Web App Development for User Management and Messaging

I'm looking for a skilled developer to build a web application for end users. The frontend is already created; I need a backend that supports the following functionalities:

User Profile Management:
- Edit profile details
- Profile picture upload
- Account settings
- Vendior Managment

Messaging System:
- Real-time chat
- Message notifications

Ideal Skills and Experience:
- Strong experience in backend development
- Proficiency in building user profile management systems
- Expertise in implementing real-time messaging features
- Familiarity with analytics dashboards is a plus

Please provide examples of similar work done.