need to fix some bugs in my custom WordPress book creator Plugin

I need a highly skilled WordPress developer to assist with debugging and enhancing a custom plugin I'm developing. This plugin is designed to generate book chapters and content, convert it into PDFs, and send data to Lulu.

Key Requirements:
- User Authentication & Session Management: All registered users should be able to log in and have their progress saved.
- Custom PDF Generation: Users can generate PDFs with customizable options.
- Integration with Third-Party Services: Seamlessly send data to Lulu.
- User Interaction: Users should be able to resume from any step if they leave midway.

Ideal Skills and Experience:
- Expertise in WordPress plugin development
- Strong understanding of user authentication and session management
- Experience with PDF generation and third-party API integration
- Proficient in debugging and reading existing code

Please provide examples of similar work done.