Freestanding Concrete Deck Footings Design

I'm looking for a professional to design footings for a freestanding deck. The footings need to be made of concrete and must be suitable for clay soil.

Requirements:
- Design must accommodate a freestanding structure
- Use concrete as the primary material
- Soil condition and stability must be considered (clay soil)

Ideal Skills and Experience:
- Experience in structural or civil engineering
- Expertise in designing footings for various soil types
- Familiarity with building codes and regulations

Please provide your portfolio and relevant experience.