Tiered Commission Calculator Development

I'm looking for a skilled developer to create 2 commission calculators based on a tiered structure and a flat rate. The calculator should determine commissions based on revenue, with three distinct tiers.

Key Requirements:
- Commission calculation based on a tiered structure
- Base criteria for tiers is revenue
- Ability to define and adjust three commission tiers

Ideal Skills and Experience:
- Experience in developing calculation tools or similar software
- Strong understanding of tiered commission structures
- Proficiency in programming languages suitable for creating interactive calculators

Please provide examples of similar work done.