PowerApp Integration and Modification

I need a PowerApp expert to make small changes and integrate it with another system.

Key Requirements:
- Modify existing PowerApp
- Integrate with a custom-built system
- Call a custom connection upon order confirmation
- Send confirmed order details to an inventory system

Ideal Skills and Experience:
- Proficiency in Microsoft PowerApps
- Experience with system integration
- Familiarity with creating and managing custom connections
- Strong problem-solving skills

Please provide past work and relevant experience.