Software engineers and security architects must master the secure software development lifecycle by integrating rigorous threat modeling, risk assessment, and vulnerability management throughout the CI/CD pipeline. Proficiency requires applying OWASP Top 10 mitigation strategies to mitigate injection, broken access control, and cryptographic failures within web applications. Candidates implement secure coding standards using frameworks like Spring Boot or .NET while leveraging SAST, DAST, and SCA tools to automate security testing. Mastery includes hardening API endpoints, enforcing OAuth 2.0 and OpenID Connect protocols for identity management, and securing cloud-native architectures against common exploit vectors through infrastructure-as-code security audits and comprehensive input validation techniques.