Excel formula required to present data in a heat map

I am looking for a freelancer who can create an Excel formula to present data in a heat map. The data is a mixture of groups, dates, and scores needed to present a month view. I have a specific color scheme in mind for the heat map and would like the freelancer to follow it. The Excel file format preferred is .xlsx (newer version).

Ideal skills and experience for the job include:
- Advanced Excel skills
- Experience in creating heat maps in Excel
- Knowledge of color schemes and visualization techniques
- Attention to detail and ability to meet deadlines