This document outlines the PSDL framework used to build secure software from design through release. Page 1 highlights the increasing frequency of supply-chain and dependency-based attacks. The lifecycle includes threat modeling, secure coding practices, SAST/DAST scanning, SBOM creation, fuzzing, pen testing, secure configuration, and release governance. Visuals depict stage-by-stage controls. The paper emphasizes automation, developer training, and compliance alignment (ISO, SOC, NIST). It concludes with recommendations for continuous improvement, integrating security reviews into CI/CD, and maintaining a defensible security posture across product portfolios.

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