https://wezz-y.com/archives/68198
https://r.nikkei.com/article/DGXMZO48171680T00C19A8000000
https://www.it-career-navi.com/entry/freelance-engineer
https://sp.fnn.jp/posts/00047499HDK/201908011830_YusukeFujita_HDK
https://www.newsweekjapan.jp/stories/world/2019/07/post-12642.php