I have nine year's experiences for development of various open source such as Linux, PostgreSQL, Apache and so on. Many of contributions are merged within the upstreamed version, and some of projects are known as distinct one; such as sepgsql, mod_selinux, pg_strom and so on.
I started my carrier as level-3 support engineer of Linux kernel, then moved on technology development for innovation based on OSS/Linux.
Nowadays, I focus on feature development of security-enhanced PostgreSQL and its utilization on web-application security, and query acceleration using GPU device towards "big-data".