# Stephane Lanfranchi — Senior iOS Engineer

> Apps you hold. Systems you don't see. I build Finely end to end, and spent years building the platform behind thousands of GoodBarber apps.

- Canonical: https://lanfranchistephane.dev/

## Apps

- [Finely](https://lanfranchistephane.dev/apps/finely/) — Public beta on TestFlight. Know what your month is really costing you.

## Featured articles

- [One Subscription Flow for Thousands of Apps](https://lanfranchistephane.dev/articles/in-app-purchase-infrastructure/) — GoodBarber · Platform, 6 min read. How GoodBarber apps sell subscriptions: one shared service shows only what Apple can sell, lets the server confirm every purchase, and unlocks the same access on every screen.
- [One Layout Engine for the App's Content Lists](https://lanfranchistephane.dev/articles/layout-engine/) — GoodBarber · Platform, 8 min read. How GoodBarber's list templates got one shared layout: the same code sizes and places a list on the home page and on a full screen, measures each item with the view that draws it, and slots native ads between items.
- [An On-Device Assistant That Never Makes Up a Number](https://lanfranchistephane.dev/articles/on-device-ai-assistant/) — Finely, 7 min read. How Finely answers questions about your money on the iPhone: Apple's on-device model only works out what is being asked, and Finely calculates every amount from your own transactions. Without Apple Intelligence, simple rules take the model's place.

[All 9 articles](https://lanfranchistephane.dev/articles/)

## Path

- **First product — Learning from work in the field.** A route-planning app for independent nurses made every interaction concrete: a missed state or unclear step interrupted real work. (UIKit / workflows / reliable state)
- **GoodBarber — Working at platform scale.** One server-driven system had to serve thousands of customer apps. Changes needed to support configuration, legacy behavior, and gradual migration. (UIKit / Objective-C / configurable UI)
- **Senior scope — Taking responsibility beyond implementation.** My work grew to include architecture, StoreKit, WebKit, privacy, lifecycle, SDK migrations, performance investigations, and mentoring. (Architecture / production diagnosis / guidance)
- **Finely — Owning one product end to end.** I make the product and engineering decisions across financial rules, interaction, persistence, privacy, monetization, on-device intelligence, and release. (Product / domain / UIKit / release)

## Contact

- Email: stephane.portfolio@pm.me
- LinkedIn: https://www.linkedin.com/in/st%C3%A9phane-lanfranchi-742992153/
- GitHub: https://github.com/StephaneLanfranchi