Advanced WordPress CMS Development Needed

I am seeking an experienced WordPress developer to join our large-scale project aimed at creating a highly scalable and modular content management system (CMS) for our expanding digital platform. This project involves deep customization beyond typical WordPress capabilities, especially on the PHP backend, to support dynamic content types, custom workflows, and advanced user role management.

Key Requirements:
- Develop a scalable and modular CMS using WordPress
- Customize PHP backend to support dynamic content types
- Implement custom workflows, including in-dashboard notifications
- Trigger notifications for user role changes
- Overcome limitations of default post types and plugin conflicts
- Address performance bottlenecks while maintaining WordPress flexibility

Ideal Skills and Experience:
- Extensive experience in WordPress development and PHP customization
- Strong understanding of enterprise-level content structures
- Proficiency in creating custom workflows and user notifications
- Ability to manage complex user permission systems
- Experience in optimizing WordPress for performance and scalability

If you have the expertise to tackle this complex challenge and help us push the boundaries of WordPress, I would love to hear from you.