Modern Graphic Design for Product Promotion

I'm in need of a modern graphic designer to create visually appealing posters and flyers for product advertisement. The designs should be suitable for both online and print media. The ideal freelancer for this project should have:

- Proficiency in modern design principles
- Experience in creating designs for product promotion
- Ability to create designs suitable for both online and print media

Please provide a portfolio showcasing your previous work in this style and for this purpose.