It's a weird interview process. Shopify tells you that it will be an unconventional interview, and it's nice to have some variation, but I can't really say I'm convinced that it works.
The experience is like many others note: it starts with a phone call--a quick chat; just shooting the breeze and no hard or standard questions. Then, after a week or so, comes an in-person interview. It begins with a quick tour of the place and they'll ask you to take a drink from the fridge, and the interviewer will take whatever you choose. (I picked water because that's what I normally take, so I probably checked off the 'boring' box too quickly!)
This interview emphasizes *you* and Shopify's *feel* of you. It's just a regular(ish) conversation and they tell you it'll be that way. There are no questions about skills or experience, just questions about your life, background, and story. ('Story' is the key word.) I don't think that the approach really makes a fair evaluation of one's skills for the job (it was a writing job and this is the first time that I wasn't asked to do a writing exercise) but it shows prospective employees that the workplace goes against the norm.
I found that I kept catching myself trying to work my experience into the conversation, and I encourage you to avoid bringing up your past work unless they ask for it. The interviewer made a few references that indicated that she at least looked at my resume, anyways. Just talk and embellish. If anything, I recommend having a drink beforehand to loosen up.
Also: they like it very casual, and I worry that I overdressed by wearing professional attire. Wear jeans. Everyone in the office wears jeans and a hoodie. Honestly, you're probably safe so long as you don't have blood or vomit all over yourself!
It's a weird experience, but I'd consider applying again if something comes up.