Korner Rewards
A loyalty app for a convenience and fuel retailer, now released on iOS and Android. It started as a prototype I built on my own. I then built the first version of the mobile app and its backend, integrated with the retailer’s existing loyalty provider.
- Role
- Initiated, prototyped, and built the initial app
- Stack
- Kotlin Multiplatform, Android, iOS (Swift), Node.js, TypeScript, PostgreSQL
- Status
- Publicly released · iOS & Android
How it started
Korner had discussed building a loyalty app, but the idea hadn’t moved forward.
I built an early prototype, put together UI concepts and user journeys, and showed management a working demo. They approved it for development.
From there, I worked with Product and Operations to define the first release, and with Electrum, the existing loyalty provider, to understand its APIs and production requirements.
The app in action
A tour of the released app
Members scan a card at the counter to earn points and redeem them for coupons, find offers, and locate the nearest stores with current fuel prices.
Home and membership
Member card for earning and redeeming in store. Barcode and member ID redacted.
Rewards and coupons
Points balance and the coupons it can be redeemed for.
Store discovery
Every location, with distance and current fuel prices.
Engineering
Building around existing retail systems
The app had to fit systems the retailer already ran: loyalty accounts managed through Electrum, promotions configured through CStore, and redemption at the store counter.
I built the initial Kotlin Multiplatform/Android app and the backend integrations for membership, rewards, offers, age verification, and store discovery. The backend used Node.js, TypeScript, and PostgreSQL.
Electrum required a privacy policy and age-gated verification before granting production API access. I worked through those requirements with their representatives and built the app’s age-verification flow.
Outcomes
- Released publicly on the App Store and Google Play.
- I built the prototype that got it approved, then the initial app and backend integrations.
- The released app includes the wider team’s work. Another engineer helped test the iOS app and led the Donations feature.