Daiki Matsudate is an iOS based developer. Since he was in University, he has started his developer career in Tokyo. He is a member of organizers of try!Swift Tokyo and Swagger-codegen technical committee. He loves to use Firebase in his product, so has self-published Firebase book for Japanese. https://yakiringo.booth.pm/items/835645 and talked about Firebase in some meetups and conference. When not coding, he tends to be away from Tokyo, and go around domestic Japan or oversea.