Social Media Graphics Design

I'm looking for a skilled graphic designer to create engaging visuals for our social media platforms, specifically Instagram, Facebook, and Twitter.

Requirements:
- Instagram: Posts, Stories, and Highlights Covers
- Facebook: [To be specified]
- Twitter: [To be specified]

Ideal Skills and Experience:
- Proven experience in social media graphic design
- Proficiency in design software (e.g., Adobe Photoshop, Illustrator)
- Strong portfolio showcasing previous work
- Ability to create visually appealing and on-brand graphics
- Understanding of each platform's dimensions and requirements

Please provide samples of previous work and a brief proposal.