Last summer, Boston-based Where, which runs a mobile ad network and location-based recommendation service, opened a development center in Croatia to supplement its 18-person U.S. mobile engineering staff.
In the last two months, the company hired two mobile developers, bringing its Web and mobile development staff to 15, said Debra Robinson, the company's chief information officer.
Ning, a Silicon Valley start-up, plans to almost double its mobile development staff to 17 to work on a hybrid instant-message and social network it launched in February, said Chief Executive Jason Rosenthal.