Loan Management System Backend Upgrade

I have a loan management website that needs some backend functionality improvements.
Key Requirements:
- Database optimization
- Overhauling some basic functions

Specific Issues to Address:
- Complete Loan rows need to transfer to the 'complete' manager
- Two non-functional buttons that need fixing

Ideal Skills:
- Strong experience in backend development
- Expertise in database optimization
- Familiarity with loan management systems

Please provide a detailed proposal including relevant past work experiences.