Reviewing architecture and reviewing code are totally different thing. Pushing code to production is not a one-step process. It has at least two phases: first

Reviewing architecture and reviewing code are totally different thing. Pushing code to production is not a one-step process. It has at least two phases: first push code to the repository, then build the binary and push the binary to production. Pushing code to the repository requires code review: most reviewers are your peers or owners if you work in other team's codebase. So really no central team to review code. Reviewing architecture, maybe, but it depends on the impact of the system to change. Pushing binary to production doesn't really need review in normal case, assuming there is a good binary/release qualification and a good release rollout system, all can be automated. Emergency push to production may need a second pair of eyes but it also depends on the urgency.