Modern Software Redesign & Payment Integration -- 2

I'm seeking an experienced developer to give our software a modern, minimalist look and feel. The current software is built on core PHP and requires both a redesign of the user interface and improvement of the user experience.

Key requirements:
- Both UI and UX redesign
- Integration of a payment gateway (options to be discussed)
- Modern and minimalist design aesthetics

Ideal skills and experience:
- Proficiency in core PHP
- Strong portfolio in modern UI/UX design
- Experience with payment gateway integration
- Ability to collaborate and communicate effectively throughout the project

Please provide examples of previous work and a breakdown of your approach to this project.