Playful & Colorful Logo & Banner Design

I'm in need of a logo, app store and playstore image, and banner design that embodies a playful and colorful aesthetic. The designs should be modern and minimalistic, with a variety of colors used throughout. While there's no specific color palette to stick to, I would like the designer to be creative and use a variety of colors in a harmonious way.

Ideal skills for this project include:
- Graphic design
- Banner design
- Logo creation
- App and Playstore image design
- Understanding of modern, minimalistic and playful design principles
- Proficiency in using design software like Adobe Illustrator, Photoshop, etc.

Please provide a portfolio of similar work you've done in the past.