I am a database engineer at Facebook.
Before joining Facebook, I was a principal database and infrastructure architect at DeNA. My primary responsibility at DeNA was to make our database infrastructure more reliable, faster and more scalable. Before joining DeNA, I worked at MySQL/Sun/Oracle as a lead MySQL consultant in APAC for four years.
You can contact me on Yoshinori.Matsunobu_at_gmail.com (replace _at_ with @).