Front End Developer Jobs in Cambridge, MA

Senior Front End Software Engineer responsible for architecting, building, and maintaining high-performance applications across frontend, backend, cloud, and event-driven systems. The role leads complex technical initiatives, integrates AI and data pipelines, ensures software quality through testing and reviews, owns applications throughout their lifecycle, documents architecture, collaborates cross-functionally, and mentors engineers. Primary technologies include TypeScript, JavaScript, React, Node.js, AWS, and modern CI/CD and containerization practices.

Leads frontend software development across strategic product domains, designing and building dashboards, notifications, reporting interfaces, and intelligent automation. Independently drives complex technical projects, integrates AI models and data pipelines, improves performance, writes automated tests, conducts code reviews, documents architectures, owns applications throughout their lifecycle, and mentors engineers. Collaborates with cross-functional stakeholders to deliver scalable tools for real estate agents.

Build and maintain React and TypeScript web applications for EEG analytics, clinical study management, and at-home patient diagnostics. Own user experience, performance, reliability, and observability while designing data-rich workflows and interactive visualizations. Collaborate asynchronously with product designers and cross-functional teams, contribute to roadmap direction, and develop scalable GraphQL consumers. The role involves supporting clinical operations, physician workflows, and diagnostic reporting.

Principal Frontend Engineer responsible for defining and governing large-scale frontend architecture across clinical applications. Leads modernization from fragmented systems to a React-based platform using JavaScript, TypeScript, Node.js, GraphQL, and shared component standards. Drives migration strategy, technical governance, performance improvements, AI-assisted development tooling, and cross-team alignment while mentoring engineers. Advises on CI/CD, AWS infrastructure, Oracle integrations, legacy Perl utilities, security, hiring, and long-term workforce planning.

Lead frontend architecture and delivery for React-based clinical applications. Mentor engineers, establish component libraries and coding standards, integrate GraphQL and REST APIs, support Node.js tooling and server-side rendering, lead migration to a unified architecture, and drive testing, performance, accessibility, deployment readiness, and cross-functional technical alignment.

Develop and maintain scalable React and TypeScript frontend applications for clinical healthcare workflows. Build reusable accessible components, integrate GraphQL and REST APIs, migrate legacy architectures, optimize performance, troubleshoot UI issues, and support testing, deployment, documentation, and engineering standards. Collaborate with product, design, and backend teams while using Node.js, AWS, and related tooling to deliver a unified frontend platform.

Lead frontend architecture and implementation for an AI-driven platform: build performant, responsive React/TypeScript applications, manage complex state and real-time updates, establish component libraries, testing, CI/CD, mentor junior engineers, and drive frontend best practices and scalability.

Own the technical direction and architecture of WHOOP’s growth-focused web experiences, including join flow, checkout, and shop. Lead cross-functional projects, design A/B tests, improve performance and accessibility, integrate payment and ecommerce systems, and ensure reliability through monitoring and incident response. Mentor engineers, review technical plans and code, lead postmortems, and contribute to engineering processes and documentation.

Build and maintain performant, responsive, mobile-first web applications using Next.js, React, and Tailwind CSS. Translate product goals into polished member-facing experiences, prototype and ship features with AI-assisted workflows, integrate RESTful APIs, and collaborate with product, design, and backend teams. Establish frontend best practices for architecture, accessibility, performance, and maintainability while contributing to UX decisions and navigating ambiguous problems.

Develop and enhance LangSmith frontend features using React and TypeScript. Build reusable components, translate designs into high-quality interfaces, optimize performance across browsers and devices, and collaborate with backend, full-stack, and UX/UI teams to improve usability and product quality.

As a Frontend Software Engineer, design, develop, and deploy web applications, collaborate with UX engineers, and implement user-friendly interfaces.

Develop and maintain scalable frontend solutions using JavaScript, Angular, and React. Collaborate with cross-functional teams, contribute to architecture, conduct code reviews, uphold security and performance standards, and support cloud-based platforms. Diagnose technical issues, improve system reliability, mentor teammates, and promote DevOps, continuous delivery, design patterns, and software engineering best practices.

Build and maintain high-performance Vue.js interfaces controlling automated restaurant robotics. Develop real-time WebSocket communication, manage complex reactive state, translate Figma designs into intuitive tools, and optimize frontend performance under heavy data loads. Collaborate with software, hardware, product, and design teams while learning additional technologies such as Elixir and Phoenix.

Develop user interfaces for air traffic systems, focusing on map-based applications and real-time data processing.

Develop and scale frontend-focused full-stack applications for underwriting teams. Responsibilities include building high-performance Next.js interfaces, contributing to Node.js and NestJS backend services and RESTful APIs, applying testing and OOP practices, architecting reliable systems, and collaborating with design, product, backend, and underwriting teams throughout development and deployment.

Develop and maintain frontend components for transaction forms and eSign products using React and modern web technologies. Write tested, secure, high-performance code; improve monitoring and operational reliability; participate in on-call rotations, code reviews, planning, and design discussions. Deliver features independently, collaborate on complex designs, and become a subject matter expert on internal components while partnering cross-functionally with product and design teams.

Lead frontend-focused software architecture and development for a scalable real estate transaction platform. Own complex technical projects, improve reliability and operational excellence, reduce technical debt, and integrate AI, data pipelines, telemetry, and automated delivery practices. Collaborate with product and design teams, influence business decisions, mentor and recruit engineers, and build fault-tolerant, well-tested systems using modern frontend and cloud technologies.

Build mission-critical frontend features for civil aviation: develop fast, maintainable React/TypeScript interfaces, real-time map-based visualizations with Mapbox/Maplibre/Google Maps, and leverage WebGL/WebGPU/ThreeJS and WebAssembly for accelerated rendering and performance.

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 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.

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

As a Staff Software Engineer at SimpliSafe, you will lead the development of e-commerce solutions, mentor engineers, and enhance customer experiences through innovative software solutions. Your role includes collaborating across teams and leveraging modern technologies to ensure successful project delivery.

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.

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.

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.