Comprehensive Custom ERP Development

I need a custom ERP system to streamline several business processes. The core modules should include:

- CRM
- ERP
- Accounting
- Lead and Deal Management
- Customer and Supplier Management
- Contact Management
- Proposal and Quotes
- Purchase Orders and Service Orders
- Invoice and Payments
- Sales and Purchase
- Commission Management
- Pickup and Delivery
- Goods Received Module
- Certificates
- User Management
- Settings
- Expenses and Payouts

The system should automate:
- Sales and Purchase
- Invoice and Payments
- Inventory Management

Ideal Skills and Experience:
- Proven experience in ERP development
- Strong understanding of the listed business processes
- Expertise in automation of sales, purchases, and inventory
- Proficient in building comprehensive modules within an ERP system
- Ability to deliver a user-friendly and efficient system within budget