Custom Business Applications Development

I'm seeking a seasoned Power Apps developer capable of creating bespoke business applications.
The main goal of this project is to design an application with specific functions, including financial form creation.
Filled up forms will go through the approval process, and accordingly, mail should be triggered considering form approval or rejection.
After approval automatically data should move to appropriate finanical system.
The end user should see the stage of the transaction in the process flow.

Key Requirements:

ability to code financial forms for entering the data
- Implement features to trigger emails
- Experience in data integration
- Show state of transaction at any point of time
- Proven past experience in Power Apps development

Please, when applying, showcase your past work related to the task and elaborate on how you implemented similar functions.
Your skill set and demonstrated experience are crucial for this project.