What is DevSecOps?

DevSecOps Practices

Shift Left Security

Shifting left means moving security activities earlier in the software development lifecycle — from post-development testing to the design and coding phases where fixing vulnerabilities is least expensive. A vulnerability identified in threat modeling before code is written costs nothing to remediate. The same vulnerability discovered in production after a breach costs an order of magnitude more. DevSecOps operationalizes this economic reality by embedding security at every development phase rather than treating it as a gate at the end.

Security in CI/CD Pipelines

Continuous Integration/Continuous Deployment pipelines automate the build, test, and deployment of software. DevSecOps integrates security testing into these pipelines: Static Application Security Testing (SAST) scans source code for vulnerabilities before compilation; Dynamic Application Security Testing (DAST) tests running applications for exploitable vulnerabilities; Software Composition Analysis (SCA) identifies vulnerable open-source dependencies; secrets scanning prevents credentials from being committed to source repositories; and Infrastructure-as-Code security scanning identifies misconfigured cloud resources before deployment.

Developer Security Training

Developers who understand security write more secure code. DevSecOps programs include developer security training focused on the vulnerability classes most relevant to the technologies and application types the team builds, secure code review training, and threat modeling methodology. The OWASP Top 10 — the most widely referenced list of web application security risks — provides a baseline curriculum for web application developer security training.

The Cultural Dimension of DevSecOps

DevSecOps is more a cultural shift than a tool selection. Organizations that adopt DevSecOps tools without the organizational culture that makes them effective — shared ownership of security between development, security, and operations teams — find that automated security scanning generates findings that nobody acts on, security gates that developers route around, and vulnerability debt that accumulates faster than it is remediated.

Effective DevSecOps programs treat security as a shared engineering responsibility rather than a security team function. Developers have security champions embedded in their teams. Security findings from automated scanning feed directly into developer work queues with clear remediation guidance. Security metrics — mean time to remediate vulnerabilities, percentage of builds passing security gates, open vulnerability count by severity — are visible to engineering leadership alongside traditional delivery metrics.

DevSecOps for PE Portfolio Software Companies

PE-backed software companies that lack DevSecOps practices carry technical security debt that manifests as customer security questionnaire failures, SOC 2 finding responses, and breach risk from unaddressed application vulnerabilities. Implementing DevSecOps in an established development organization requires change management as much as technology deployment: developers accustomed to shipping without security gates resist the process changes that DevSecOps requires.

The highest-impact starting points for organizations beginning a DevSecOps journey are: secrets scanning to prevent credential exposure in source repositories, SCA to identify and remediate vulnerable open-source dependencies, and developer security training on the OWASP Top 10. These three investments address the highest-probability application security vulnerabilities with reasonable implementation effort.

Real-World Example: Codecov Supply Chain Attack — DevSecOps Failure

In April 2021, attackers compromised Codecov's Docker image creation process and inserted a malicious script into their Bash Uploader tool. Thousands of organizations that used Codecov in their CI/CD pipelines executed the malicious script as part of their build process, exposing environment variables including credentials, API tokens, and keys. The attack succeeded because Codecov's own build process lacked integrity verification — a DevSecOps control that would have detected the tampering. Organizations affected included Twilio, HashiCorp, and Rapid7.