SIM-based Call CRM Development

I’m looking to develop a full-featured CRM system with SIM-based calling, modeled closely after TeleCRM. The system should be built with three user roles: Admin, Sales Manager, and Telecaller, and include both a web admin panel and an Android mobile app for telecallers.

Key Features:

Login & Access Control:

- Company-assigned credentials for login
- Role-based access:
Admin > Sales Manager > Telecaller

Sales Manager Panel (Web):

- Add/manage telecallers
- Allocate leads to team members
- Real-time call log view (answered, missed, busy, etc.)
- Lead status tracking
- Campaign management with A/B testing (tags, segmentation)
- Performance reports:
- Calls made
- Conversion rates
- Call durations
- Filters: lead status, tags, telecaller
- Add notes and schedule follow-ups
- Export reports (CSV/Excel)

Telecaller Android App (SIM-Based Calling):

- Call assigned leads via mobile SIM
- Auto-detect call status (answered, missed, busy, rejected)
- Update lead status (e.g., interested, follow-up, converted)
- Add notes and set reminders
- Call/task history view
- Auto-sync with backend when online
- Designed for low battery and data usage

Admin Panel:

- Manage all users (sales managers & telecallers)
- System monitoring and data oversight
- Database export/import tools
- Assign limits/credits (if needed)
- Global system settings

Additional Functionalities (Similar to TeleCRM):

- Lead tagging and segmentation
- Custom call outcomes and lead statuses
- Campaign-based reporting (for A/B testing)
- Missed call recovery feature
- Bulk lead upload via Excel
- Daily task checklist for telecallers
- Call performance dashboard (e.g., conversion ratio, follow-up trends)
- Push notifications for new leads

Ideal Developer/Team Should Have:

- Experience in building SIM-based call apps
- Strong backend + frontend web experience (React, Vue, or similar)
- Familiarity with Firebase or REST APIs for real-time sync
- Proven UI/UX skills for admin and mobile interfaces
- Understanding of CRM workflows and performance tracking

Deliverables:

1. Admin Panel (Web)
2. Sales Manager Panel (Web)
3. Telecaller App (Android - SIM Based)
4. Database with real-time sync and lead management
5. Reporting, export, and push notification system

Please Include in Your Proposal:

- Timeline and budget estimate
- Relevant past work or demo links
- Technology stack you propose
- Questions you have or suggestions for improvement

Let me know if you're the right fit! Looking forward to your proposal.