Full-Stack Developer for AI-Powered Dispatch & Service Management App (React Native + Firebase)

We are developing SpaSync, a dispatch and service management platform built specifically for the hot tub and spa industry. The app is designed to streamline route optimization, technician scheduling, warehouse inventory management, and real-time performance reporting. The foundational assets for the project are already complete, including:
• Full UI/UX mockups for dispatcher and driver views
• Finalized app name and branding
• Feature flowchart and detailed functionality spec
• Development roadmap and milestone schedule
• Pitch deck and investor presentation
• Requirements for multilingual toggle, voice control, and barcode scanning

We are now seeking a developer or small development team to build the MVP and prepare the app for testing in a real business environment.
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Scope of Work:
We are looking for a highly capable developer to take the project from design to deployment of the MVP (Minimum Viable Product). Your responsibilities will include both front-end and back-end development and integration with AI and mapping tools.
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Responsibilities:
• Develop the front-end using React Native for both iOS and Android
• Build and configure the backend using Firebase (Firestore, Auth, Realtime Database, Cloud Functions)
• Integrate GPT-4 API (OpenAI) for intelligent dispatch suggestions and driver support
• Implement route optimization using Google Maps API, Mapbox, or a comparable routing tool
• Build warehouse inventory tracking with barcode scanning capability
• Create toggles for multilingual support (English and Spanish)
• Integrate voice instruction capabilities for driver and dispatcher interfaces
• Build an earnings dashboard and performance reporting module
• Configure user roles and secure login (dispatcher, technician, admin)
• Ensure clean, scalable, and modular code suitable for long-term development
• Optional: Assist in deployment to App Store and Google Play

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Preferred Tech Stack:
• Frontend: React Native, Redux (optional)
• Backend: Firebase (Firestore, Auth, Hosting, Cloud Functions)
• AI Integration: GPT-4 (OpenAI API)
• Mapping & Routing: Google Maps API or Mapbox
• Additional: Stripe (for future payment modules), barcode scanner plugin
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You Will Be Provided With:
• Full clickable UI mockups for all app sections
• Branding and visual assets
• Clear documentation of user flows and app logic
• Dispatcher and technician user personas
• Development roadmap and task breakdown
• Investor materials to understand long-term vision
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Timeline and Compensation:
• Target delivery of MVP: 30–45 days
• Budget range for MVP: $3,000 – $7,500 depending on experience and deliverables
• Long-term partnership potential if MVP meets expectations
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Bonus Experience (Not Required, But Preferred):
• Dispatch, logistics, or field service app development
• SaaS platform development
• Experience with AI-driven workflows or voice assistance
• Familiarity with inventory systems or route management tools
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How to Apply:
When submitting your proposal, please include:
1. A brief summary of your relevant experience
2. Links or screenshots of 2–3 similar apps you’ve built
3. Your proposed tech stack
4. Estimated time and cost to complete the MVP
5. A brief explanation of how you would handle route optimization

I have attached some pictures that I had AI create of how I think the app should look and run