Traditional find-and-fix AppSec approaches often fail at scale because they are reactive and cannot tackle vulnerabilities at their source. OWASP FIASSE flips this script with a developer-centric approach to product security that views security from the builder's side, preventing weaknesses that can become vulnerabilities. By addressing security though software engineering attributes and principles, FIASSE lightens the load on security teams and prevents rework, saving time and effort. We will discuss how you can make this framework work for you.