Amazon's CEO Jeff Bezos. MARK RALSTON/AFP via Getty Images Amazon is rapidly expanding its corporate and tech workforce in Boston. It's adding 3,000 positions in the city "over the next several years," it said. About 400 roles are already open in the area. The roles will be based at its Boston Tech Hub and a 17-story office building that it's just leased. Visit Business Insider's homepage for more stories. Amazon, already the second-largest employer in America, is expanding its workforce by hiring 3,000 corporate and tech employees in Boston, it announced Tuesday.The jobs would include technology, AI, and software development roles, Amazon said.