Sr Software Engineer(UI)

UnitedHealth Group•Schaumburg, IL

21h•$91,700 - $163,700•Remote

About The Position

A UI Software Engineer at Optum spends each day designing, building, and refining user‑facing features that make applications intuitive, responsive, and visually consistent. Their work typically involves translating product requirements and design mockups into clean, maintainable code using front‑end technologies, collaborating closely with designers, product managers, and backend engineers at Optum to ensure seamless interactions and data flow. Day-to-day tasks include implementing new UI components, fixing visual or usability bugs, optimizing performance and accessibility, and reviewing code to maintain quality standards. They work closely with Quality Engineers to help update or generate automated tests; they test their work across browsers and devices, incorporate user feedback, and continuously improve the interface to deliver a polished and engaging user experience. You’ll be rewarded and recognized for your performance in an environment that will challenge you and give you clear directions on what it takes to succeed in your role as well as provide development for other roles you may be interested in.

Requirements

Undergraduate degree or equivalent experience.
5+ years proven front-end experience building scalable React applications and component libraries.
3+ years of hands-on experience with TypeScript 5 (typing props, generics, utility types, type guards) and modern React patterns (hooks, memoization, context when appropriate).
2+ years of experience with Redux Toolkit and React Redux; comfortable designing slices/selectors and handling async flows.
2+ years of experience with React Router (v7) for routing, guarded flows, and navigation patterns.
2+ years of experience with SCSS for styling (variables, mixins, responsive layouts), with a focus on maintainable, mobile-first design.
2+ years of experience maintaining a living design system and documenting components in Storybook 8.
2+ years of experience with Jest 29 and Testing Library for unit/integration tests; Playwright for E2E; familiarity with mock strategies and test isolation.

Nice To Haves

Experience with analytics instrumentation, internationalization, and performance profiling.
Familiarity with Nx monorepos, modular libraries, and performance optimization within large codebases.
Strong understanding of web accessibility (WCAG AA), semantic HTML, and keyboard navigation.
Comfort with build tools, CI/CD, and version control (Git), plus Agile collaboration.
Excellent communication skills, attention to detail, and a collaborative mindset.

Responsibilities

Build accessible, reusable UI components in React 19 with TypeScript 5, following industry best practices.
Translate dynamic mockups into production-ready components and pages, ensuring WCAG AA compliance, keyboard accessibility, and semantic HTML.
Implement application flows using React Router 7 and state management with Redux Toolkit and React Redux.
Maintain and evolve our SCSS-based design system; document and showcase components in Storybook 8.
Optimize rendering, bundle size, and runtime performance using memoization, hooks, and Nx workspace tooling.
Write and maintain unit and integration tests using Jest 29 and Testing Library; contribute to E2E coverage with Playwright.
Collaborate with shared libraries, strict typing, and CI pipelines; follow code review and git workflows.
Contribute to internationalization and runtime translation patterns and ensure robust error handling and analytics instrumentation where needed.
Participate in Agile ceremonies; partner with design and product to plan features, refine requirements, and evaluate technical trade-offs.
Write high-quality, accessible UI shipped with strong test coverage and documented in Storybook.
Create reusable components and hooks that reduce duplication and accelerate feature delivery.
Wrote maintainable code that fits industry standards: typed, readable, and well-tested.
Contribute measurable improvements in performance, reliability, and developer experience across our codebase.
Design, develop, and deploy AI-powered solutions to address complex business challenges with emphasis on responsible use of AI