Secure and Launch Web App Planner

I need a skilled developer to check, secure, and finalize my partially developed web application planner for a go-live in early November.

Key tasks include:
- Security and launch checks for:
- User accounts, passwords, and access levels
- Data protection, backups, and privacy settings
- Live server setup, domain, and error monitoring

- Comprehensive testing:
- All main user journeys from start to finish
- Compatibility on phones, tablets, and different web browsers
- Performance under heavy user loads and large data volumes

Ideal skills and experience:
- Strong background in web application security
- Experience with user account management and data protection
- Proficiency in cross-device and cross-browser testing
- Ability to manage and monitor live server environments

Looking for someone reliable who can ensure the app is secure and fully functional before launch. Please include relevant experience in your bids.