Los Angeles-based Rubicon Project, which develops online advertising optimization software, announced this morning that it has hired on two executives to the firm. Rubicon said that it has hired Mark Douglas as Vice President of Engineering, and Seizo Welch as Vice President of Finance. Douglas joins the firm from eHarmony, where he was the firm's Vice President of Technology. Douglas has also served at Oracle. Welch joins from Experian Interactive Media, and prior to that was at LowerMyBills.com before it was acquired by Experian. Rubicon Project develops technology used to optimize advertising revenues for web publishers. The firm is venture backed by Mayfield Fund, Clearstone Venture Partners and IDG Ventures.