Senior Software Engineer II

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 a culture guided by inclusion, talented peers, comprehensive benefits and career development opportunities. Come make an impact on the communities we serve as you help us advance health optimization on a global scale. Join us to start Caring. Connecting. Growing together.
Primary Responsibilities:

• Build advanced UI components and conversational interfaces using React, Next.js, TypeScript/JavaScript, HTML, and CSS
• Implement complex Generative UI patterns and integrate LLM-driven conversational experiences for enterprise-scale applications
• Use modern tooling (yarn, npm, Vite, Storybook) for efficient component development and maintainability
• Ensure responsive, accessible, and high-performance front-end design optimised for real-time AI interactions and streaming responses
• Apply Jest and Cypress for unit, integration, and end-to-end testing with strong focus on automation and coverage
• Optimise rendering and state management for high-frequency AI-driven interactions and large-scale data flows
• Maintain secure state management and prompt history handling aligned with enterprise security standards
• Collaborate with back-end teams and architects for seamless integration and performance tuning
• Conduct advanced performance profiling, tuning, and participate in architecture reviews
• Stay updated on emerging AI-driven UI trends and contribute to adoption of best practices and new technologies
• Comply with the terms and conditions of the employment contract, company policies and procedures, and any and all directives (such as, but not limited to, transfer and/or re-assignment to different work locations, change in teams and/or work shifts, policies in regards to flexibility of work benefits and/or work environment, alternative work arrangements, and other decisions that may arise due to the changing business environment). The Company may adopt, vary or rescind these policies and directives in its absolute discretion and without any limitation (implied or otherwise) on its ability to do so

Required Qualifications:

• Bachelor's or Master's in Computer Science, Engineering, or related field
• 10+ years of experience in front-end development with deep expertise in modern frameworks and enterprise-scale applications
• Solid experience with Jest, Cypress, and other testing frameworks for robust quality assurance
• Advanced knowledge of modern build tools, workflows, and CI/CD practices
• Deep understanding of responsive, accessible design principles and performance optimisation for real-time systems
• Expert proficiency in React, Next.js, TypeScript/JavaScript, HTML, and CSS
• Proven ability to integrate AI/ML APIs and implement conversational UI patterns
• Proven solid debugging, problem-solving, and optimisation skills for complex front-end architectures
• Proven ability to collaborate effectively with cross-functional teams and influence technical decisions
• Proven excellent communication and documentation skills with a focus on clarity and precision

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.
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