Modern A4 Product Poster Design

I am looking for a modern design for an A4 size poster that is aimed at advertising a product. The design should be sleek, contemporary and appealing to the target demographic.

Key Requirements:
- Design of A4 size poster
- Focus on product advertisement
- Use of a modern style

Ideal Skills and Experience:
- Graphic design
- Poster design
- Product marketing
- Modern design aesthetic