The gig economy has spread to restaurants, thanks to Scottsdale-based Qwick, a free mobile app for hospitality staffing. “We are thrilled to transform the industry by providing an effective way for people to supplement their income or have a healthy work-life balance,” co-founder/CEO Jamie Baxter says. The app aggregates shifts and job listings, providing flexibility and instant gratification: Workers can get paychecks half an hour after shifts.