Uber drivers are planning to strike Wednesday by turning off their apps ahead of the company's public offering, which is expected to be the largest of the new tech IPOs this year. Drivers say they want higher pay and benefits. Uber has avoided having to provide benefits because their drivers are considered independent contractors. In fact, a lot of tech workers in Silicon Valley are contractors -- including people you might expect to have permanent jobs. That includes people with degrees, like programmers and data analysts. Many are people of color, and they hang in long limbo as they reach for a permanent position. Guest: Sam Harnett, KQED Silicon Valley reporter