First spotted by CNBC, Kumar will report directly to CEO Doug McMillon, who said Kumar "has a unique understanding of the intersection of technology and retail."
"The technology of today and tomorrow enables us to serve our customers and associates in ways that weren't previously possible," McMillon added.
At Google, Kumar served as vice president and general manager of display, video, app ads and analytics. At Microsoft, he was corporate vice president of cloud infrastructure and operations. He spent 15 years at Amazon, including as vice president of technology for retail.
Walmart has been pushing more into tech, last week launching a range of.
Walmart is also selling a 10.1-inch tablet with detachable keyboard for $99.
They all have a 2-megapixel rear camera, a 0.3-megapixel front-facing camera, a 2.5D touchscreen, and a resolution of 800x1,280.
Walmart, looking to compete more with Amazon,this month.