How do you shift security left and build DevSecOps culture without becoming a bottleneck?

Shift-left means moving security feedback earlier (design, code, CI) where fixes are cheap — but if every change waits on a human reviewer, you become the bottleneck you were trying to remove. Avoid that by automating the common case (SAST/SCA/secret-scanning in CI with tuned, low-noise rules), self-service threat modeling and security requirements, and risk-based gating — block only on high-confidence, high-severity issues; warn on the rest. Reserve human review for high-risk designs. Crucially, fail fast and in the developer's workflow (PR comments, IDE) rather than in a separate ticket queue, and treat false-positive rate as a first-class metric — noisy tools get ignored.