There is another company https://scale.jobs/ which does what you described. They have a chrome extension which you use to delegate jobs to them on linkedin and they apply for you. It effectively adds an easy apply button to every job.

To speed up job applications that you do yourself I would recommend https://simplify.jobs/. Their application autofiller is free and performs well on workday in my experience

Do you find linkedin sufficient for finding jobs? Or do you typically check company career pages too?