Top Front End Developer Jobs in Denver & Boulder, CO

Lead frontend technical strategy for Affirm’s checkout decision orchestration systems. Design and architect scalable web applications, guide major technical initiatives, improve reliability and operational processes, establish engineering quality standards, collaborate with product, design, and analytics, and mentor engineers. The role focuses on building fast, clear, and reliable checkout experiences using modern declarative UI frameworks.

Build and maintain Vue.js interfaces for Openly’s insurance platform, supporting agents and internal users. Responsibilities include implementing UX initiatives, developing administration interfaces, integrating REST and GraphQL APIs, simplifying technical designs, contributing to architectural decisions, testing applications, identifying technical risks, and collaborating across product and engineering teams.

Build and maintain customer-facing web applications and digital journeys for Jabra Enhance. Develop accessible, high-performing features using React.js, JavaScript, CSS, Relay, and GraphQL; collaborate with design and engineering teams; create reusable components; optimize performance and reliability; participate in architecture reviews, refactoring, and Agile ceremonies.

Build and maintain fast, intuitive frontend applications for blockchain and Web3 products. Collaborate with product, design, and engineering teams; develop reusable components and frontend architecture; integrate wallets and smart-contract interactions; improve performance, reliability, and accessibility; participate in technical planning and code reviews; mentor other developers and establish frontend best practices.

Lead frontend-focused full-stack development for a neurotechnology platform controlling brain stimulators, managing patient data, visualizing real-time 3D data, integrating APIs, syncing cloud systems, and improving user experience. The role involves React and React Native frontend work, Python or Node.js backend development, team growth and mentorship, and collaboration on secure, scalable healthcare applications.

Develop and maintain front-end geospatial web applications using Vanilla JavaScript and the ArcGIS JavaScript API 4.x. Integrate spatial data and services, optimize map rendering and application performance, support SQL Server ETL workflows, and contribute to code reviews, architecture, and technical documentation.

Build and lead the frontend architecture for Tailscale’s next-generation web console. Responsibilities include developing shared frontend infrastructure, identity and authentication systems, cross-origin session management, testing strategies, developer tooling, deployment workflows, and unified product experiences. The role partners across design, growth, product, infrastructure, and engineering while providing technical leadership, mentoring, and on-call incident support.

Senior or Staff Frontend Engineer responsible for developing scalable, high-performance web applications, shaping frontend architecture, mentoring engineers, and leading cross-functional feature delivery. The role requires modern JavaScript and TypeScript expertise, strong UI system design, API integration, debugging, and technical documentation skills. The engineer will also promote AI-assisted and agentic development practices, collaborate with product and backend teams, and build intuitive healthcare payment interfaces.

Senior UI Engineer responsible for building accessible, high-performance React applications and scalable front-end architecture for a pharmacy management platform. The role includes developing design-system components, defining API contracts, leading testing and code reviews, improving performance and accessibility, mentoring engineers, partnering with product and design, and using AI development tools responsibly. Candidates need strong React, TypeScript, CSS, REST API, Node.js, and PostgreSQL experience, plus end-to-end project ownership and cross-functional leadership.

Build and maintain customer-facing and internal web applications using React and TypeScript across Rails-embedded and standalone environments. Own shared component libraries, implement Figma designs, improve frontend performance, integrate REST APIs, expand automated testing, and investigate production issues. Collaborate closely with design, product, and backend engineering while documenting maintainable patterns and applying coding agents effectively.

Designs, develops, tests, deploys, operates, and maintains scalable full-stack software products. Builds React-based enterprise applications, writes production-ready code, performs code reviews, improves reliability and performance, integrates APIs, and follows security, compliance, accessibility, and DevOps practices. Collaborates across teams using agile methods, analyzes failures, prioritizes work, and contributes to technology transformation and continuous improvement.

Develop and maintain front-end web applications and cloud-native microservices for mission management systems. Build user interfaces with JavaScript and TypeScript, write automated tests, deploy through DevSecOps pipelines, troubleshoot defects, and collaborate within an Agile Kanban team. The role is fully onsite in a SCIF and requires TS/SCI clearance with CI polygraph eligibility or willingness to complete the polygraph.

