Yen served as the Director of Software Engineering for Cydrome Inc, where he worked with his brother David, who served as the Director of Hardware Engineering. They were the major contributors to the Cydra-5 mini-supercomputer. The system was a combination of a VLIW ECL-based processor used for scientific applications and a multi-processor system designed for a bus architecture based on their . Yen served as Senior Vice President of SGI from 1988 to 1996, where he led development on OpenGL and also served as President of subsidiary MIPS Technologies. In 1996, he left SGI and founded TVsoft, a maker of interactive software for television setup devices. The company was renamed Navio and later merged with Oracle's Network Computer. Subsequently, the company went public as Liberate Technologies in July 1999. Its public offering reached a $12 billion valuation in early 2000 with a revenue run rate of $25 million. In parallel, Yen founded a company called ArtX, employed with former SGI graphics engineers. ArtX received the contract to deliver the Nintendo Gamecube's Flipper graphics chip. The company was acquired by ATI in February 2000 for $400 million. This led to ATI's greatly improved R300 graphics chip family. Yen later joined ATI's board of directors. With Nintendo, Yen cofounded another company iQue, the manufacturing and distributing arm of Nintendo for mainland China. Yen founded iGware, a company that offers cloud computing services to its customers, including Nintendo. iGware's cloud services power the online services of the Nintendo DS, the Nintendo 3DS, the Nintendo Wii, and the Nintendo Wii U. In July 2011, Acer, of which Yen is a former board member, acquired the US-based iGware for $320 million, and thus iGware becomes a part of Acer's company structure in providing cloud services. iGware changed its name to Acer Cloud Technology Co. and continued to be headed by Yen. As a result of the acquisition, Yen is the second largest shareholder of Acer after founder Stan Shih. Yen is currently the chairman and founder of AiLive, the company that partnered with Nintendo in developing software tools for programmers working with the Wii Remote controller and Wii MotionPlus attachment. Yen has been on the board of several prominent companies including Acer, ATI, MoSys, and others.
