The phrase "multiple projects" refers to working on more than one task or assignment at the same time. It means having different projects or activities that need to be done concurrently. Full definition
They have to meet hard deadlines, manage multiple projects at once, and present their findings in front of other intelligent doctors who are trained to find holes in their logic. (nextscientist.com)
Worked on multiple projects simultaneously providing maintenance, security, and support for company agendas and daily tasks. (jobhero.com)
Excellent at handling multiple projects with grace and accuracy. (members.climber.com)