Top Front End Developer Jobs in Boston, MA

Volunteer Principal Front End Developer to build React/React Native web and mobile features, mentor engineers, implement scalable full‑stack solutions, ensure cross‑browser compatibility and testing, work with Node/MongoDB/AWS, attend weekly standups, and support a fundraising launch. Minimum 4 hours/week commitment.

Design, build, and deliver front-end features with strong UX focus. Own technical design, coding, testing, deployment, and monitoring in a continuous delivery, microservices environment. Collaborate with Product, implement automated QA practices, and contribute to production deployments while practicing robust testing methodologies.

Build, test, and optimize responsive web applications using Next.js and React. Collaborate with designers and back-end developers, implement UI/UX designs, write clean maintainable code, and debug front-end issues to ensure high performance across devices and browsers.

Build and maintain responsive, accessible React/NextJS web interfaces and support Chrome extension development (Manifest V3). Integrate with backend APIs or WebSockets, optimize performance, write tests, perform code reviews, monitor and document extension and web app behavior, and collaborate with cross-functional teams.

Lead frontend development across web and mobile experiences, architecting reusable components, design systems, responsive interfaces, and core user flows. Optimize performance, accessibility, rendering, and conversion while integrating REST and real-time APIs. Collaborate with backend, product, and design teams in two-week sprints, contributing to architecture, testing, monitoring, CI/CD, code reviews, and continuous delivery.

Lead frontend design and implementation for patient and physician products, shape frontend architecture (design systems, state, testing, performance), integrate AI/LLM features with backend/ML teams, and deliver polished, accessible, high-performance interfaces in a hybrid NYC/Boston environment.

Build and own frontend applications for DeFi products using Next.js and TypeScript. Develop reusable component libraries and design systems, integrate Solana programs and wallet infrastructure, and translate complex financial concepts into accessible interfaces. Own performance, reliability, observability, testing, analytics, and end-to-end feature delivery while collaborating with protocol engineers, designers, and product teams.

Lead frontend development for a satellite-data monitoring application serving defense and intelligence customers. Design and implement React and TypeScript features, guide frontend architecture, contribute to backend APIs, mentor engineers through reviews and technical discussions, and collaborate with product managers and designers. Own feature delivery from discovery through deployment while improving state management, data fetching, component design, testing, and frontend best practices.

Build and own LangChain’s React component library and design system. Develop accessible, reusable UI components; translate design tokens and interaction patterns into code; create tooling for theming, versioning, testing, visual regression, and component discovery; and optimize build performance, bundling, dependency management, and package versioning. Collaborate closely with designers, product engineers, and platform teams to maintain a consistent, high-quality frontend foundation.

This role involves leading web platform initiatives, mentoring senior engineers, architecting web applications, and implementing technical strategies for improved performance.

Architect and build a high-performance, low-latency trading web platform. Integrate real-time market data and execution workflows, collaborate cross-functionally on large initiatives, and deliver scalable, performant, user-focused frontend applications with strong attention to API design, tooling, and developer experience.

Develop and maintain responsive web applications using Angular, JavaScript, and TypeScript. Build reusable UI components, integrate REST APIs, translate designs into functional interfaces, and optimize performance, accessibility, and browser compatibility. Troubleshoot issues, participate in testing and code reviews, and collaborate with designers, backend developers, QA, and product teams in an Agile/Scrum environment.

3-month contract Frontend Engineer to build client-facing UIs and integrations for cybersecurity use cases. Collaborate with product, design, and engineering to deliver secure, performant, scalable features, maintain component libraries and automated tests. Remote (GMT+8) role focused on TypeScript and modern web tooling.

Build and own responsive, high-performance React + TypeScript web applications. Design frontend architecture, reusable components, state management, and data-fetching. Collaborate with product and backend teams, optimize performance and accessibility, and improve developer tooling and workflows. Contribute across the stack when needed.

Design and build user-facing components for an AI-native cloud platform, ensuring scalability and performance, mentoring engineers, and optimizing web interfaces.

Design, build, test, and maintain scalable, responsive front-end applications (React/TypeScript). Collaborate with cross-functional teams to implement AI-integrated UIs, optimize performance, and own frontend lifecycle including unit, integration, and end-to-end testing.

The role involves designing and building user interfaces for industrial automation systems, improving frontend architecture, collaborating with backend engineers, and ensuring quality through testing and code reviews.

Provide front-end development support for two national campaigns by building, maintaining, and enhancing responsive web applications and websites. Collaborate with strategy and design teams, implement interactive website features, and develop from wireframes using standards-compliant technologies. The contractor will provide daily on-site support for at least six weeks, with possible longer-term or remote work.

Build and refine front-end experiences for web and mobile: onboarding, checkout, gallery features, design system and enterprise dashboard. Collaborate closely with designers and PMs, ship fast, maintain aesthetic quality, and iterate with user feedback using React, Next.js and TypeScript.

Build high-performance front-end interfaces for generative and agentic AI experiences using React and TypeScript. Develop reusable accessible component libraries, conversational workflows, streaming interfaces, agent execution visualizations, and dynamic outputs. Integrate RAG, ESRE, and orchestration APIs; optimize asynchronous state and real-time response performance; implement UX analytics; and collaborate with designers, product managers, backend engineers, and users. Maintain design-system alignment, accessibility compliance, documentation, and front-end architecture.

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.

Design, build, and optimize responsive, high-performance front-end interfaces for a Web3 DEX using modern JavaScript frameworks and TypeScript. Collaborate with designers, product, and back-end teams to integrate blockchain APIs and smart contracts, mentor junior developers, troubleshoot issues, and contribute to mobile-first/PWA development while ensuring scalability and maintainability.

Lead design and build of internal web visualization tooling for ML and AV teams. Architect scalable React/TypeScript/Vue frontends, collaborate cross-functionally, drive performance and UX best practices, mentor engineers, and deliver mission-critical data-heavy UI systems.

Design and build a scalable, responsive UI; lead frontend architecture and optimization; apply UI/UX best practices; integrate with backend APIs; ensure high web performance and deploy user-facing features.

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.