tl;dr: Martin von Zweigbergk, creator of the Jujutsu (jj) version control system, has left Google to become CTO of East River Source Control, a startup building next-gen VCS tooling for the AI era. He'll continue maintaining Jujutsu as open source, but argues the Git-based server/storage layer needs to be rethought—work better suited to a company than an OSS project. ERSC, backed by Amplify Partners, is launching its Storage product in private beta later this month.