Modern Rooftop Garden Design

I'm looking for a architect/designer to create a modern rooftop with seating area and garden on my property. The garden should include:

- A seating area
- Raised planters
- A shaded workout area

I'm particularly interested in incorporating flowers, herbs and vegetables as the main types of plants.

Ideal Skills and Experience:
- Proven experience in landscape design, particularly for rooftops
-Layout designing
- Strong knowledge of modern design aesthetics
- Ability to integrate functional spaces, like workout areas, into garden designs

Please provide a portfolio showcasing similar projects.