He joined Sun in 1995, and eventually ran the company’s United Kingdom unit, then its European operations. Prior to that, he worked at IBM in a variety of engineering and management jobs. Youngjohns starts at Callidus on May 31. Callidus was founded in 1996, and its TrueComp software is noteworthy in that it runs on a grid computing architecture.

Callidus had a pretty good 2003, with $71.7m in sales and a modest profit, but in 2004 sales declined to $58.7m and it booked a $25.5m loss. Last summer, Callidus missed its guidance to Wall Street and ousted its president, CEO, and chairman, Reed Taussig, and began looking for a new president and CEO.

Stuart Wells, who is Sun’s top executive for the Wall Street area, takes over Youngjohns’ posts as the head of strategic development and the executive in charge of Sun Financing.