Sam leads a team of sixteen developers, and four of them do almost all the reviewing. Pull requests wait days for a first look, and company policy rules out sharing code with outside services.
A private code review assistant gives every pull request a thoughtful first pass within minutes. Missing tests and risky changes get flagged early, so the senior folks spend their time on design conversations instead of nitpicks.
The newest developers say it's like having a patient mentor who never gets tired of questions.