William T. Sandalls Jr., vice chairman of BayBanks Inc., is leaving the Boston company to join MasterCard International in the new post of chief operating officer, the card association said Monday.

Mr. Sandalls, 47, is an electronic banking luminary who is credited with building an important consumer banking franchise at the New England company.

Limited Time Offer

Save $400 off your subscription. Special offer ends April 30, 2017.

14-Day Free Trial

No credit card required. Complete access to articles, breaking news and industry data.