Guidewire Software, Inc., commonly Guidewire, is an American software company based in San Mateo, California. It offers an industry platform for property and casualty (P&C) insurance carriers in the U.S. and worldwide. The company has been cited as being among the 50 most desirable mid-size Bay Area companies (101 to 500 employees) to work for 2010-2012, and was in the "Top 50 Large Companies" in Glassdoor's Best Places To Work for both 2015 and 2016.