Crypto currency software as a service system -- 2

I am looking for a freelancer to develop a crypto currency software as a service system with the following requirements:

Features:
- Exchange functionality

Technology stack:
- I trust the freelancer's judgement for the programming language and technology stack to be used

User interface design:
- Basic, functionality-focused

Ideal skills and experience:
- Experience in developing crypto currency software
- Knowledge of exchange functionality and integration
- Strong understanding of user interface design and functionality
- Smart contract that connects to my dao system
Please provide your portfolio showcasing relevant projects and your approach to developing a crypto currency software as a service system.