Top Front End Developer Jobs in Barcelona

Design and build payment UI components, pages, and merchant/admin dashboards. Translate business requirements into intuitive interfaces, optimize payment flows, leverage AI tools to accelerate frontend work, collaborate with backend engineers, and help evolve the product and tech stack.

Full-stack Developers at QuantCo build user interfaces for machine learning solutions, collaborating with data scientists and engineers to deliver actionable products.

Build user-facing features with React and TypeScript, implement responsive UIs from Figma, collaborate with design, deploy via continuous deployment, learn Node.js/backend, use AI coding tools, and ship production-ready features while receiving mentorship.

Build and ship performant, polished frontend features using React/TypeScript. Refactor code incrementally, implement smooth animations, contribute to backend Node.js APIs when needed, use AI-assisted tools, own production deployments, and collaborate directly with CTO/CPO on product and design.

Join Cerebras Systems to optimize and develop frontend compiler infrastructure for PyTorch models on their unique wafer-scale AI platform, focusing on model representation and optimization.

Build, test, and optimize responsive web applications using Next.js and React. Collaborate with designers and back-end engineers to implement high-performance, cross-browser UIs, manage state with Redux/Context API, integrate RESTful APIs, and debug front-end issues while following best practices and maintaining clean, scalable code in a remote team.

Build and maintain modern dashboard UIs using React and TypeScript. Implement canvas-based generative AI pipelines, integrate async pipelines via WebSockets, ensure performance for large media datasets, shape UX decisions, and define data contracts with backend teams.

The role involves developing high-quality Vue.js applications, creating interactions, collaborating with back-end engineers, and writing tests.

Build and maintain responsive, high-performance user interfaces using React and modern front-end technologies. Translate UI/UX designs into reusable code, integrate with backend APIs, optimize performance and cross-browser compatibility, and contribute to testing, code reviews, and engineering best practices in a product-driven, remote environment.

Senior front-end Drupal developer to design, develop, implement, and maintain Drupal 8 websites. Build responsive sites (Bootstrap), code in PHP/HTML/CSS/JavaScript, integrate REST APIs, use Git, and work with MySQL/MariaDB. Use wireframing/modeling tools and apply automated testing, deployment processes, and CI. Remote contractor, must work New York time and be fluent in English.

As a Senior Angular Frontend Engineer at Fever, you will design and implement web experiences while collaborating with cross-functional teams to enhance performance and scalability. You'll take ownership of core components and contribute to best practices in system design, driving improvements and mentoring others.

Develop high‑traffic web applications and self‑serve conversion flows (discovery → quote → signup), build and optimize alan.com and marketing acquisition systems, collaborate with Marketing/Sales/Product/Data/Design, and deliver measurable improvements that drive member acquisition and revenue using the company stack.

Own and ship frontend features end-to-end with a product mindset: onboarding, activation, dashboards, and billing UI. Build AI-first experiences, instrument features (analytics, events, dashboards), run A/B experiments, collaborate with backend and cross-functional teams, mentor engineers, and maintain clean, well-tested React code.

Serve as a senior Java full-stack engineer building and maintaining backend services for blockchain applications, integrate APIs with React/Vue frontends, design scalable enterprise blockchain solutions, troubleshoot complex backend issues, and collaborate with cross-functional teams to apply best practices.

The role involves building creative tools for content editing, enhancing features with PixiJS and WebGL, and improving collaboration workflows.

Build and ship full-stack features for North, develop autonomous agents that access sensitive enterprise data, productionize state-of-the-art models, write minimal, secure low-resource code, and collaborate with researchers to deploy performant RAG/agentic applications while prioritizing security and user experience.

Design and implement complex customer-facing frontend features using TypeScript and React. Provide technical leadership, mentor junior engineers, drive frontend architecture and best practices, improve performance and accessibility, partner with product/design, integrate with backend APIs, and manage technical debt and scalability.

Build and maintain user-facing features and interfaces for Restream web services. Design and implement UI and business logic, collaborate with product designers and engineers, perform code reviews, improve reliability and scalability, and evaluate emerging technologies.

Frontend-focused product engineer building high-quality SaaS user experiences. Work in cross-functional squads to own UI, interaction patterns, performance, accessibility, prototyping, instrumentation, and feature rollouts. Primary frontend work with openness to backend or mobile tasks, using AI-assisted coding and agile practices.

Develop and maintain Ubegos frontend products: mobile/web quest experiences, user and creator dashboards, admin panel, marketing features, and third-party integrations. Work in one-week Scrum sprints, perform code reviews, contribute to software architecture, and use modern frontend frameworks, relational databases, and AI-assisted coding tools.

As a Frontend Engineer at Proton, you will develop features for Proton Drive, collaborate with teams, conduct code reviews, and implement testing strategies.

As a Frontend Engineer, you will develop new features for Proton's services, collaborate with teams, ensure code quality, and implement testing strategies.

Develop and maintain resilient front-end components for Proton VPN, collaborating with engineering teams to enhance user experience and system performance.

Proton seeks a Senior Frontend Engineer to develop React components, lead complex projects, and enhance B2B product functionality while promoting privacy-oriented solutions for businesses.

The Senior Frontend Engineer will develop and support innovative privacy-centric tools, ensuring seamless user experiences and collaborating with teams to enhance product features while managing software quality and team mentorship.