What problem does it solve? Shipping code with hardcoded secrets, SQL injection flaws, missing authorization checks, or misconfigured cloud infrastructure leads to breaches. This Skill provides structured security checklists and code patterns so vulnerabilities are caught before deployment. ## Core Features & Use Cases - Application Security Checklist: Covers secrets management, input validation with Zod, SQL injection prevention, authentication/authorization, XSS, CSRF, rate limiting, and sensitive data exposure with PASS/FAIL code examples. - Cloud & Infrastructure Security: Reviews IAM least-privilege policies, secrets rotation, VPC/firewall rules, CI/CD pipeline hardening with OIDC, Cloudflare WAF configuration, and backup/disaster recovery. - Pre-Deployment Gates: Provides ready-to-use checklists and automated security test patterns (auth, authorization, validation, rate limiting) to run before any production release. - Use Case: Before launching a new payment API endpoint on Next.js with Supabase, run this review to verify parameterized queries, Row Level Security policies, httpOnly cookie sessions, and rate limiting are all in place. ## Quick Start Review my new API endpoint code for security vulnerabilities using the security review checklist before I deploy to production.