Box has started hiring again, after announcing aggressive international expansion to Europe.

The four new additions to the team will focus on hiring, generating revenue, and securing strategic partnerships in the U.S. and abroad.

The Los Altos, Calif.-based cloud services startup reports that sales have increased 150 percent in 2012 and are on track to more than double again this year.

To keep up the pace of growth, the company has lured some serious sales chops from business software giants like Salesforce and Oracle. COO Dan Levin said the new sales additions will focus on traditional mid-market and enterprise sales, as well as new verticals. Box is wading into new sectors, including health care and education.

“Our new hires are excited to join a young and aggressive company where they can have a real impact,” Box COO Dan Levin told me.

Box is competitor to Dropbox, which just announced that the extension of its platform would do away with the hard drive.

Levin is not worried. He said  Box’s strategy is to appeal to mid-size and large companies who need “security and control,” and these new hires will help with that. Meanwhile, he said, Dropbox is about solving consumer content management problems; it’s about “sharing stuff with your cousin.”

Box has its own platform and is expanding quickly. Levin said he found the best person to lead that initiative, Ryan Martin, who will deepen relationships with third-party developers. Most recently, Martin built out the sales team behind Salesforce’s platform,

To attract talent to its platform, Box just announced an experimental new plan to split revenues with third-party developers. More on that here.

The four new hires are:

Jim Priestley, Senior Vice President of Sales. In his most recent role at Oracle, as Group Vice President, he led a team of more than 200 sales professionals. At Box, Jim will head up sales for the company’s mid-sized enterprise customers.

Stephen Morse, Vice President, Global Sales Engineering. At, he managed the sales engineering team in the Asia-Pacific region. He will be helping Box further develop its sales engineering organization and expand its global sales infrastructure.

Ryan Martin, Vice President, Platform Sales. Ryan Martin joins Box as Vice President of Platform Sales, a newly created position that includes responsibility for working with customers and prospects on integrations with the Box Platform and APIs. Prior to joining Box, Ryan built the sales team responsible for driving Salesforce’s platform.

Scott Hebert, Vice President, Vertical Industry Sales. Prior to joining Box, Scott held a variety of sales leadership roles that span a variety of industries and regions with both and IBM.  At Box, Scott will lead the sales team to aggressively go to market with Box’s core product and industry solutions for healthcare, financial services, public sector, retail, and more.