The appointment comes at a significant moment in the history of Hostelbookers as it prepares for a series of major improvements to its main website.
Hostelbooker is currently amongst the top three European hostel and budget hotel booking websites.
Efficient Frontier currently handles pay-per-click advertising campaigns for the likes of Expedia and Ebookers on its roster of clients.
Hostelbookers head of e-commerce, Ed Goldswain, said: “Our desire to increase sales and improve ROI kicked off our search for new PPC technology.
“We believe it [Efficient Frontier] will drive profitable growth across our campaigns and give us better strategic control.”