Comprehensive Construction Management System

I need a robust system to manage my construction projects, employees, and partners all in one place. This will include both a website and mobile apps for iOS and Android.

Key Features:

- Employee Management: Primarily focusing on tracking work progress on solar construction sites.
- Project Management: This is the most critical aspect of the system. I need a user-friendly interface for creating, editing, and monitoring projects.
- Partner Management: Partners should have the ability to add and manage their own employees and projects. The system should automatically calculate costs for invoices from each partner, and send them automatically upon project completion.

Employee Specifics:

- Construction Calendar: A schedule for solar construction sites.
- Project Information: Details on AC (electrical) and DC (roof) construction, including photos and tasks.
- Photo Upload: Employees must upload all photos to confirm project completion.
- Construction History: A record of all past projects.
- Wages: Current pay rates and earnings.

Partner Specifics:

- Employee Addition: Partners should be able to add their own workers.
- Project Management: Partners should be able to create, edit, and manage their own projects.
- Billing: The system should handle all invoicing and cost calculations.

Additional Features:

- Service Requests: A function for reporting service issues.
- Mobile App: A fully functional mobile application for both iOS and Android.

Ideal Skills and Experience:

- Proven experience in developing comprehensive management systems.
- Strong skills in both web and mobile app development.
- Familiarity with construction management software.
- Excellent understanding of project tracking systems.
- Ability to create an intuitive user interface.

I need FRONT END BACK END and all :D