AtScale is planning to invest up to $25m in Bulgaria. The California company, a global leader in large data management, opened its first international office in Sofia where plans to boost its staff to 50 employees by next year. Established in 2013, AtScale was founded in 2013 by former staffers from Oracle, Cisco, Salesforce, Microsoft, Yahoo, Google, IBM and Netezza. The company also intends to expand its business in France, the UK and Asia.