Business Platform Web App Development

I'm seeking an experienced web application developer to create a comprehensive business platform. The application will primarily display company information and will need to integrate several key features.

Key Features:
- Quotation system
- Customer orders management
- Supplier orders tracking
- Delivery and invoicing system

Ideal Skills and Experience:
- Proficiency in web application development
- Experience with database management
- Strong understanding of UI/UX design principles
- Familiarity with order and invoicing systems
- Ability to ensure data security and integrity

Please provide examples of relevant past work and a brief outline of your approach to this project.