Even though the job market has been less than stellar, a new study from CareerBuilder found that 35 percent of hiring managers have positions that sat unfilled for over 12 weeks. Jobs in health care, sales and technology are the hardest to fill according to their online survey of more than 2,000 hiring managers.

The hardest to fill jobs (in order of jobs added between 2010 -2013) include:

Sales representative

Machine operator/Assembler/Production

Nurse

Truck Driver

Software Developer

Engineer

Marketing professional

Accountant

Mechanic

IT manager/Network administrator

Each of these hard-to-fill positions are experiencing positive job growth.