Jun Sakai

Jun Sakai (酒井潤, born 14 June 1979) is a Japanese YouTuber, engineer and investor from Chiba Prefecture. He studied at Doshisha University and the Japan Advanced Institute of Science and Technology, worked for NTT DoCoMo, and describes himself as a Silicon Valley and Hawaii engineer. Before moving into IT, he aimed to become a professional footballer and won a gold medal at the East Asian Games while at university. His YouTube channel, Silicon Valley Engineer Jun Sakai Channel, covers how to work as an IT engineer in Silicon Valley and had 41,600 followers in November 2025.