Slab-on-Grade Foundation Design for Commercial Building in Iowa

I need a professional engineer experienced in designing slab-on-grade foundations for commercial buildings. This project is located in Iowa, and I do not have any soil testing or geotechnical reports available.

Key Requirements:
- Expertise in foundation design
- Experience with commercial building projects
- Ability to design without pre-existing soil data

Please provide your portfolio of similar projects, including any relevant certifications.