To keep up with pandemic boom in online shopping, Amazon hired 427,300 employees in 10 months.

Amazon has embarked on an extraordinary hiring binge this year, vacuuming up an average of 1,400 new workers a day and solidifying its power as online shopping becomes more entrenched during the coronavirus pandemic.

The spree has accelerated since the onset of the pandemic, which has turbocharged Amazon’s business and made it a winner of the crisis. Starting in July, the company brought on about 350,000 employees, or 2,800 a day, The New York Times’s Karen Weise reports. Most have been warehouse workers, but Amazon has also hired software engineers and hardware specialists to power enterprises such as cloud computing, streaming entertainment and devices, which have boomed in the pandemic.

The scale of hiring is even larger than it may seem because the numbers do not account for employee churn, nor do they include the 100,000 temporary workers who have been recruited for the holiday shopping season. They also do not include what internal documents show as roughly 500,000 delivery drivers, who are contractors and not direct Amazon employees.

The new hires have increased Amazon’s global work force to more than 1.2 million employees.

Amazon’s rapid employee growth is unrivaled in the history of corporate America. It far outstrips the 230,000 employees that Walmart, the largest private employer with more than 2.2 million workers, added in a single year two decades ago. The closest comparisons are the hiring that entire industries carried out in wartime, such as shipbuilding during the early years of World War II or home building after service members returned, economists and corporate historians said.

The company has also almost tripled the number of U.S. warehouses used for last-mile deliveries this year, said Marc Wulfraat, founder of the logistics consulting firm MWPVL International, who tracks Amazon’s operations. The delivery drivers are usually contractors, so Amazon does not disclose their numbers in regulatory filings.

“They have built their own UPS in the last several years,” Mr. Wulfraat said. “This pace of change has never been seen before.”