In the market for a solid ad automation platform, i.e., one that can make more of your existing inventory? Well, Randy White, Vice President of Media Services at CareerBuilder.com, couldn’t be happier with Rubicon Project. About 5 years after teaming up with ad tech firm, CareerBuilder has seen about a 400% improvement in its effective CPM, White told those in attendance for MediaPost’s RTB Insider Summit on Friday. (For the record, White was sitting right next to Kaylie Smith, head of Rubicon’s Seller Cloud.) Appeasing Smith or not, White insisted: “We’ve become incredibly efficient.” Part of that process has included shedding a ton of sales people, though White didn’t say how many. The reallocation of those recourses has allowed the company to focus on other businesses, he added.