Boston-based stealthy startup ClearSky Data closed $12 million in funding from General Catalyst and Highland Capital Partners, according to Boston.com. ClearSky presently employs less than 10 workers in its team, wrote VentureBeat.

What the secretive firm is doing is not yet clear, but it is hiring people who specialize in security, networking, virtualization, and storage. According to co-founder Ellen Rubin, the company solves enterprise infrastructure problems for medium and large businesses, the report explained.

Rubin is an expert in cloud computing, data warehousing, data center markets, and business intelligence. A previous employee at data warehousing firm Netezza, she later co-founded cloud migration firm CloudSwitch. Verizon acquired the said firm in 2011, the report detailed.

Lazarus Vekiarides, on the other hand, was a pioneer worker at EqualLogic, which Dell bought in 2007. There, he worked on storage management, Windows integration technology, and disaster recovery, the report said.

Sean Dalton of Highland and David Orfao of General Catalyst are joining ClearSky's board, VentureBeat reported.