At Sony Corporation, I was a design/implementation/team leader for 3D graphics software development in C++/VRML2.0/JAVA on Windows (1995-1998), home network software development with HAVi and streaming (HTTP/RTP) in C/C++/Java (1999-2002), XMPP-based internet-to-home software development both server side and client side with Apache/Tomcat/SOAP/XMPP in C/C++/Java on Linux (2003-2005) then I introduced embedded Linux to Sony Walkman products with NECEL MP201 (ARM9) (2006-2008), then I introduced Android 2.4/4.0 to Sony Walkman products with NVIDIA Tegra2 (dual Cortex-A9) (2009-2012). At Sony Video & Sound Products, I was a study/design/implementation/team leader for NuttX-based Voice recorder and Walkman system software development with ON Semiconductor LC823450 (2013-2019).