Create a poster for social media

I need a freelancer to create a promotional poster for my social media campaign. The poster will be used on Facebook and will focus on promoting a sale that I am currently running. The ideal candidate will have experience in graphic design and creating visually appealing social media content. The poster should be in a square format, specifically 1080x1080px. The design should be eye-catching and effectively communicate the sale's message. Please provide a portfolio of previous work.