PDF Contract Generation with Spring Boot

I need a skilled developer to implement an endpoint in a Spring Boot application that generates a modern, minimalist invoice in PDF format from an HTML template using Apache PDFBox.

Requirements:
- Endpoint creation on Spring Boot framework
- The HTML template should be responsive and can be dynamically populated with:
- Client name and address
- Line items and total amount
- Dates and invoice number
- A basic template is available but needs a polished, professional layout.

Ideal Skills and Experience:
- Proficiency in Spring Boot and Apache PDFBox
- Strong HTML/CSS skills for responsive design
- Experience with modern, minimalist design aesthetics