The demand for part-time and flexible hour employees across the U.S. is rising as companies look to fill gaps created by a worker shortage and the resulting difficulty in finding full-time employees.

The number of job postings seeking part-time and flexible hour employees has jumped 13% in the last 30 days, with some jobs seeing an increase of as much as 3,000%, according to a new job posting analysis by staffing company PeopleReady.

Part-time and flexible hour jobs now account for nearly 18% of all job postings as companies throughout the U.S. grapple with current workforce challenges to keep business moving forward.

Some of the part-time and flexible hour jobs seeing the most explosive growth over the last 30 days:

• 3,168% increase in newly posted jobs for pickup and delivery drivers
• 963% for sales associates
• 408% for package sorters
• 388% for trash collectors

“When there are major workforce fluctuations, temporary workers become even more vital in helping businesses stay flexible while meeting demand,” said Taryn Owen, president and COO, PeopleReady and PeopleScout. “In addition to working with more businesses to connect them with a contingent workforce, we have seen a steady increase in the number of people looking for part-time and flexible hour work.”