PKP OJS Workflow Customization

I'm seeking a PHP expert to customize the PKP Open Journal Systems (OJS) for me. The primary modification needed is on the publication process to enhance metadata management.

Key Requirements:
- Modify the publication process workflow
- Enhance metadata management capabilities

Ideal Skills & Experience:
- Expertise in PHP and PKP OJS
- Experience with workflow modification in OJS
- Strong understanding of metadata management

Please provide examples of similar work done and your approach to this customization.