Next-gen software development involves complex architecture with multiple external libraries and SaaS platforms, rapidly emerging AI tooling for code generation, and distribution across multiple cloud environments and geographic locations. Balancing people, processes, and tools is crucial to address these challenges, including shared responsibility between development and security teams through a DevSecOps approach. A proactive approach to security can foster better relationships between teams, involve threat modeling, remediation methodologies, and shifting left cultures that emphasize security by design. Measuring AppSec success involves tracking key metrics such as security training implementation, security testing coverage, critical/high vulnerability testing, time to patch/time to remediate, and number of security automation. These measurements can also tie back to business KPIs, highlighting the importance of continuous security and developer-friendly practices in next-gen software development.