Workers at some promising tech startups can give off the sort of energy that comes from being a part of a team that just might change the world. At Austin's Alegion Inc., the employees exude that upbeat vibe. The company, which two years ago had fewer than 10 employees, now has more than 60 working in a converted warehouse next to the train tracks in East Austin. The funky chic location is a way to conserve funds for the work ahead. Alegion is among a pioneering group of companies in the field of "data labeling" and it is collaborating with several big corporations that are developing artificial intelligence-based systems that could transform their business operations. Its work could potentially help clients make a big impact in fields such as retail, manufacturing, financial services and health care.