QuickBooks Data Integration for PowerBI

I need a freelancer to extract all data from QuickBooks Online and populate an easy to access relational database for Microsoft PowerBI use. The Freelancer will need to establish a process that pulls QBO data at recuring intervals or establish a live connection QuickBooks and writes to the database, create the database storage system, and train the contractor on maintaining the system.

Required Data:
- Sales and Invoices
- Expenses and Purchases
- Inventory
- Customer and Vendor Information

The ideal candidate should have expertise in:
- QuickBooks Online
- Relational databases
- Microsoft PowerBI
- Data integration and ETL processes

Please include examples of similar work and ensure you have the necessary skills and experience.