Consumer shopping app
A native app, built end to end by one person
A consumer shopping product needed a native iOS app, a web platform behind it, and real money moving through both. Tillr Systems designed and built the whole thing, including live payment processing and an earnings ledger whose correctness is enforced by 115 automated tests at the database level rather than trusted to application code.
115
automated tests guarding the money paths
iOS + web
designed, built, and shipped by one person
0
manual steps between a sale and a recorded commission
The problem
Money is the part you cannot get almost right. Commissions had to be attributed, tracked, corrected and paid without a cent going missing or being counted twice, across a mobile app and a web platform that share one set of records. Doing that solo means the safeguards have to be automated, because there is no second pair of eyes.
What we built
- Native iOS app plus the web platform behind it, sharing one data model
- Live payment processing with verified webhook handling for every event that moves money
- An earnings ledger with database-level constraints, so a balance cannot drift from the transactions that produced it
- 115 automated database tests covering the money paths, run before any change ships
- Error monitoring wired into production from day one
Got a version of this problem?
Thirty minutes with us, and you'll know what we'd build and what it would take.