Secure Web App Development

I'm developing a web app that is expected to handle a high volume of users. While the app is simple in design, security is my top priority.

Key Requirements:
- Implement robust security measures, especially around user authentication, to protect against unauthorized access.
- Ensure secure data transactions and safeguard administrative access.
- Integrate two-factor authentication for added security.
- handle AWS. Monitor and update as needed.
- trust

Ideal Skills and Experience:
- Expertise in web app security protocols
- Experience with two-factor authentication systems
- Strong background in securing data transactions and administrative access

Looking for a professional who can ensure my app is secure and ready for launch.