Indoor Navigation System Development

Hi, I’m looking for a developer/team who can help us build a **real-time indoor navigation system**.

The main requirement is:

* Convert existing **CAD/PDF/floor plans into a structured 2D/3D indoor map**
* Support **multiple floors**
* Implement **BLE beacon-based indoor positioning**
* Use **BLE + accelerometer + gyroscope + compass** for accurate positioning
* Show the user’s **real-time location and direction** on the map
* Provide **turn-by-turn indoor navigation**
* Calculate the best route between two points
* Support **stairs, elevators, escalators, gates, corridors, rooms, etc.**
* Provide **dynamic rerouting** if the user moves away from the planned route
* Develop the navigation engine/API/SDK so it can later be integrated into an **Android application**

This is intended for a large indoor environment so accuracy, scalability, multi-floor navigation, and real-time positioning are important.

Please let me know:

1. Have you worked on similar indoor navigation projects?
2. What technology/SDK would you recommend?
3. How would you implement BLE positioning?
4. What accuracy can you realistically achieve?
5. What information/data would you need from our side?
6. Estimated development timeline and cost?

I can share the detailed technical requirements and floor plans once we confirm the approach.