Senior Full-Stack Engineer Needed for Production Readiness & Security Audit (React/Node.js/Stripe)

I'm looking for a senior full-stack engineer to perform an independent technical audit of my SaaS application before production launch. This is NOT a feature development project. I am looking for an experienced engineer who can review the existing codebase and provide an objective assessment of its production readiness. Technology Stack • React • Node.js • TypeScript • PostgreSQL • Drizzle ORM • Stripe • Express • pnpm The application includes: • User authentication • Contractor onboarding • Client dashboard • Invoicing • Stripe payments • Background workers • Database migrations • REST APIs • Production deployment documentation I will provide the complete source code as a ZIP archive after an NDA or confidentiality agreement if requested. I would like you to review: • Architecture and code quality • Authentication & authorization • Session management • Stripe integration (Checkout, Webhooks, Idempotency) • Database schema & migrations • API security • Input validation • Error handling • Logging & monitoring • Scalability • Performance • Deployment readiness • Technical debt Deliverables: 1. Written audit report 2. Critical issues (must fix before production) 3. High-priority recommendations 4. Security findings 5. Performance/scalability observations 6. Production readiness assessment Please do NOT make code changes during the first milestone. The first milestone is a code review and written report only. If we agree on the findings, we may create a second milestone for implementing improvements. When applying, please answer: • Have you performed production audits for SaaS applications? • Have you worked with Stripe production integrations? • Have you reviewed authentication and authorization systems? • Have you audited PostgreSQL migrations? • Can you provide examples of similar audits?