Top Front End Developer Jobs in Barcelona

Develop frontend JavaScript applications for mobile solutions and devices using ReactJS and related technologies. Collaborate with product owners, UI/UX designers, and engineers to deliver high-quality user experiences and shippable products. Contribute to technical roadmaps, research, mentoring, Agile processes, UI testing, and end-to-end testing.

Build and maintain scalable, accessible, high-performance frontend applications and reusable UI components. Integrate interfaces with REST APIs and WebSockets, troubleshoot memory leaks and performance issues, support production reliability, and contribute to testing, architecture, code reviews, and technical initiatives. Collaborate with Product, Design, Backend, and other teams while mentoring engineers and improving frontend engineering practices. The role is fully remote for candidates located within EMEA.

Frontend Developer Interns will build, test, document, and maintain UI components and pages for Smart TV applications. They will collaborate with backend engineers, product managers, and UX designers, participate in peer reviews and sprint ceremonies, maintain documentation, and support feature deployments. The role emphasizes JavaScript, React, HTML5, CSS3, responsive design, frontend testing, RESTful API integration, accessibility, video playback, and performance optimization.

Own frontend architecture and development for customer onboarding, private-area, billing, savings, and marketing products. Collaborate with international engineering and internal stakeholder teams, deliver customer-facing features, and adapt across business areas in an agile environment. Required expertise includes TypeScript, React, Next.js, GraphQL, CSS-in-JS, testing, and monorepo development. Backend experience with Python, Django, GraphQL, and PostgreSQL is advantageous.

Build and evolve Stripe’s UI platform and design system, including reusable components, themes, frontend APIs, documentation, developer tooling, and automated quality checks. Own frontend projects from scoping through rollout, modernize Dashboard foundations, improve accessibility, internationalization, performance, reliability, observability, and developer experience, and collaborate with designers and engineers.

Build and evolve Synthesia’s marketing website platform, including Astro components, Sanity schemas, design tokens, rendering, SEO, localization, and AI-assisted development tooling. Own features end to end across frontend, server-side systems, APIs, databases, and deployment infrastructure. Translate Figma designs into responsive, accessible experiences, maintain performance and analytics standards, and guide technical direction, code quality, and adoption across website stakeholders.

Lead front-end development for partner-facing financial web products, including embeddable onboarding modules, partner dashboards, and self-service workflows. Build complex multi-step forms and data-heavy interfaces with React and TypeScript, contribute to Node.js server layers, collaborate on API contracts, and work closely with product, design, and backend teams. Own features from design handoff through production release while maintaining multiple codebases and upgrading business-account APIs.

Build and polish complex interactive video-editing features for Studio, including transitions, color grading, element libraries, presets, and customizable keyboard shortcuts. Own frontend-leaning full-stack work from proposal through launch, collaborate in a fast-moving startup environment, and contribute to product decisions and marketing efforts. Deep backend expertise is not required.

Build and scale a return-management product for eCommerce. Solve challenging frontend problems, own software from infrastructure to product, collaborate with product and e-commerce leaders, iterate quickly, and contribute to a high-performance engineering team in Barcelona.

Lead iOS development for a React Native application, integrating native SDKs, privacy technologies, analytics, advertising, authentication, and deep linking. Build the CircleCI and fastlane release pipeline, manage App Store submissions, write native Swift or Objective-C modules, maintain cross-platform compatibility, and oversee Jest and mobile end-to-end testing. Collaborate with product and backend teams while reviewing code and sharing iOS expertise.

Owns growth engineering initiatives across acquisition and conversion journeys, including landing pages, signup, checkout, subscriptions, and product launches. Builds fast, accessible front-end experiences using TypeScript, React, and Next.js, while contributing to Kotlin or Python backend services. Partners with marketing, CRM, product, design, and analytics teams; runs A/B tests; measures conversion outcomes; contributes to the design system; and ships continuously with monitoring and 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.

