Fortinet Site-to-Site Setup

I need an expert to configure a FortiGate device for site-to-site connectivity to connect our branch offices. This setup should also include multiple VLAN configurations.

Key Requirements:
- FortiGate configuration for site-to-site connectivity
- Multiple VLAN configurations

Ideal Skills and Experience:
- Proficiency with FortiGate devices
- Experience in configuring site-to-site VPNs
- Knowledge of VLAN setup and management
- Familiarity with branch office connectivity solutions

Please provide relevant experience and approach.