USPTO has announced a position for US citizens on the China team.  Here is the link: http://www.usajobs.gov/GetJob/ViewDetails/364794400 .  The position requires US citizenship, a law degree, knowledge and experience in intellectual property and the ability to conduct research in Chinese. The position requires a minimum of three years general legal experience and one year specialized legal experience in intellectual property.

USPTO was recognized as the best federal agency to work for in 2013.