Custom IoT Door Lock System Development

I'm in need of a seasoned developer capable of designing and constructing a tailored IoT door lock system. This system must be secure, intuitive, and able to interface with APIs for remote operation, surveillance, and administration.

Key aspects of the project include:
- A hardware-based control mechanism utilizing API calls
- A mobile app exclusively for personal door access
- Development of a cross-platform (iOS & Android) mobile application

The ideal candidate for this project should have:
- Extensive experience with IoT hardware and software development
- Proficiency in cross-platform mobile app development
- A strong understanding of API integration
- A commitment to creating secure and user-friendly systems.