Employees at its warehouses across the U.S. have alleged unsafe working conditions, and they fret over job security in the age of artificial intelligence. Amazon’s chief technologist, Tye Brady, disputes both counts.

Amazon uses a tiered storage system in its warehousing and fulfillment network to manage items of varying sizes, weights, and shapes efficiently.

Amazon’s efforts to improve inventory placement are bearing fruit while more investments are underway.

The 4.5 million-square-foot, six-story facility has more than 7,000 robots.

The Washington State facility employs 2,500 people and can store 40 million items.