Tsunayoshi Egawa is a senior manager in one of the platform development division at Yahoo! JAPAN. He currently works on the private CDN and message routing services. Previously at Yahoo! JAPAN, he has developed two platform systems as a manager. The first was a mail advertisement delivery system in order to manage 50 million optin users - to match users and advertisements, and to send to them. The second was a private CDN system that could deliver up to 800 Gbps and 1 million requests per second.