Integrated Restaurant and Construction Management Systems Development

I need an experienced developer to create an integrated management system for both a restaurant and a construction business.

The system should include:

Restaurant Management System
- Stock Management: Track inventory, manage suppliers, and reduce waste.
- Account Management: Handle all financial transactions, budgeting, and reporting.
- Employee Payroll: Manage employee salaries, benefits, and tax deductions.

Construction Management System
- Stock Management: Similar to the restaurant, but tailored for construction materials.
- Contractor Work Assignment: Assign tasks to contractors and track their progress.
- Construction Site Management: Oversee various sites, manage schedules, and ensure safety compliance.
- Employee Payroll: Same as in the restaurant system, but for construction workers.

The ideal candidate should have:
- Proven experience in developing complex management systems.
- Strong knowledge of both restaurant and construction industry workflows.
- Skills in database management, UI/UX design, and backend development.
- Excellent problem-solving skills and attention to detail.

Please provide examples of similar projects you've completed and your approach to ensuring system security and data integrity.