Web App for Excel Task Automation

I'm looking for a skilled web developer to create a web application that automates several tasks related to Excel. The app should handle:

Data Analysis and Visualization:
- Generate charts and graphs
- Create pivot tables
- Perform trend analysis

Automated Calculations:
- Execute standard arithmetic operations

Data Import/Export:
- Seamlessly import and export data

Ideal Skills and Experience:
- Proficiency in web development
- Strong background in data analysis
- Experience with Excel and automation tools
- Knowledge of data visualization libraries

Please provide examples of similar work done.