Lead Engineer - Mobile Platform (AI & Cross-Platform) - Remote

Optum is a global organization that delivers care aided by technology to help millions of people live healthier lives. The Lead Engineer will be responsible for the development and evolution of a next-generation mobile platform with integrated AI capabilities, guiding teams in building scalable and secure mobile experiences powered by AI.

Responsibilities:

• Define and drive the technical roadmap across native (iOS, Android) and cross-platform (React Native) solutions
• Implement and optimize AI/ML models for mobile apps using Core ML, TensorFlow Lite, PyTorch Mobile, and ONNX Runtime Mobile
• Deliver clean, scalable, and maintainable code in Swift, Kotlin/Java, TypeScript/JavaScript (React Native), and Python for ML workflows
• Architect hybrid apps combining React Native with native modules
• Leverage Fabric, TurboModules, and Hermes for performance
• Enable OTA updates via CodePush, Expo Updates, and ensure smooth CI/CD delivery
• Establish SDKs, libraries, and shared components to unify native and RN ecosystems
• Optimize AI features for latency, memory, battery usage, and enforce enterprise security standards
• Partner with data scientists, backend engineers, and designers to deliver seamless AI-driven user experiences
• Provide technical mentorship on both AI/ML and mobile platform engineering
• Experiment with generative AI, personalization engines, multimodal models, and their deployment in mobile apps
• Design, develop, and deploy AI-powered solutions to address complex business challenges with emphasis on responsible use of AI
• Leverage enterprise-approved AI tools to streamline workflows, automate tasks, and drive continuous improvement
• Evaluate emerging trends to inform solution design and strategic innovation

Requirements:

• Bachelor's or Master's in Computer Science, Engineering, or related field
• 10+ years of software engineering experience, with at least 5 years in mobile platform architecture
• Experience with programming languages: Mobile: React Native, Kotlin/Java, Cross-platform: JavaScript/TypeScript (React Native), AI/ML: Python (PyTorch, TensorFlow, Hugging Face, ONNX)
• Mobile Development Tools & Frameworks experience to include: iOS: Xcode, SwiftUI, UIKit, Combine, Android: Android Studio, Jetpack Compose, Gradle, React Native: RN CLI, Expo, Redux/Context API, React Navigation, Metro bundler
• AI/ML Tools & Frameworks experience to include: On-device: Core ML, TensorFlow Lite, PyTorch Mobile, ONNX Runtime Mobile, Training/Serving: PyTorch, TensorFlow, Hugging Face Transformers, Optimization: Quantization, pruning, distillation, TensorRT
• Cloud & Backend Platforms experience with AWS SageMaker, GCP Vertex AI, Firebase, Azure AI, GraphQL, REST APIs
• CI/CD & DevOps: GitHub Actions, Fastlane, Bitrise, Jenkins, AppCenter, Docker, Kubernetes
• Testing & QA experience with: React Native: Jest, Detox, iOS: XCTest, Android: Espresso, E2E: Appium
• Monitoring & Analytics experience with Firebase Crashlytics, Sentry, Datadog, New Relic, Mixpanel
• Security & Privacy experience with OAuth 2.0, JWT, Keychain/Keystore, secure storage, differential privacy
• Experience leading large-scale React Native + native hybrid projects
• Knowledge of generative AI (LLMs, diffusion models, multimodal) applied in mobile contexts
• Contributions to open-source React Native or AI libraries
• Expertise in design systems for consistent cross-platform UI
• Familiarity with global-scale delivery (internationalization, accessibility, offline-first apps)
• All employees working remotely will be required to adhere to UnitedHealth Group's Telecommuter Policy