WASHINGTON (AP) — The management consultant President Barack Obama has asked to oversee the fixes to HealthCare.gov says there are dozens of problems that need to be addressed, but the system is fixable.

Jeffrey Zients tells reporters that it will take a lot of work, but the majority of the issues will be resolved by the end of November. At that point, he says users should experience far fewer errors, though he stops short of promising the problems will go away completely.

The system is made up of layers of components interacting in real time with consumers, government agencies and insurance company computers.

A private contractor responsible for two components of the website has been assigned to lead the fix. Quality Software Systems built the federal data hub, a major linchpin that works relatively well, and an accounts registration feature that froze and caused many of the initial problems.

Until now, officials at the federal government's Centers for Medicare and Medicaid Services had the lead role on HealthCare.gov, but they appear to have gotten in over their heads.