Excel-Based App Development

I need an app developed for both iOS and Android platforms, based on an Excel sheet. The app should import data from a .txt file and include a search function.

Key Requirements:
- Data calculations and summaries from the Excel sheet
- Import data with search functionality from a .txt file

Ideal Skills and Experience:
- Experience in app development for iOS and Android
- Proficiency in data handling and calculations
- Ability to create efficient search functions

Please submit detailed project proposals.