Top Senior Front End Developer Jobs in Seattle, WA

Build and own scalable, high-performance frontend experiences for growth, including websites, funnels, campaign platforms, personalized journeys, and AI-powered tools. Lead end-to-end delivery, optimize performance and conversion through experimentation, and collaborate with Product, Design, Marketing, Data Science, and Backend Engineering. Improve frontend architecture, reusable components, accessibility, SEO, and engineering quality while mentoring teammates and solving ambiguous business problems.

Build robust, scalable frontend applications for Deploy’s data and enterprise products. Collaborate with design, product, and engineering teams to deliver high-quality user experiences, participate in product decisions, improve team efficiency, and secure code using OWASP practices. The role requires strong JavaScript, HTML, CSS, React, Redux, software design, testing, communication, and independent decision-making skills.

Own the frontend architecture and implementation of a greenfield legal technology product using React and TypeScript. Build complex workflow experiences, reusable components, state management, forms, validation, API integrations, role-aware interfaces, AI-enabled workflows, and automated tests. Ensure accessibility, performance, responsiveness, browser compatibility, and production quality. Partner with backend, product, and design teams, establish frontend standards, review code, and provide technical guidance to other developers.

Own and deliver web frontend products at Uber scale, partnering with stakeholders and cross-functional teams. Build applications using React, GraphQL, Flow, CSS-in-JS, Node.js, and Uber’s frontend frameworks. Measure feature experiments, collaborate with Data Science and Product teams, and iterate on user experiences. Mentor junior engineers, provide technical leadership, and ship high-quality features on schedule.

Build and refine customer-facing React features and internal dashboards, implement TypeScript-based UIs in strict mode, integrate frontend with backend APIs, and contribute to product and design decisions for an AI-driven scheduling assistant.

Develop and deploy scalable, high-performance customer-facing web applications using Svelte and SvelteKit. Build Sanity CMS and headless content experiences, reusable UI components, API integrations, and cloud-native solutions. Collaborate with product, UX, architecture, platform, and DevOps teams; ensure accessibility, SEO, security, testing, and performance. Participate in Agile delivery, production support, and technical decision-making while mentoring junior developers.

Lead architecture and implementation of scalable, performant advertiser-facing web experiences. Drive frontend platform modernization, AI-enabled engineering practices, shared frameworks, and cross-team technical alignment. Mentor engineers, run architecture reviews, and improve performance, accessibility, observability, and developer productivity.

Build and optimize frontend advertising experiences and rendering libraries across platforms. Collaborate with design, product, and partner teams on UX, analyze ad-stack performance using data and monitoring systems, and drive improvements across complex, multilingual, multi-region, cross-platform web applications.

Architect and build a high-performance trading platform for active traders. Develop responsive web interfaces integrating real-time market data, low-latency execution workflows, and advanced trading tools. Collaborate with cross-functional engineering teams on large-scale initiatives, emphasizing scalability, performance, API quality, maintainability, developer experience, and end-user usability.

Lead frontend engineering for large-scale React web applications. Architect application patterns, structure, libraries, and coding standards; build React applications end to end; conduct code reviews; mentor engineers; promote performance, scalability, and maintainability; and collaborate with designers, product managers, and technical and non-technical stakeholders.

Lead front-end engineering for enterprise transportation applications using React, TypeScript, and Material UI. Responsibilities include front-end architecture, reusable component development, accessibility, responsive design, API integration, SQL troubleshooting, testing, CI/CD, code reviews, mentoring, Agile planning, modernization, and production support. The role independently leads features from requirements through deployment while collaborating with designers, product owners, analysts, engineers, testers, DevSecOps teams, and government stakeholders.

Build the realtime, HIPAA-compliant messaging and collaboration frontend ('Pulse') that makes an AI colleague feel human. Implement complex interactive data visualizations, micro-interactions, and high-performance accessible interfaces. Work embedded with product and design, own UI quality, iterate on AI-driven specs, and deliver production frontend experiences clinicians will trust.

Build and operate customer-facing frontend experiences for search, recommendations, and generative AI. Own software development end to end, including architecture, implementation, testing, delivery, observability, and long-term evolution. Collaborate with backend, machine learning, product, and design teams; review code, advise on technical designs, participate in interviews, and mentor engineers. Improve performance, scalability, accessibility, maintainability, and developer experience across complex frontend systems.

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 and operate full-stack applications, customer portals, APIs, and backend services supporting usage metering, billing, provisioning, and cloud marketplace integrations. Develop primarily with TypeScript and React, alongside Golang and Node.js services. Lead technical design, improve reliability and observability, optimize CI/CD, participate in on-call, mentor engineers, and coordinate cross-functionally. Own production behavior across distributed systems, including reconciliation, rollout controls, monitoring, and recovery procedures.

Design, build, deploy, and maintain secure, scalable Java and Spring Boot services for a multi-tenant ecommerce SaaS platform. Develop REST APIs, optimize MySQL databases, operate AWS workloads, and support CI/CD, observability, testing, and production systems. Contribute to architecture and technical decisions, mentor engineers, troubleshoot issues, and participate in on-call support while ensuring PCI DSS compliance and responsible use of AI-assisted development tools.

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.

Set the technical direction for data visualization, translate strategy into shipped features, and build high-quality frontend visualization components and supporting data pipelines. Partner with product and engineering teams, improve visualization performance, mentor engineers, and iterate rapidly based on customer feedback. The role requires strong TypeScript or JavaScript skills, deep data visualization experience, familiarity with analytics tools, and proficiency with AI coding workflows.

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.

Lead frontend engineering for the DataLab product, developing scalable React and TypeScript interfaces for enterprise financial applications. Guide frontend architecture, component design, accessibility, performance, developer experience, and testing practices. Collaborate with product managers and backend engineers, mentor teammates, make technical decisions, and promote AI-assisted coding tools while maintaining high standards for security, quality, and maintainability.

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 lead customer-facing eCommerce booking features using React, Next.js, and TypeScript. Own checkout, payments, scheduling, and partner booking flows; improve conversion, accessibility, performance, observability, and reliability. Integrate commerce and third-party services, develop automated tests, support frontend architecture, instrument experiments and analytics, and monitor production outcomes. Collaborate across Product, Design, Marketing, and Backend teams while mentoring junior engineers and contributing to shared components and API contracts.

Build and own frontend product experiences for exploring, visualizing, sharing, and embedding data. Design and implement APIs, SDKs, and interfaces consumed by external customers. Partner with product, design, engineering, and customers to scope integrations, ship iteratively, and represent embed customer needs. The role requires strong JavaScript and TypeScript skills, independent delivery of production software, familiarity with data or business intelligence tools, and proficiency with AI coding workflows.

Build responsive Web3 applications, web SDKs, developer tools, reusable frontend components, and internal Customer Success tools. Collaborate with Product, Design, and Engineering to create scalable, accessible user experiences. Contribute to code and design reviews, automated testing, continuous delivery, coding standards, and AI-assisted development practices.

Senior frontend-focused software engineer responsible for authentication, verification, and fraud experiences across web, mobile, and backend systems. The role owns team goals, designs and delivers highly available systems, collaborates with product and design partners, improves engineering standards, supports operations and on-call efforts, and mentors engineers. Candidates should have strong web application architecture experience, proficiency with React or Vue and JavaScript or TypeScript, and excellent communication skills.