Lead Engineer - Mobile Platform

Optum; United States; Hybrid; USD 112,700 - 193,200; Full time

Job summary

Optum is seeking a Senior Mobile Platform Architect to lead architecture across native iOS/Android and React Native, integrating AI/ML capabilities into scalable, secure mobile experiences.

The role requires strategic vision, hands-on engineering leadership, and mentorship to teams, with a focus on performance, security, and innovative AI deployment in mobile apps. Remote work is available within the U.S., with in-office four days weekly in specified locations.

Qualifications

• 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.
• Proficiency with iOS: Xcode, SwiftUI, UIKit, Combine.
• On-device AI/ML: Core ML, TensorFlow Lite, PyTorch Mobile, ONNX Runtime Mobile.
• Training/Serving: PyTorch, TensorFlow, Hugging Face Transformers.
• Optimization: Quantization, pruning, distillation, TensorRT.
• Cloud/Backend: AWS SageMaker, GCP Vertex AI, Firebase, Azure AI, GraphQL, REST APIs.
• Testing: iOS XCTest, Android Espresso, E2E with Appium.
• Monitoring: Firebase Crashlytics, Sentry, Datadog, New Relic, Mixpanel.
• Security/Privacy: OAuth 2.0, JWT, Keychain/Keystore, secure storage, differential privacy.

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.
• React Native Expertise: Architect hybrid apps combining React Native with native modules.
• Performance: Leverage Fabric, TurboModules, and Hermes for performance.
• CI/CD: 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.
• Security: Enforce enterprise security standards and optimize AI features for latency and memory usage.
• Collaboration: Work with data scientists, backend engineers, and designers to deliver AI-driven experiences.
• Leadership: Provide mentorship on AI/ML and mobile platform engineering.
• Innovation: Experiment with generative AI, personalization engines, multimodal models, and deployment in mobile apps.
• Responsible AI: Design AI solutions with responsible use and enterprise-grade governance.
• Adoption: Leverage enterprise-approved AI tools to streamline workflows and drive improvements.
• Strategy: Monitor trends to inform solution design and innovation.

Skills

Mobile platform architecture

AI/ML integration

React Native

Cross-platform frameworks

Education

Bachelor’s or Master’s in Computer Science/Engineering

Tools

Xcode

SwiftUI

UIKit

Combine

Core ML

TensorFlow Lite

PyTorch Mobile

ONNX Runtime Mobile

PyTorch

TensorFlow

Hugging Face Transformers

TensorRT

AWS SageMaker

GCP Vertex AI

Firebase

Azure AI

GraphQL

REST APIs

XCTest

Espresso

Appium

Firebase Crashlytics

Sentry

Datadog

New Relic

Mixpanel

OAuth 2.0

JWT

Keychain/Keystore

Job description

Optum is a global organization that delivers care, aided by technology to help millions of people live healthier lives. The work you do with our team will directly improve health outcomes by connecting people with the care, pharmacy benefits, data and resources they need to feel their best. Here, you will find talented peers, comprehensive benefits and career development opportunities. Come make an impact on the communities we serve as you help us advance health equity on a global scale. Join us to start Caring. Connecting. Growing together.

Development, and evolution of our next-generation mobile platform with integrated AI capabilities. The ideal candidate will have deep expertise in cross-platform frameworks (React Native), and AI/ML integration. This role requires strategic architectural vision, solid hands-on engineering skills, and the ability to guide teams in building scalable, performant, and secure mobile experiences powered by AI.

You’ll enjoy the flexibility to work remotely * from anywhere within the U.S. as you take on some tough challenges.

For all hires in the Minneapolis or Washington, D.C. area, you will be required to work in the office a minimum of four days per week.

Primary 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
• 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

You’ll be rewarded and recognized for your performance in an environment that will challenge you and give you clear direction on what it takes to succeed in your role as well as provide development for other roles you may be interested in.

Qualifications -

Required Qualifications:

• 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 Development Tools & Frameworks experience to include:
• iOS: Xcode, SwiftUI, UIKit, Combine
• 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
• Testing & QA experience with:
• 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

Preferred Qualifications:

• 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
• 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.

Pay is based on several factors including but not limited to local labor markets, education, work experience, certifications, etc. In addition to your salary, we offer benefits such as, a comprehensive benefits package, incentive and recognition programs, equity stock purchase and 401k contribution (all benefits are subject to eligibility requirements). No matter where or when you begin a career with us, you’ll find a far-reaching choice of benefits and incentives. The salary for this role will range from $112,700 to $193,200 annually based on full-time employment. We comply with all minimum wage laws as applicable.

Application Deadline: This will be posted for a minimum of 2 business days or until a sufficient candidate pool has been collected. Job posting may come down early due to volume of applicants.

At UnitedHealth Group, our mission is to help people live healthier lives and make the health system work better for everyone. We believe everyone–of every race, gender, sexuality, age, location and income–deserves the opportunity to live their healthiest life. Today, however, there are still far too many barriers to good health which are disproportionately experienced by people of color, historically marginalized groups and those with lower incomes. We are committed to mitigating our impact on the environment and enabling and delivering equitable care that addresses health disparities and improves health outcomes — an enterprise priority reflected in our mission.

UnitedHealth Group is an Equal Employment Opportunity employer under applicable law and qualified applicants will receive consideration for employment without regard to race, national origin, religion, age, color, sex, sexual orientation, gender identity, disability, or protected veteran status, or any other characteristic protected by local, state, or federal laws, rules, or regulations.

UnitedHealth Group is a drug - free workplace. Candidates are required to pass a drug test before beginning employment.