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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # UI Engineer - **Company:** AllSTEM Connections - **Location:** Ontario, CA, United States - **Experience:** Expert - **Contract:** Temporary contract - **Skills:** Adobe Analytics, JavaScript (Programming Language), Microsoft Windows, Web Accessibility, Application Programming Interfaces (APIs), Agile Methodology, Component-Based Software Engineering, Automation of Tests, Big Data, C Sharp (Programming Language), Cascading Style Sheets (CSS), Profiling, Code Review, Continuous Integration, Software Debugging, Programming Tools, Performance Tuning, Scrum Methodology, Software Engineering, Data Streaming, TypeScript, Web Content Accessibility Guidelines, WebSocket, Performance Testing, ReactJS, Caching, Backend, AngularJS, Linux Development, Material UI, Information Technology, Front End Software Development, React Testing Library, JestJS, Restful APIs - **Published:** September 3, 2026 - **Apply:** https://www.dice.com/job-detail/e9c76336-7996-48e1-8b2f-05fea2de1165 ## About the Role Education: Bachelor's degree in Computer Science, Software Engineering, or a related technical field (or equivalent demonstrated professional experience). Experience Baseline: Minimum of 4+ years building production web front-ends. Technical Mastery: oDeep, current expertise in TypeScript and React (hooks, component composition, state management, and rendering behavior). oFluent modern HTML and CSS (responsive layouts, modern theming, CSS modules or CSS-in-JS). oDemonstrated experience building or extending a reusable component library or design system consumed by multiple applications. oStrong debugging and performance analysis skills using browser developer tools (profiling render cost, tracing network behavior, isolating memory growth). Core Competencies: Clear understanding of architecture boundaries (application code vs. UI framework vs. REST API); fluent in CI/CD workflows (small PRs, automated testing, code reviews); comfortable working across Windows and Linux development environments. Preferred Attributes Experience implementing accessibility standards against WCAG 2.1 AA (ARIA patterns, keyboard-only navigation). Familiarity with back-end integration (Node.js/BFF or .NET/C#) to debug across the API boundary; Angular familiarity is a plus. Experience building UIs for real-time or high-frequency data streams (WebSockets/SSE, virtualized tables, time-series charting). Background in developing, testing, and publishing browser extensions (Chrome/Edge). Prior domain experience in industrial control, IoT, operational technology, or complex enterprise SaaS platforms. ## Description We are seeking an experienced, results-driven Senior UI Engineer to join our established Agile Scrum team for a 6-month strategic engagement. In this role, you will contribute directly to our shared UI framework-the component, theming, state, and API-access layer powering our next-generation enterprise user interfaces deployed across edge/on-premises and cloud targets., This is a hands-on, high-impact delivery role where you will work alongside permanent engineering staff to build, harden, and scale reusable design system components and complex feature surfaces. You will solve challenging front-end problems, including high-frequency data rendering, performance profiling, accessibility compliance, and cross-target correctness. If you possess deep expertise in modern React and TypeScript and a passion for crafting robust design systems, we want to hear from you., Framework & Component Development Design Systems: Build, extend, and harden reusable React and TypeScript components within our design system, covering states, theming/tokens, keyboard interaction, and strict accessibility standards. Feature Surfaces: Implement assigned user interfaces and complex workflows against defined UX designs and REST/streaming APIs, managing robust data fetching, caching, and offline/degraded-connectivity states. Cross-Target Correctness: Ensure seamless UI execution across diverse target environments (edge/on-premises and cloud-hosted deployments), supported browsers, and screen sizes. Quality, Testing & Performance Test Automation: Write and maintain comprehensive unit and component tests using Jest/Vitest and React Testing Library, contributing automated end-to-end coverage for all delivered flows. Performance Tuning: Diagnose and resolve front-end performance bottlenecks, including bundle size reduction, render cost profiling, large data-set rendering, and memory retention in long-running sessions. Defect Resolution: Take assigned defects from triage to verified fix, providing thorough root-cause documentation. Collaboration & Handover Agile Delivery: Participate actively in all Agile ceremonies (backlog refinement, estimation, daily standups, sprint reviews, and retrospectives) within a 3-week sprint cycle. Documentation: Leave behind clean component documentation, usage examples, and architectural decision notes to ensure seamless ownership by the permanent team post-engagement. ## Related Videos - [But, you're not Facebook](https://www.wearedevelopers.com/videos/378-but-you-re-not-facebook) - [Developing the Backend with Stefan Lingler, CTO at Shpock](https://www.wearedevelopers.com/videos/100360-developing-the-backend-with-stefan-lingler-cto-at-shpock) - [HTTP headers that make your website go faster](https://www.wearedevelopers.com/videos/1676-http-headers-that-make-your-website-go-faster) - [Meet Your New BFF: Backend to Frontend without the Duct Tape](https://www.wearedevelopers.com/videos/682-meet-your-new-bff-backend-to-frontend-without-the-duct-tape) - [Event based cache invalidation in GraphQL](https://www.wearedevelopers.com/videos/433-event-based-cache-invalidation-in-graphql) - [WeAreDevelopers LIVE – Frontend Inspirations, Web Standards and more](https://www.wearedevelopers.com/videos/1761-wearedevelopers-live-frontend-inspirations-web-standards-and-more) ## Related Articles - [16 Best Free React UI Libraries in 2025](https://www.wearedevelopers.com/magazine/148-16-best-free-react-ui-libraries-in-2025) - [Dev Digest 133 - Back to Front](https://www.wearedevelopers.com/magazine/474-dev-digest-133-back-to-front) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [The Best 7 Frontend Frameworks for Developers in 2025](https://www.wearedevelopers.com/magazine/400-the-best-7-frontend-frameworks-for-developers-in-2025) - [25 Essential Tools for Front End Developers](https://www.wearedevelopers.com/magazine/210-25-essential-tools-for-front-end-developers) - [Dev Digest 113 - Debugging above the cloud](https://www.wearedevelopers.com/magazine/422-dev-digest-113-debugging-above-the-cloud)