Bronto Software is getting a bigger pad.

The email marketing company is adding another 8,000 square feet to its 13,000-square-foot headquarters in Durham's American Tobacco Campus by expanding into three adjacent offices.

Bronto employs about 90 people, but wants more room as its business increases. The company has about 20 open positions, said CEO and co-founder Joe Colopy.

"Things are going in the right direction," said Colopy, who co-founded the company in 2002 out of his Durham house. "We're having a good time."

Bronto sells marketing services to retailers and other businesses, including Party City, Timex, BatteriesPlus, Dean & Deluca, Samsonite and more. They hire Bronto to help connect with customers through email, social media and, increasingly, various mobile devices.