Principal Engineer, Unity Rewards

About the role

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.

What you'll be doing

• Lead the Architecture: Design and architect the mobile client (iOS/Android) for a greenfield consumer rewards application. Make 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.

What we're looking for

• 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.

Additional information

• Relocation support is not available for this position
• $227,900.00 - $341,900.00
• This range reflects the anticipated base salary for this position. Beyond base salary, this role may be eligible for equity awards and participation in our company incentive plans (such as annual discretionary bonuses or sales commissions).
• The final offer amount will depend on several factors, including geographic location and the candidate’s relevant experience, professional background, and skill set.
• Benefits: Comprehensive health, life, and disability insurance | Commute subsidy | Employee stock ownership | Competitive retirement/pension plans | Generous vacation and personal days | Support for new parents through leave and family-care programs | Office food snacks | Mental Health and Wellbeing programs and support | Employee Resource Groups | Global Employee Assistance Program | Training and development programs | Volunteering and donation matching program

Life at Unity

Unity [NYSE: U] is the world’s leading game engine, powering play for more than 3 billion consumers each month. The top mobile games in the world, the most played PC indie titles, the most innovative console games, and virtually all of the top XR and Web Games are developed, deployed, and grown in Unity. Unity also enables teams across industries like automotive, manufacturing, and healthcare to design, simulate, and collaborate in 3D — closing the gap between ideas and reality.