Property Rental Admin System Setup

I'm looking for an experienced admin to set up a comprehensive property rental system. This system needs to manage tenants, process rent payments, and handle property listings. It should be accessible on web, mobile app, and desktop software.

Key Requirements:
- Tenant Management: Add, update, and remove tenant information.
- Rent Payment Processing: Securely process and track rent payments.
- Property Listing Management: Create and manage property listings.

Ideal Skills and Experience:
- Experience with property rental systems
- Proficiency in web and mobile app development
- Strong organizational skills
- Prior experience in tenant management systems.

Please provide your portfolio and any relevant experience.