Human-computer interaction #HCI, computer science & programming, home server & self-hosting, games and other fun stuff. Fediverse tool builder: @encyclia, @canary, FediRoster, Pinhole, ... see https://fietkau.software/tag/fediverse for more. I also help out with @fedidevs. If you do HCI-related research, check out https://directory.hci.social. He/him. Posting mostly in English, but you might see the occasional German boost.
