Top Senior Front-End Engineer Jobs in San Francisco, CA

Build and improve ClickUp’s core product experiences using Angular and React. Responsibilities include architecting reusable frontend code, collaborating with product, design, backend, integrations, and QA teams, improving performance and usability, maintaining unit and integration tests, resolving complex bugs, following state-management patterns, and mentoring teammates in a fast-paced environment.

Founding front-end engineer to design and build Flick's editor UI (canvas, timeline, node graph, playback). Lead architecture, prototype creative workflows, optimize complex UX interactions, establish code quality and performance practices, collaborate with design/product/AI backend, and drive key technical and product decisions.

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

Lead frontend development for Sift Agents, building high-performance, agentic AI user experiences. Own product area from customer discovery through shipping, design interaction patterns for streaming and long-running agent tasks, render agent findings alongside large telemetry datasets, optimize browser performance (Web Workers, OPFS, WebAssembly), contribute to component library, and collaborate with backend engineers on API design.

Lead the design and implementation of a flagship product, define technology best-practices, and mentor the product team while working with rich datasets from Fortune 500 clients.

The Sr. Software Engineer (Front End) will design and develop front-end solutions using various frameworks, ensure performance optimization, and guide TDD best practices.

The Senior Front End Engineer will utilize expert knowledge of JavaScript and web technologies to develop user interfaces, ensuring quality and performance. They will work with various JavaScript libraries and handle service-based architectures, while focusing on responsive design and mobile web development.

As a Senior Frontend Engineer, you'll build high-performance applications, collaborate with teams on user experience, and ensure coding security.

The Senior Frontend Engineer will develop and enhance the Navigator platform using Vue.js, improve user experience, maintain CI/CD workflows, and collaborate with cross-functional teams.

Lead full‑stack engineering projects to scale document ingestion, design multi‑jurisdiction data collection, and build government‑grade security. Deliver AI‑native features across web, desktop, mobile, editors, and APIs. Ship full‑stack solutions using React/TypeScript frontend and Python/Postgres backend while ensuring scalable, extensible architectures that delight enterprise customers.

Own and architect the frontend foundation for Handshake AI Enterprise: establish component system, design tokens, engineering patterns, shared libraries, and ship production-grade UIs while collaborating with AI and platform teams to ensure scalable, maintainable, high-performance enterprise deployments.

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 elegant, responsive frontend features and visualizations using modern frameworks. Own substantial product areas from design to launch, collaborate with product, UX, and backend teams, and optimize performance and interactivity for large-scale data applications.

Implement test-driven frontend features from visual designs using AngularJS/JavaScript. Integrate UI with RESTful backends, refactor modules, perform peer code reviews, and collaborate with backend, QA, and support teams in an Agile environment.

Design and build user-facing web interfaces from mockups using HTML, CSS, and JavaScript. Implement interactive features, ensure responsive and accessible cross-browser experiences, optimize performance, test and debug code, maintain existing applications, and collaborate with back-end developers for integration.

Lead end-to-end implementation of high-fidelity, performant, and accessible frontend features for a realtime collaborative visual canvas. Translate designs into polished interactions, optimize performance and accessibility, collaborate with PMs, designers, and backend engineers, and shape frontend best practices and design systems.

Lead end-to-end front-end development for an enterprise Agentic AI platform. Design interactive, explainable UIs that render streaming LLM outputs, code citations, dependency graphs and authoring workflows. Build real-time experiences with WebSockets/streaming APIs, ensure traceability to source code, collaborate with AI engineers and designers, and drive accessibility, performance, and observability across a FedRAMP-aligned federal deployment.

Build and implement user-facing web interfaces from designs using HTML, CSS, and JavaScript. Create interactive, responsive, and accessible features, optimize performance, ensure cross-browser compatibility, test and debug code, maintain existing applications, and collaborate with back-end developers for integration.

Build and maintain TypeScript/React frontends and SDKs for the Nomina web3 platform, create user-facing dapps, improve developer documentation and DX, and collaborate with product and engineering to deliver high-quality, mobile-friendly features.

Own and build the JTX frontend across web and mobile: real-time order books, charts, order entry, positions, wallet/signing flows. Optimize for low-latency streaming data, performance, security, and cross-platform consistency while making long-term architectural decisions and shipping rapidly.

Lead frontend architecture and execution for high-traffic Search features using React and TypeScript. Build map-based visualizations, optimize client-side performance and state management, collaborate with product/design/backend, conduct code reviews, mentor peers, and ship production-grade web features.

As a Software Engineer, you will lead frontend projects, enhance user experience, and collaborate on innovative AI-driven products.

Develop and enhance user-facing features for an LLM observability platform using React and TypeScript. Build reusable components and front-end libraries, translate designs into performant UI code, optimize cross-device/browser performance, and collaborate with backend engineers and designers to improve usability.

Build and ship features for Cohere’s North AI workspace platform, develop autonomous agents that interact with sensitive enterprise data, and deploy highly performant, secure applications in low-resource environments. Collaborate with researchers to productionize advanced AI models and techniques while contributing across the full stack using Python and React.

Lead development of interactive React front-ends with Chakra UI and Mapbox, build data visualizations (Plotly/ApexCharts), optimize performance for large and real-time datasets, enforce front-end best practices, mentor engineers, and collaborate with product, design, and backend teams to deliver accessible, responsive interfaces.