Retail makes a comeback through a mobile experience


Presto-Q is an in-store mobile shopping experience aimed at rescuing supermarkets and brick-and-mortar retail stores from websites such as Amazon and I was brought on as the founding team as the sole designer. Together we came up with the concept, business model, marketing strategy, branding, and most importantly, the user experience.

people shopping

Survey says...

After we came together as a team with our initial assumptions on how we wanted to product to flow, we decided to send out a survey to 150 people with basic shopping habit questions to not only influence the product experience, but also the business strategy.



of people said they go to the grocery store at least twice a month.



Said that they use some sort of shopping list.



Would be willing to pay to by-pass the checkout line 

Get it right

Once we got the results back we needed to make sure the experience was as frictionless as possible. The physical shopping experience usually has three main phases; Planning, grabbing your items, and then checkout.

I put together some basic flows with the team in order to get aligned on how we wanted the experience to flow.


First iteration of shopping flow

Once the main flows were fleshed out, I added more fidelity to the mocks so that we could start testing and get feedback from some research participants.

PrestoQ Working Flow_v5.1_small

Final Flows

A simple onboard flow to educate the customer on our value props and how easy to use our application actually is. We allow Facebook signup for an even easier sign-up experience.


The research survey we conducted determined that a majority of folks still create some sort of shopping list before they go to the store. We wanted to take advantage of that in our app. Not only for making our users lives easier, but also giving us a chance to be able to monetize off of recommended items and manufacturer coupons.


The actual shopping experience needed to be the most seamless. Simply grab   item, scan, and boom. That’s it. The system recognizes which item you scanned, checks it off your list, and adds it to your shopping cart ( have to add it to your physical shopping cart yourself).


Once you’ve collected and scanned all of your items the user is asked to find the Gatekeeper at the exit. There the Gatekeeper will scan a QR code that the user is presented with. The Gatekeeper will quickly verify your transaction with the items in your bag, and let you go on your way.

people shopping2

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Currently in

San Francisco

Copyright · Stephen Calvillo Design 2018