[Remote] Lead Engineer - Mobile Platform

Note: The job is a remote job and is open to candidates in USA. Optum delivers technology-enabled care and health services that help people live healthier lives. The Lead Engineer will define and evolve a next-generation mobile platform with integrated AI capabilities, leading architecture, hands-on development, performance, security, collaboration, mentorship, and responsible AI innovation.

Responsibilities

• Architecture & Platform Leadership: Define and drive the technical roadmap across native (iOS, Android) and cross-platform (React Native) solutions
• AI Integration: Implement and optimize AI/ML models for mobile apps using Core ML, TensorFlow Lite, PyTorch Mobile, and ONNX Runtime Mobile
• Hands-on Development: Deliver clean, scalable, and maintainable code in Swift, Kotlin/Java, TypeScript/JavaScript (React Native), and Python for ML workflows
• React Native Expertise:
• 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
• Framework & Tooling: Establish SDKs, libraries, and shared components to unify native and RN ecosystems
• Performance & Security: Optimize AI features for latency, memory, battery usage, and enforce enterprise security standards
• Collaboration: Partner with data scientists, backend engineers, and designers to deliver seamless AI-driven user experiences
• Mentorship & Leadership: Provide technical mentorship on both AI/ML and mobile platform engineering
• Innovation: 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

Skills

• • 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
• •All employees working remotely will be required to adhere to UnitedHealth Group's Telecommuter Policy
• • 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)

Benefits

• Flexibility to work remotely from anywhere within the U.S.
• Comprehensive benefits package
• Incentive and recognition programs
• Equity stock purchase
• 401k contribution
• Career development opportunities

Company Overview

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