I don't know the job posting that the author had read, or what guided their expectations, but here is a current Shopify Senior Frontend Engineer job posting:

https://webcache.googleusercontent.com/search?q=cache:wxk6Q4...

This job posting sounds like it lines up with author's experience at the company, and knowing Shopify is a Rails-heavy company, I would safely assume most Shopify postings look similar to this. I don't think author was bait-and-switched, author just didn't get what they _wanted_.

Note: providing a google cache link since I don't know when the posting will expire