Amazon.com Inc. reportedly is planning to hire 30,000 part-time U.S. jobs to keep up with growth in its business.

Of the jobs, 25,000 will be warehouse positions and the remaining 5,000 home-based positions answering customer calls, emails and chats “in what the online retail giant calls its virtual customer-service department,” the Wall Street Journal reported.

Amazon has expanded its workforce and has been building many more warehouses to be closer to its customers. Such proximity cuts shipping charges and allows the company to deliver more of its own packages.

Tom Weiland, vice president for world-wide customer service, told the Journal that” a rapidly growing customer base is the reason for more than doubling the size” of the U.S. virtual customer-service program.

“Our work-from-home program, just like our customer-service program generally, continues to grow because the Amazon business continues to grow so fast,” he told the Journal. “We just need to keep up