Secure SaaS Financial Tracking Web App

I need a top-tier, highly secure SaaS web application developed using Python and other open-source frameworks. The software serves primarily to track financial data, specifically income and expenses equally.

Key Requirements:
- Customer Management: While the main purpose is financial tracking, the software should also incorporate a robust customer management system.
- Invoicing and Quotes Handling: The app should efficiently manage invoices and quotes, ensuring seamless business operations.
- Financial Tracking: The core of the software is to monitor both income and expenses meticulously.

Security Features:
- The app must have two-factor authentication to enhance security.
- Data encryption is a must to ensure all sensitive information is protected.
- Regular security audits should be incorporated to maintain high security standards.

Ideal Skills:
- Extensive experience in Python and open-source frameworks.
- Proven track record in developing SaaS apps.
- Strong understanding of financial tracking software.
- Expertise in implementing high-security features in web applications.

The quality of the application is paramount, hence I am looking for a freelancer who can deliver a high-quality product.