One of the earliest high-tech tenants in Boston's Innovation District is mulling a move to what could be city's next hot neighborhood for bits and bytes: Downtown Crossing.

Bullhorn Inc., maker of online recruiting tools, is nearing capacity at its longtime digs on Farnsworth Street. The company has been there since 2005 — before the Innovation District moniker caught on — and is in the midst of a growth spurt. Founder Art Papas said Bullhorn has hired 100 new workers this year already and expects to add another 100 before the year is out.

The expansion would bring the company's total workforce to about 600.


Papas said Bullhorn could add to the 45,000 square feet it occupies in its current location but could also relocate to Downtown Crossing.

"It's funny because it's mostly financial services, but then you see people in shorts and T-shirts and you know they work for a tech company," he said. "It's starting to change over there."

Surprisingly Bullhorn's hiring spree hasn't been funded by venture capital but has come under private equity ownership. Papas sold his company to Vista Equity Partners of Austin in 2012 but has remained in the chief executive's seat.

He's even befriended Vista cofounder and president Brian Sheth, a one-time athletic rival whose high school soccer team pummeled Papas's squad back when both men were teenage footballers.

Callum Borchers can be reached at callum.borchers@globe.com. Follow him on Twitter @callumborchers.