As an experienced Tech Lead Efthymios Sarmpanis used a lot of different technologies, before he settled on Flutter. He was immediately hooked and has since put a goal of introducing Flutter to as many people as he can. He started off by speaking to international conferences and Meetups, then continued to hosting the first ever Meetup in Athens, a group that by now counts more than 200 members. He also created a number of opensource libraries as well as contributed code to the main Flutter repo. His medium articles have gathered thousands of reads and he is also active in Flutter Gr's slack workspace, helping out people.