Custom Bluetooth Relay Control App

I'm looking for an experienced mobile app developer to create a custom app for iOS and Android. The app will control a 2-channel Bluetooth relay primarily for home automation.

Key features include:
- Remote access to control the relay
- User authentication (method to be discussed)

Ideal skills and experience:
- Proficiency in Bluetooth connectivity
- Experience in developing cross-platform mobile applications
- Strong background in implementing secure authentication methods
- Familiarity with home automation systems

Please provide examples of similar work done.