Build and maintain frontend platform tooling across React web and React Native applications. Develop reusable cross-platform libraries, establish technical standards, guide the team roadmap, support technology migrations, and improve development workflows. Mentor engineers in Barcelona, represent Client Platform across the organization, and promote quality through testing, observability, monitoring, and effective use of AI-assisted development.

Develop and maintain Keet Desktop, a cross-platform peer-to-peer communications application built with React and the Pear runtime. Responsibilities include implementing UI/UX, optimizing performance, writing maintainable and tested code, debugging complex frontend applications, and contributing to decentralized communication technology. The role involves collaboration within a remote global team and may include desktop application, real-time communication, and open-source development.

Develop and maintain Keet Desktop, a cross-platform peer-to-peer communications application built with React and the Pear runtime. Responsibilities include implementing UI/UX, optimizing performance, writing maintainable and tested code, debugging complex frontend applications, and contributing to decentralized communication technologies in a globally distributed remote team.

Lead two distributed frontend engineering squads responsible for Grafana’s frontend platform and navigation. Manage and develop senior engineers, oversee hiring and planning, shape technical direction, partner with Product and Design, and own delivery from discovery through rollout. Improve engineering productivity through AI and automation, uphold quality and security standards, support customer and community discovery, and participate in engineering management on-call while driving reliability improvements.

Develop scalable, responsive web applications with React.js, translating designs into accessible, high-quality interfaces. Responsibilities include frontend architecture, state management, performance optimization, API integration, automated end-to-end and unit testing, code reviews, troubleshooting, documentation, and collaboration with backend developers. The role also requires staying current with frontend technologies and contributing to architectural and development best practices.

Build and improve frontend platform capabilities, developer tooling, Golden Paths, CI/CD, deployment workflows, and application architecture. Improve frontend delivery, performance, caching, observability, testing, and developer experience across the stack. Operate production systems, participate in incident response and technical discussions, establish practical standards, and collaborate with product engineers, platform teams, and technical leaders.

Own the frontend architecture and production delivery of a multi-brand consumer platform built with React, Next.js, and TypeScript. Responsibilities include creating a configurable multi-brand system, owning a design system and component library, converting AI-built prototypes into production features, using AI coding agents, and ensuring high UI quality, performance, accessibility, and Core Web Vitals. The role requires autonomous end-to-end ownership and daily production coding.

Leads and mentors a frontend engineering team while remaining hands-on with coding, architecture, code reviews, and technical delivery. Owns migration to Nuxt.js and server-side rendering, performance engineering, Core Web Vitals, and technical SEO. Manages team performance, career development, and work allocation while collaborating with product, backend, and cross-functional stakeholders to deliver scalable, high-quality software.

Develop frontend interfaces and A/B experiments for a health-focused AI product using Vue 3, TypeScript, and Vite. Improve design systems and AI-assisted development workflows, own features from concept through production, collaborate across engineering, design, product, and analytics, and optimize performance, reliability, and development velocity using user data and experimentation results.

Develop and maintain responsive frontend applications using TypeScript, integrate APIs and services, implement UI/UX designs, optimize performance and scalability, apply frontend security and data protection practices, troubleshoot issues, participate in code reviews, and contribute to open-source privacy-focused projects.

Build and own frontend experiences for Perk Events, a multi-sided group travel and events platform. Define product direction, architect scalable solutions, improve technical quality, manage technical debt, and lead cross-team initiatives. Mentor engineers, raise engineering standards, contribute to design documents, and collaborate with product managers, engineering managers, and architects to deliver impactful customer experiences.

Own end-to-end frontend delivery for AI-powered healthcare products across patient, clinician, and administrative applications. Develop and maintain a large Angular codebase, design scalable architectures, write tested code, improve performance and platform health, and contribute to Nx monorepo, CI/CD, and framework upgrades. Build interfaces for AI features while using agentic development tools. Collaborate cross-functionally and work across API, backend, and SQL layers when needed.

Build and own complex, high-performance frontend experiences for observability products using Angular or another major frontend framework. Lead frontend architecture, translate complex data into intuitive interfaces, collaborate cross-functionally, write tested production code, review code, mentor engineers, and drive features from concept through production.