BLE Beacon Content Display App

I'm looking to develop an app for both iOS and Android that interacts with Bluetooth Low Energy (BLE) beacons from Kontakt. The app should display various types of content (text, images, videos, web pages) when users are near these beacons.

Key Requirements:
- Integrate Kontakt.io BLE beacons
- Display content based on proximity to beacons
- Support iOS and Android platforms

Ideal Skills & Experience:
- Experience with BLE technology
- Mobile app development for iOS and Android
- Familiarity with content management systems
- UI/UX design skills for a user-friendly interface

Please provide a portfolio of similar projects and an estimated timeline.