The Waltham e-mail marketing firm Constant Contact Inc. has eliminated more than 200 jobs across its worldwide operations days after it was acquired for $1.1 billion by Endurance International Group Holdings Inc. of Burlington. “Constant Contact is an exceptionally strong business and will play a key role in Endurance’s family of brands,” Endurance’s chief operating officer, Ron LaSalvia, said in a statement. “Any time you bring together two strong public companies, there is naturally going to be some overlap.“ Constant Contact, which manages e-mail marketing campaigns for about 650,000 small businesses, had about 1,400 employees as of late 2015. LaSalvia said the company has cut 15 percent of the workforce, which is at six US facilities and a London office. The company did not disclose how many jobs were cut in Waltham. Endurance agreed to buy Constant Contact for $32 a share, a 23 percent premium over Constant Contact’s stock closing price on Oct. 30. The acquisition raises Endurance’s debt to around $2 billion, giving it a strong incentive to cut costs. Endurance is the second-largest US provider of Internet hosting services for small businesses, after GoDaddy Operating Co.