Cross-Platform ESP32 BLE Mobile App Development

I need a mobile app developed for both iOS and Android platforms, designed to interface with an ESP32 via Bluetooth Low Energy (BLE). The app will function like a BLE serial connection, allowing data to be sent and received as strings.

Key Features:
- Interface Elements:
- Buttons
- Text input bars
- BLE searching page

- BLE Functionalities:
- Reconnecting automatically
- Secure data transmission

Ideal Skills and Experience:
- Experience in mobile app development for both iOS and Android
- Proficiency in BLE communication and protocols
- Strong UI/UX design skills to create an intuitive user interface
- Knowledge in implementing secure data transmission

Please provide a portfolio showcasing similar projects and your approach to ensure secure data transmission and automatic reconnection.