Security integrated into the development process (DevSecOps) shifts security from a gate at the end of the release cycle to a continuous activity throughout development. The tooling and practices have matured to make this practical.
Shifting left in practice
Shift-left security means finding security issues earlier in the SDLC when they are cheaper to fix. The practices: SAST (Static Application Security Testing) running in the IDE and CI/CD to find code-level vulnerabilities before merge, DAST (Dynamic Application Security Testing) running against deployed applications before production, dependency scanning for vulnerable third-party libraries, and infrastructure-as-code scanning to catch misconfigured resources before deployment.
SAST tooling
SonarQube, Checkmarx, Veracode, and the GitHub Advanced Security CodeQL tool provide SAST for common languages. SAST tools find patterns associated with vulnerabilities: SQL injection, cross-site scripting, hardcoded credentials, insecure cryptography. False positive rates vary by tool and language. The operational model that works: run SAST as a CI gate that blocks merge on high-confidence findings, report low-confidence findings as warnings for developer review.
Dependency vulnerability scanning
The OWASP Dependency-Check tool (and commercial equivalents: Snyk, Dependabot, Black Duck) scans application dependencies against the NVD (National Vulnerability Database) and vendor advisories. The output: a list of dependencies with known CVEs and their CVSS severity scores. Automated PR creation for dependency updates (Dependabot, Renovate Bot) reduces the manual effort of keeping dependencies current.
The security champion model
DevSecOps at scale requires security knowledge distributed across engineering teams, not centralised in a dedicated security team that reviews releases. The security champion model: each engineering team has a security champion (a developer with additional security training and responsibility for security practices within the team). The security team provides guidance, tooling, and education; champions are the implementation within teams.