Tesla is hiring to support founder Elon Musk’s recently announced plan to become what would be the biggest U.S. manufacturer of solar energy components, according to online posts by senior executives at the company. The posts show the company is acting on Musk’s new vision of setting up 100 gigawatts of domestic solar production, a target he announced last month. “This is an audacious, ambitious project,” Seth Winger, Tesla senior manager for solar products engineering, wrote in one of several posts by company executives on LinkedIn.