Service Marketplace App (Customer + Worker + Admin Panel)

I want to build a service marketplace app similar to Sheba/Urban Company.

Structure:
Category → Sub‑Category → Service (service is the base unit)

Main Modules:
1) Customer App
2) Worker App
3) Admin Panel (Web)
4) Backend + Database + APIs

Core Features:
- Category/Sub‑Category/Service listing
- Fixed & Variable Pricing Engine
- Fixed & Variable Time Calculation
- Booking System
- Worker Matching (primary + extended radius)
- Payment Integration (bKash/Nagad/SSLCommerz)
- Big Job Module (inspection + verification)
- Notifications
- Service activation/deactivation
- Promo support

Admin Panel:
- Add/Edit Category, Sub‑Category, Service
- Set price type (fixed/per_sqft/per_room/per_unit)
- Set base price, min/max price, base unit
- Set time type (fixed/variable)
- Set base time + extra time
- Materials cost, urgency fee, worker level fee
- Service status control

Deliverables:
- Customer App (Android)
- Worker App (Android)
- Admin Panel (Web)
- Backend + Database
- Full source code

Looking for:
- Flutter/React Native developer
- Strong backend experience (Node/PHP/Laravel)
- Clean UI/UX
- Fast communication
- Can work 3–4 hours/day

Budget: $500 - $800
Please share your best price and timeline.