"Let me be clear: HealthCare.gov is fixable," Zients said on a conference call with reporters. He said that it would "work smoothly" by the end of November.
Zients also announced that the Department of Human and Health Services is bringing in a general contractor, Quality Software Systems Inc., to manage the fixes.
"There is a lot of work to do," Zients said. He promised "meaningful improvements on the site's performance each and every week."