STOCKHOLM--(BUSINESS WIRE)--Clavister (STO:CLAV) Clavister (Nasdaq: CLAV), a leader in high-performance network security, is looking to expand its research and development team by 50% as it continues to see strong interest in its solutions internationally. In addition to the strengthening of the research and development team, Clavister has also grown its Quality Assurance and Customer Support teams to extend its solution range, and meet the demands of its expanding enterprise and carrier level