SUNNYVALE, Calif.--(BUSINESS WIRE)--Simply Hired, the largest independent job search engine with properties in 24 countries and 12 languages, today released its May 2015 U.S. Employment Outlook which shows that U.S. job openings increased for the fourth consecutive month in May 2015. Nationwide job listings were up 1.81% when compared to April 2015 with all major U.S. metros posting gains. More positive news for job seekers: this month’s U.S. Employment Outlook Trend Spotlight data digs into tr