Logistics Tracking App Revamp

I'm seeking a skilled mobile app developer to create a second version of our Android and iOS logistics tracking app. The app should: - Incorporate GPS tracking - Prevent the OS from putting the app to sleep while an active shipment is in progress (It needs to update our system of its location every X miles traveled or hourly) - Integrate with our internally developed proprietary software's API (Read and write access) The ideal candidate will have extensive experience in mobile development and integrating apps with complex systems. Familiarity with logistics and tracking systems will be a significant advantage. In addition, I would like to discuss the management of our mobile development accounts. If you have experience in this area, please highlight it in your proposal.