"The security practice is fundamental to our future business. Security is an essential component of the digital transformation journey and Gavin's experience in the IT security industry, coupled with his team leadership skills, perfectly positions him to lead this strategic practice," said chief executive Michael Chanter.
Coulthard has been in the IT industry for 24 years, most recently as a product sales specialist at Citrix.
He previously served as ANZ systems engineering manager at Palo Alto Networks, and ANZ field systems engineering manager at F5 Networks.
He holds a BSc in computing from Swinburne University of Technology and a Bachelor of Information Systems from Deakin University.