Excel to Desktop Construction Pricing App

I need an experienced developer to convert my Excel sheet, which is used for pricing construction projects, into a desktop application. Additionally, I want this application to be compatible with both iOS and Android.

Key Features:
- Input and calculation of pricing
- Generation and exporting of reports
- User authentication system

Ideal Skills:
- Proficient in desktop and mobile app development
- Experienced in creating user authentication systems
- Skilled in generating and exporting reports from applications
- Familiar with pricing algorithms for construction projects.