Bespoke QBO-based Accounting Package

I need a custom accounting package based on QuickBooks Online (QBO). I've used ChatGPT to help outline the requirements, but I need someone to piece it all together and troubleshoot.

Essential Features:
- Invoicing and billing
- Expense tracking
- Financial reporting
- Quoting
- GST
- Receive payments
- Integration with banking software

Ideal Skills and Experience:
- Strong familiarity with QuickBooks Online
- Experience in developing custom accounting solutions
- Proficiency in integrating banking software
- Problem-solving skills for troubleshooting

Please reach out if you need additional information as I have a few other things we need to go over like not using bank feeds and using .csv's instead.... Thank you