RESTful API & Mail Builder Integration

I need a skilled developer to create a RESTful API that supports both JSON and XML data formats. Additionally, I require a robust mail builder with customizable functionalities.

Key Requirements:
- Develop a RESTful API
- Support for both JSON and XML
- Integration of a comprehensive mail builder

Ideal Skills and Experience:
- Proficiency in RESTful API development
- Experience with JSON and XML
- Familiarity with mail builder tools and customization

Please provide examples of similar work done.