If you'd like to talk to me directly, then you can email me at james dot stanier @shopify.com, ping me on Twitter @jstanier, or find me on LinkedIn: https://www.linkedin.com/in/jstanier/
Unless you have a very large following already, you're at the whim of the Medium editors to "elevate" content to the wider readership of the site, via the preexisting topics, or if you're really lucky, to feature your article on the front page.
* Edit: That doesn't mean you shouldn't! :-) However, you might get more readership - if that's what you're interested in - by writing pretty much anywhere, and just sharing it with the right communities.
Took a look at your book's content table and it definitely resonates with my current position, transitioning from being hands on developer to leading a small, growing team of developers.