How do you decide whether a particular job or employer is good or bad, or rather worthwhile? A few obvious questions come to mind. Does the job pay well? What is the work environment like? Is it a high-stress job? Do you feel like you're making a difference? While these concerns apply to any career, they're particularly interesting in the highly competitive technology industry. PayScale sought out some answers, surveying some 33,500 tech workers to rate their employers across nine data points.