MVP Mobile App for Tradespeople Scheduling, Invoicing, Simple AI

I’m looking to build a simple MVP mobile app for tradespeople.
The goal is to create a clean, easy-to-use app that helps manage day-to-day work and scheduling.
Core features:
Job scheduling calendar
Customer database
Quotes and invoices
Notifications/reminders
I would also like basic smart suggestions (e.g. highlighting gaps in the diary or overbooked days).
This is an MVP to test the idea, so I want to keep it simple, scalable, and cost-effective.
Please include in your proposal:
Similar apps you’ve built
Suggested tech stack
Estimated cost and timeframe
If the MVP is successful, there will be further work to develop the full app.
Looking forward to hearing from you.