Source Code Review is a comprehensive and systematic evaluation of an application’s source code to identify security flaws, design-level vulnerabilities, and insecure coding practices that may not be visible during runtime or penetration testing. It examines the entire codebase, including business logic, authentication and authorization mechanisms, session management, input validation, cryptography usage, error handling, and third-party library dependencies. The process typically combines manual code analysis by experienced security professionals with automated static analysis tools to uncover subtle logic flaws, insecure patterns, or potential backdoors. It ensures that coding practices adhere to security standards and regulatory requirements and helps organizations detect vulnerabilities early in the Software Development Lifecycle (SDLC) before deployment. Source Code Review also evaluates how the application handles sensitive data, API calls, and interactions with other services, ensuring secure integration and robust defensive coding. The methodology aligns with globally recognized standards such as OWASP ASVS, OWASP Top 10, SANS Top 25, NIST SSDF, and CERT-In guidelines, making it suitable for enterprise, government, and compliance-driven projects.