Commercial GPS Tracking Platform Development

I’m building a commercial GPS tracking platform.
Hardware is already finalized (Teltonika-class devices).

Scope (non-negotiable):

Mobile app (Android mandatory, iOS preferred)

Web admin dashboard

Real-time tracking (live location, history playback)

Device management (add/remove/assign)

Alerts: ignition on/off, geofence, overspeed, power cut

User roles (admin, reseller, customer)

Scalable backend (multi-tenant from day one)

Clean UI — functional, not fancy

Technical expectations:

Experience with GPS protocols (Teltonika, TCP/UDP, or similar)

Backend: Node / Python / Java (justify your choice)

Frontend: Flutter / React / React Native (again, justify)

Proper database design (this is not a toy app)

API-first approach

Code must be maintainable and documented

What I don’t want:

Beginners learning on my project

“I can do anything” profiles with no GPS proof

Over-engineered nonsense or copy-paste clone apps

What I want from you:

Relevant GPS tracking projects (links or screenshots)

Your proposed tech stack (with reasoning)

Timeline with milestones

Fixed price or clear phase-wise costing

Post-launch support plan

This is a startup-level product with long-term potential.
If you deliver well, this won’t be a one-off job.

Apply only if you’ve actually built GPS/IoT systems before.