Cross-Platform Gig Work App Development

I'm seeking an experienced app developer to create a gig work app for both iOS and Android platforms.

Key Features:
- Live updating board
- Data retrieval
- Posting functions
- Payment processing
-Basic messenger

Ideal Skills & Experience:
- Proficient in multi-platform app development
- Experience with real-time data synchronization
- Strong background in secure payment integration
- Comfortability with backend development work
- Familiarity with web, iOS and Android development environments

Looking for someone who can deliver a high-quality, reliable app within budget. Please provide examples of similar work.