Amazon Cloud’s New Boss Girds to Defend Turf It Pioneered

Adam Selipsky has taken over at Amazon.com Inc.’s cloud-computing unit this year as it faces the biggest challenge ever to its dominance in the industry. To stay on top, he is taking a page from the playbook of his fast-growing rivals.

Microsoft Corp. and Alphabet Inc.’s Google have come on strong in recent years by offering customers not just the cloud infrastructure that Amazon Web Services pioneered, but also sophisticated and popular end-user software programs, such as those that help turn companies’ pools of data into charts or tools for employee collaboration.