Shift-Left Security

Shift-left security argues that defects, including security defects, are cheaper to fix the closer they are caught to where they were introduced. Concretely, it means embedding threat modeling in design reviews, running SAST and SCA in the IDE and on every pull request, scanning Infrastructure-as-Code before apply, and validating dependencies and container images at build time. It complements — not replaces — runtime defenses; it simply reduces the volume and severity of issues that ever reach those defenses. Successful shift-left depends on fast, accurate tooling, good developer experience and clear ownership so security feedback does not become noise.