Naomi Nix:

Initially, the team carried just two product managers and one or two designers alongside dozens of engineers — a flatter and more coder-dominated group than most Meta product teams, Mosseri said. (At launch, it had grown to three product managers, three designers and 50 coders.) Instead of 30-minute presentations on a single design decision, typical at Facebook and Instagram, “It would be like, ‘Here are six things we need to go through this week.’”

Meta went for an engineer-heavy team composition and light weight process to build Threads.