Hirofumi Iwasaki is the technical manager of financial systems at Rakuten Card Co., Ltd. He is a frequent speaker for the enterprise systems theme in Japan. He is also a technical writer to write SOA, Java EE, .NET Framework area to some magazines and web sites. He is a specialist of the high-loaded huge transactional enterprise systems in this decade. He has many Java EE & .NET Framework enterprise system design & implementation experiences and knowledge, and directed many huge man-hour enterprise projects. He is also a specialist of WebLogic Server since pre-J2EE version.