Modern Sloping Home Design in Auckland

I'm seeking an experienced architect to design a modern family home on a sloping lifestyle section in Auckland. The design should maximize the unique topography and incorporate the following key spaces:

- Open-plan living area
- Home office
- Entertainment room
- Guest wing

The home should feature 4 bedrooms.

Ideal Skills and Experience:
- Expertise in modern architectural design
- Experience with sloping site constructions
- Strong understanding of functional, family-oriented layouts
- Proven portfolio of residential projects

Please provide a portfolio and relevant project experience.