Modern Advertisement Billboard Design

I'm seeking a professional designer to create a billboard for advertisement purposes. The target audience is the general public, so the design needs to be visually engaging yet not overly complicated.
Key design requirements:
- A modern and sleek style
- Clear and compelling communication of the advertisement's message

Ideal candidates should have:
- A strong portfolio of billboard and outdoor advertisement design
- Proven experience targeting general audiences
- Exceptional understanding of modern design principles.