On the Post to Job Boards page for any job posting, you can take advantage of the social media sharing icons to promote your job posting on LinkedIn, Twitter, Google+, and Facebook. Learn more here.
When you share a job posting via the LinkedIn sharing widget, LinkedIn will pull in the logo that has been uploaded to your hosted careers page. In order to optimize the appearance of your logo image on a LinkedIn job posting share, here are the logo size specifications that LinkedIn recommends.
Maximum file size: 1 MB
Minimum image dimensions: 80 x 150 pixels
Recommended aspect ratio: 4:1 or 1:4