Cross-Platform Mobile App for Field Collectors

I'm in need of a proficient mobile app developer who can create a cross-platform mobile application (iOS & Android) for field collectors. This app will serve as an extension of our existing web application, pulling data from an API we will provide. Key Features: - Data Entry: Users will input text fields and numeric values into a grid format. - User Authentication: The app will require a simple username and password for user authentication. - Signature Feature: Users can sign off on submissions. - Offline Mode: Vital for field use, the app should allow data entry and creation of new lines, even without internet connectivity. Ideal Skills: - Expertise in Swift for iOS and Kotlin for Android development. - Experience with cross-platform app development. - Skills in API integration. - Knowledge in implementing offline functionality. Please note, no additional integrations are required apart from our existing API. Your main task is to ensure seamless data entry, user authentication, and reliable offline and online capabilities.