AMD is hiring two senior engineers who previously worked at the company earlier in their careers before heading to rivals. Wayne Meretsky, a technical lead for Mac OS at Apple before joining AMD in 1999, returned to AMD once again in December after a stint at a robotics company and other roles. Reuters reports that Charles Matar is also returning to AMD as vice president of System-on-Chip Development following his departure from Qualcomm. The two hires, described by AMD as an effort to expand into new markets, come shortly after former Apple chip designer Jim Keller joined AMD as chief architect in August last year. AMD has been losing money , struggling to get its chips into PCs, and two rounds of layoffs saw the company let key execs..