Saas Project Enhancements

I'm seeking an experienced developer to make several enhancements to my SaaS project.

Key Tasks:
- Improve the design and functionality of the registration and login forms.
- Design improvements: Change layout; form must be linked to MongoDB database.
- Functionality enhancements: Please propose improvements.
- Connect to MongoDB database.
- Integrate Stripe for subscription payments.

Ideal Skills & Experience:
- Strong expertise in MongoDB and database integration.