Principal Engineer, Unity Rewards

Unity Technologies•San Francisco, CA

10d

About The Position

We are looking for a Principal Mobile App Developer to architect and lead the development of a standalone B2C mobile application. This app will serve as a premier destination for players to discover new games, track their playtime and milestones, and earn real-world rewards. You will be building the highly gamified "storefront" that sits on top of Unity’s massive backend ML and data infrastructure. If you have built massive consumer apps featuring real-time ledgers, gamified progression systems, and flawless, 60fps UIs, this is a rare opportunity to build a product from the ground up with the backing of the biggest player in mobile gaming.

Requirements

Deep Mobile Expertise: 8+ years of experience building native (Swift/Kotlin) or high-performance cross-platform (React Native/Flutter) consumer mobile applications at scale.
Consumer Gamification Experience: Proven track record building apps with high DAU/MAU that rely on gamification, loyalty programs, or fintech/wallet features.
Architectural Mastery: Deep understanding of modern mobile architecture patterns (MVVM, Clean Architecture, VIPER), memory management, and performance profiling.
Event-Driven Systems: Experience handling complex asynchronous data streams, real-time websocket connections, and local persistence for offline-first capabilities.
UI/UX Obsession: You care deeply about micro-interactions, animations, and how an app feels in the user's hands.

Nice To Haves

Previous experience at a pure-play consumer rewards company (e.g., Mistplay, Fetch, Ibotta, JustPlay) or a consumer fintech app with heavy gamification.
Familiarity with mobile attribution platforms (AppsFlyer, Adjust, Singular) and how playtime/event milestones are tracked under the hood.
A passion for mobile gaming and an understanding of what drives player retention.

Responsibilities

Lead the Architecture: Design and architect the mobile client (iOS/Android) for a greenfield consumer rewards application. You will make the foundational decisions on the tech stack, state management, and app architecture.
Build the Consumer Experience: Develop highly engaging, gamified UI/UX components—including daily streak mechanics, dynamic offer walls, progress trackers, and real-time wallet balances.
Integrate at Scale: Connect the consumer app directly into Unity’s backend event-pipelines and ML attribution models (optimizing for expected user value, e.g., E[V] and retention probability.
Manage Virtual Economies: Architect robust on-device state management that handles virtual currencies, ledger updates, and offline/online syncing without dropping a single transaction.
Anti-Fraud & Attribution: Work alongside our ML and backend teams to implement secure, tamper-proof event tracking to prevent device farming and exploit loops.
Technical Leadership: Mentor senior mobile engineers, set the standard for code quality, and define the CI/CD and release pipelines for a high-frequency update cycle.