Lead the strategic direction of frontend engineering, architecture, tooling, and standards. Build accessible, high-performing React or Angular applications, component libraries, design systems, deployment pipelines, and testing strategies. Drive modernization, performance, accessibility, and developer-experience initiatives while collaborating with product and design teams. Mentor engineers, influence cross-team technical decisions, and contribute across the full stack when needed. The role is remote, requires U.S. citizenship and the ability to obtain Public Trust 6C, and involves up to 10% travel.

Own end-to-end development of customer-facing web platform features, emphasizing React and TypeScript frontend development while contributing to Python backend services. Translate product concepts and designs into reusable, intuitive UI components, partner with Product and Design, engage directly with users, and use AI-powered tools to accelerate development while maintaining code quality and performance.

Develop and maintain performant frontend web applications for real-time, mission-critical data. Responsibilities include UI architecture, API integration, responsive design, automated testing, performance optimization, security remediation, code reviews, Agile collaboration, documentation, and frontend reliability improvements.

Design, develop, and maintain web and mobile applications for Alpaca’s trading API customers. Build responsive, performant, accessible user interfaces and deliver high-visibility features from design through deployment. Collaborate with cross-functional teams, contribute to frontend and backend systems, influence technical strategy, and mentor peers. Work includes trading dashboards, product features, and end-to-end user experiences across frontend and backend platforms.

Build responsive, high-performance React and Next.js interfaces for cloud workspace creation, resource management, billing, monitoring, and developer tools. Integrate applications with backend APIs and real-time services, improve performance and accessibility, and develop reusable components. Collaborate with backend engineers and product teams while contributing to feature ownership and product decisions.

Build and maintain responsive, accessible web interfaces using React, HTML, CSS, and JavaScript/TypeScript. Integrate applications with REST APIs and back-end services, implement WebSocket features, optimize Core Web Vitals, and develop reusable design-system components. The role also involves Node.js tooling, cross-browser compatibility, code reviews, QA collaboration, and front-end testing.

Build and ship healthcare software across the frontend, API, and database using React, TypeScript, Next.js, tRPC, Prisma, and related technologies. Own features end to end, prototype with AI tools, test with patients and care teams, and improve performance, accessibility, reliability, and scalability. Collaborate closely with company leadership in a fast-paced startup environment while developing trustworthy automation for healthcare delivery.

Develop and maintain responsive frontend interfaces, dashboards, reports, and enterprise web applications. Translate requirements into functional user interfaces, build UI and automated tests, troubleshoot and optimize performance, implement REST API integrations and routing, and collaborate with backend developers and testers. The role requires React, JavaScript, Redux, Node.js, and related frontend technologies, with preferred experience in dashboards, reporting, testing, AWS, and government applications.

Build and maintain responsive, accessible front-end interfaces using React, React Native, HTML, CSS, and Shopify. Apply UX/UI principles, collaborate with designers and multidisciplinary teams, provide clear technical feedback, and independently deliver high-quality work on complex technology or AI-related projects. Contractors complete output-based tasks and must meet weekly minimum submission requirements, with an expected start within 24–48 hours of onboarding.

Design and build user-facing features for a live video chat and multiplayer gaming platform. Collaborate with designers and product managers, lead technical quality and scalability efforts, rapidly experiment, and solve customer problems through deep user understanding. The role focuses on front-end architecture using TypeScript and React, with Node.js proficiency and strong CSS fundamentals.

Lead frontend feature releases and own user experience, performance, testing, and production health for a React and TypeScript dental practice management platform. Collaborate with backend engineers using Java Spring Boot, develop AI-powered interfaces, integrate AI tools such as Claude, participate in code reviews, improve team efficiency, and estimate development work for timely delivery.

Own the frontend technical roadmap and architecture for Archy’s dental practice management SaaS. Lead major feature releases, optimize React and TypeScript performance, integrate AI-powered interfaces, and oversee frontend-backend integration with Java Spring Boot. Establish testing, stability, monitoring, and production release practices while leading code reviews, planning development efforts, and improving team efficiency.

Develop and maintain responsive Angular web applications using Angular 19+, Signals, Reactive Forms, and modular component architecture. Build complex forms, integrate REST APIs with RxJS, optimize change detection and performance, and create unit tests with Vitest or Jest. Collaborate with design, backend, and product teams, troubleshoot cross-browser issues, participate in code reviews, and follow modern front-end development practices.