Employees of Google, Oracle and Red Hat have joined the U.S. government's effort to fix the ailing HeathCare.gov, officials said Thursday. "Dozens" of workers have come aboard the project in recent days, said a spokeswoman for the U.S. Department of Health and Human Services Centers for Medicare and Medicaid Services. HealthCare.gov, where U.S. residents without health insurance are supposed to be able to shop for coverage, has been plagued with slow load times, time outs and other problems since its Oct. 1 launch.