A faster convenience store experience

Project Background

In collaboration with a UX team, I designed a mobile app for an emergent retail store.


Usability testing
UI design


Google Suites


5 weeks


Twindow is a convenience store offering essential goods like basic groceries, over-the-counter medications, household and personal care items, and prepared meals.

The store aims to provide unmatched customer convenience with a fully digital and contactless shopping experience.

How It Works

Step 1:

Build your order on the Twindow app

Step 2:

Scan your QR code at the drive-thru

Step 3:

The automated picker gathers your items

Step 4:

Receive your order from the attendant

The Project Challenge

Design a companion ordering app for Twindow.



The good
  • Open late or 24/7
  • Same-day delivery
the not-so-good
  • Service fees
  • Wait time can vary
The good
  • Huge inventory
  • Competitive prices
the not-so-good
  • Pickup order minimums
  • Scheduled pickups only
The good
  • Contact-free checkout
  • Robust integrated app
the not-so-good
  • No curbside pickup
  • No delivery
The good
  • Regularly updated store stock info
  • Deals and coupons
the not-so-good
  • No curbside pickup
  • No same-day delivery

Twindow's Advantages

No minimum orders
No long wait times
No service fees
No store entry


"Sometimes shopping online can take just as long as going to the store."
- Katya, user
Our users...
  1. Work outside of the house
  2. Have children below driving age
  3. Live in suburban areas
  4. Heavily rely on a personal vehicle
  5. Have tried other online shopping services


They plan ahead and Share Errands with spouses
They're short on time between work and family Life
They're unsatisfied with other Delivery/Pickup Options
They visit convenience stores for Urgent purchases


Our User

Using our interview insights, we crafted a research-based persona to exemplify potential Twindow users.

Meet Rachel


  • Has two young children and another on the way
  • Commutes an exhausting 3 hours to the city every day for work
  • Rarely has time for activities outside of work, regular household duties, and planned family responsibilities
  • Shares shopping lists and errand duties with her husband, Matthew


  • Maintaining a smooth work-life balance
  • Keeping track of needed household items
  • Shopping more efficiently


  • Extra store visits
  • Bringing the kids on errand runs
  • Miscommunications with Matthew

Her Predicament

Now knowing Rachel's situation, we formed a problem statement to identify what problem Twindow could solve for her.

Car-reliant working parents need an easy way to get last minute items, because They struggle to fit extra errands Into their busy schedules.

Her Experience

We wanted to put ourselves in Rachel's shoes during an extra store run. We used a journey map to visualize her pain points, emotions, and opportunities for Twindow.



When it comes to robust group discussions and decision making, it's easy to get lost in the woods. We decided on a set of design principles to keep us on track during ideation.


Give users the ability to personalize their in-app experience.


Prioritize simplicity for quick learning and easy decision making.


Provide information users need to feel comfortable using the app.

Starting Concepts

We created six initial concepts and tested them with a group of users similar to our persona, Rachel.

 On Target

Interactive List

Build a shopping list and see matching available products.

Voice Command

Order hands-free using voice commands.

Map Search

Search for items and see which Twindow store carries it.

Shopping Assistant

Get purchasing reminders based off your search and order history.

Missed the Mark

Car app

Create orders through your car console.

Category vs event

Browse products according to usage or category.

Back To The Drawing Board

During team retrospection, it was clear more concepting was needed. Users liked certain aspects of the individual concepts, but thought they were too weak to use as a standalone solution.

We reideated on the well-received ideas and strengthened them into more robust solutions.

Map Concept

See products currently available at Twindow stores within a map area


A map-centric home page initially confused users. However, they showed an interest in map functionality within a greater design.

Chatbot Concept

Order items through a chatbot using text and voice commands.


Users liked the idea of chatbots, but felt the back and forth exchanges were too tedious and failed to meet their short notice shopping needs.

List Concept

Create shared shopping lists that multiple users can edit and pick up.


Ultimately, the shared list performed best with users. They felt it could improve collaboration with their partners and speed up extra store runs.

Building an MVP

Converging concepts

Based off the user feedback, we decided to build out the shared list concept and merge it with aspects from the map concept.

The chatbot, while fun in theory, didn't meet our users' needs and was dropped from consideration.

Twindow Prototype
"We [my husband and i] share grocery lists on the notes app, so this could help with that."
- Julia, user


home Screen

Search for items, view relevant products, or quickly access recent orders.

Product Screen

See product information and similar items. Add to an order, or choose "Get Now" for immediate purchase.

Order Screen

View your order, edit items, add members, and see charge details.

Members Screen

See current order members, or add new ones from your contacts.

pickup Screen

Select an order member and Twindow store for pickup.

Reservation Screen

Review your order details and access the QR code to scan at the window.

Usability testing

For testing, we had users add baby formula to an order, assign pickup details, and proceed to checkout. What did our users think?

Future suggestions

Entering city Markets

Our urban usability testers used convenience stores at higher frequencies than suburban testers. A walk-up store model might prove successful in high-pedestrian urban areas.

Phone-less Pickup

Leaning out the window to scan your phone can be difficult. An easier alternative could be windshield badges scanned by overhead sensors at the Twindow drive-thru.

You made it!

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