Field Service Technician Report App

I'm in need of a mobile application to help my field service technicians in logging their work details. This application will be the primary tool for recording hours worked, parts used, and maintaining customer information. We currently use an excel spreadsheet.

Key Features:
- Hours Tracking: The app should allow technicians to log their working hours efficiently.
- Parts Lists: The app should have a feature that helps in maintaining a list of parts used during service.
- Customer Table: The app should have a customer management system. Technicians should be able to view customer details and update them if needed.

Technical Requirements:
- Platform: I need this application to be created mobile devices and desktop
- Offline Compatibility: The app must have offline functionality, so my technicians can use it in remote or low connectivity areas.
- OS: The app should be developed for both iOS and Android platforms and windows

Ideal Experience:
- Experience in developing mobile apps for both iOS and Android platforms.
- Previous work in creating service or technician report tools.
- Proficiency in building offline functionality in mobile applications.