Comprehensive EHR System Development

I'm looking for a skilled developer to create a fully functional Electronic Health Record (EHR) system tailored to our needs. The system should be robust and user-friendly, incorporating several critical functions and features.

Key Functions:
- Patient record management
- Appointment scheduling
- Billing and invoicing
- Payroll
- Documentation
- Patient portal remittance tracking
- Reporting
- Setup tab
- HIPPA Compliance

Essential Features for Patient Record Management:
- Medical history tracking is a must

User Roles:
- Administrative Staff
- Patients
- Music Therapists

Ideal Skills and Experience:
- Proven experience in developing EHR systems
- Strong understanding of healthcare workflows
- Expertise in database management and secure data handling
- Ability to create intuitive user interfaces
- Experience with role-based access control

Please provide examples of similar work done and ensure adherence to healthcare regulations and standards.