Full disclosure: they sponsor my blog. But I wouldnt let them if I didnt believe in the product.
For the Linkedin apply the job board owner must login to Linkedin developer and make a new application to get it activated. Its fairly simple but involves a few steps.
Mobile apply is already enabled. Job seekers can attach their resume from a variety of cloud storage sites such as Google Drive and Dropbox. Founder, Christian Malpeli pointed out to me that they’ve actually had mobile apply live for months though it wasn’t clear. Now when you click apply on mobile the icons from the various sites appear.