Found an interview with him from November 2023 (https://runet.news/interview/50112). His name is Pavel Sannikov, is in his 30s, from Belarus. He's been working on it since 2018, entirely solo. Apparently spends 3-4 hours a day on it after work, and 8-10 hours a day on weekends! Not a commercial venture, just doing it for fun.

Thank you so much!

Not that much Here is an article about implementation from the author (translate it from russian): google "habr floor796"