Power BI Sales Dashboard Creation

I need an experienced Power BI developer to create a dynamic sales dashboard. The data will be sourced from Excel files, specifically sales transactions.

Key Requirements:
- Connect Excel files to Power BI
- Auto-update data daily
- Visualize metrics:
- Total sales
- Sales by region
- Sales by payment mode
- Differences between sales and collections

Ideal Skills and Experience:
- Proficiency in Power BI
- Strong Excel skills
- Experience with sales data visualization
- Ability to set up automated data refresh

Please provide samples of previous work and an estimated timeline.