Subcontractor Workflow Management Database

I need a project management database system to track subcontractor workflows. This system will be used by about 15 employees.

Key Features:
- Estimate tracking
- Contract tracking
- Bonding management
- Insurance oversight
- Licensing checks
- Materials approval
- Materials ordering
- Materials delivery to job site
- Billing
- Certified payroll
- Project management tasks
- Job closeout
- Document Management

Requirements:
- Desktop application
- Windows compatibility
- Basic features needed quickly, with additional features rolled out over time

Ideal Skills & Experience:
- Database development
- Desktop application development, especially for Windows
- Experience with project management systems
- Ability to implement features in phases

Please provide examples of similar work done.