Web-based Parking operations system with a driver app/PWA.

Hi,

I already have an airport parking booking/admin system in place and I do NOT want to replace it.

I want to modernise the operational side of the business by adding a mobile driver app/PWA and live operations dashboard that integrates with my existing system/database.

Current system already includes:

* bookings
* worksheets
* customer details
* flight details
* vehicle details
* printable handover forms

What I need built:

1. Driver mobile app / PWA
Must work on:

* iPhone
* Android
* tablets

Drivers should be able to:

* log in
* view assigned jobs
* update live job status
* open booking details
* complete digital handover forms
* upload vehicle photos
* capture customer signature
* record mileage/fuel/damage notes
* mark jobs completed

2. Digital handover form
I want my existing carbon-paper vehicle handover form digitised.

Requirements:

* same/similar layout as current paper form
* customer signs directly on phone
* photos attached to booking
* timestamp + GPS recorded
* PDF automatically generated
* copy emailed/SMS to customer
* admin can download later

3. Live operations dashboard
Replace printed nightly worksheets with a live dashboard.

Features:

* today’s arrivals and returns
* real-time updates
* assign jobs to drivers
* filter by terminal/status/driver
* colour-coded statuses
* live job tracking

Statuses:

* awaiting
* dispatched
* customer arrived
* collected
* parked
* requested
* returning
* completed

4. Vehicle and key tracking
Need ability to record:

* parking bay/location
* key cabinet number/location
* which driver moved vehicle
* movement timestamps

5. Customer communication
Automatic SMS/WhatsApp updates:

* booking confirmation
* arrival instructions
* driver on way
* vehicle collected
* return instructions

6. Flight tracking
Monitor inbound flights and flag delays/early arrivals.

IMPORTANT:
I want this integrated with my existing booking platform/database rather than building a completely new booking system.

Ideally built as:

* web app / PWA
* mobile-friendly
* works from iPhone home screen
* cloud-based
* scalable for multiple drivers/admin users

Please advise:

* best tech stack
* whether API/database integration is possible with my current system
* estimated build time
* estimated cost
* ongoing hosting/maintenance requirements