Elon Musk’s deputy Steve Davis has spent more than 20 years helping the billionaire cut costs at businesses like SpaceX, the Boring Company and Twitter — making the engineer by training a natural choice for his new role at Musk’s Department of Government Efficiency, or DOGE for short.Davis is helping recruit staff at DOGE, Musk’s effort to reduce government waste, in addition to his day job as president of Musk’s tunneling startup, the Boring Company. At Boring, Davis has a reputation for frugal...