Excel Project Estimation to React Web App

I need a skilled web developer to convert a complex Excel workbook I currently use for project estimation into a React-based web application. This workbook includes intricate calculations and formulas, multiple macros, and is designed to generate Word proposals.

Key Tasks:
- Build a web-based application using React.js
- Implement complex calculations and formulas
- Incorporate multiple macros
- Create a feature for Word document generation to produce project proposals
- Design a user-friendly interface that simplifies the usage of the original Excel workbook
- Implement user authentication and authorization for secure access.
- Integrate a database to store project data and track changes over time.
- Add error handling mechanisms for calculations and data inputs.
- Optimize the performance for faster load times and efficient calculations.
- Provide export options for different formats such as PDF and CSV.
- Ensure the web application is responsive and works across various devices.
- Include version control for tracking changes and updates to the estimates.

The ideal candidate will have:
- Extensive experience in web development, particularly with React.js
- Proficiency in translating Excel functionalities into a web application
- Ability to create complex calculations and macros
- Experience with integrating Word document generation into a web app

I can share the current Excel workbook as a guide. The goal is to move away from Excel, so the application should be robust and user-friendly.

The user interface should have a corporate and professional design. Prioritize visualization of data in the user interface design.