Your question is Secure a Web Application Rollout. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You are preparing a customer-facing web application for broader release and want to reduce exposure to common vulnerabilities before traffic scales. The application includes authenticated user flows, public forms, APIs, and third-party integrations, so security gaps could affect both customer trust and business continuity.
How would you secure a web application from common vulnerabilities?