Is blogging experience (on medium) relevant on the CV for PhD CS Admissions? (US)
Almost any experience is useful on a CV, provided that you can link it to the job you are applying for in a sensible way (this is nearly always possible). It is likely that all candidates have similar diplomas, so the &quot;extra&quot; things you did besides your degree are very valuable. Being able to demonstrate that you are a skilled technical writer and science communicator will almost certainly help.
Mentioning &quot;medium&quot; by name has no value (see also below), but the fact that you have written well received articles on a weblog will improve your CV.
There is a good chance that the hiring committee does not know &quot;medium&quot;, and if they do, they probably know that a lot of very bad articles are published on medium (as well as some good ones). If you get through a first screening the hiring committee could be interested in reading your articles to see if they are any good: it would help to provide them with a link to the list of articles.