SSDLC integrates security into every phase, from design to deployment. Secure by design starts with threat modeling via Microsoft Threat Modeling Tool. SAST tools like SonarQube and Semgrep scan code automatically in CI. SCA with Dependabot catches vulnerable dependencies. DAST and IAST via Contrast Security test running apps. Container scanning with Aqua Security fortifies Docker images. Secrets detection using GitGuardian prevents accidental leaks. Production security is enhanced with runtime protection and WAFs, and continuous monitoring using SIEM solutions. This approach significantly reduces vulnerabilities and accelerates secure delivery.