Batara Eto co-founded Japan's first major social networking site Mixi and served as its CTO before launching East Ventures, giving him a rare operator background building one of Japan's earliest internet success stories. As a Japanese-Indonesian bridge investor, he co-founded East Ventures specifically to connect Japanese capital and experience with Indonesian and Southeast Asian founders, making him a cross-border Japan-SEA specialist who brings a hands-on, product and engineering-led investment perspective from his CTO experience scaling Mixi.