Logo Design for Cashback App

I am in need of a professional and clean logo for my cashback app. The logo should incorporate a symbol or icon, but does not need to include the company name or a tagline.

Ideal candidates for this project should:
- Have a strong portfolio of modern and sleek designs
- Be able to create a unique and recognizable symbol or icon
- Understand and can implement a 'cool and calm' color scheme
- Be open to revisions based on feedback.