans to employ an immediate replacement as we have a very strong business development team already in place who fulfil that role, notably Kirsty Buchanan who has flourished at Tiuta since she joined as business development manager in May this year.
“We have experienced record business levels at Tiuta throughout the summer months and we are looking at a record amount of enquiries already in September.
“Our focus, as always, is on delivering a quality service and ensuring our brokers and introducers have everything they need in order to complete business with us.”
In April this year Tiuta’s head of marketing Stuart Brumhill and head of business development Guy Garrard both left the firm, along with Tiuta’s regional account managers Gordon Rae and Jim Baker.