Top Front End Developer Jobs in Madrid

Own complex frontend features across web and mobile, design React and React Native systems, improve rendering and runtime performance, and build maintainable shared abstractions. Collaborate with product, backend engineering, and QA to deliver simple user experiences. Maintain quality through code reviews and unit, end-to-end, and visual-regression testing while mentoring colleagues and improving frontend engineering standards.

Shape frontend architecture and technical direction across React, React Native, and an Nx monorepo. Own shared libraries, platform capabilities, design-system foundations, developer tooling, performance, testing, migrations, and developer experience. Diagnose systemic web and mobile issues, remain hands-on with implementation and investigation, influence cross-team decisions, partner with product and engineering, and mentor senior engineers while improving reliability and product quality.

Own complex frontend features across web and mobile, design React and React Native systems, improve rendering and runtime performance, and build reusable abstractions. Collaborate with product, backend, and QA teams to deliver simple user experiences. Maintain quality through code reviews and unit, end-to-end, and visual-regression testing. Mentor colleagues and help raise frontend engineering standards.

Shape frontend architecture and engineering direction across React, React Native, and shared monorepo teams. Own platform capabilities, shared libraries, design-system foundations, developer tooling, performance, testing, migrations, and developer experience. Diagnose systemic web and mobile issues, remain hands-on with implementation and technical investigation, influence cross-team decisions, partner with product and QA, and mentor senior engineers. This is an individual contributor role focused on sustained organizational impact rather than people management.

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 modernize Productboard’s frontend platform, migrating its legacy design system to Spark UI. Design AI-ready module boundaries, API contracts, documentation, and agent workflows involving tool use and autonomous execution. Develop high-performance React applications, validate experiments with users, collaborate with product and design teams, own features through production, mentor engineers, and share engineering knowledge across the organization.

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.

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.

As a Senior Front-End Software Engineer, you'll design and implement services, contributing to the architecture and product strategy in a fast-paced environment.

Build and architect high-performance, data-rich interfaces using React and TypeScript for observability products. Own frontend architecture, state management, component patterns, visualization, testing, and performance across massive datasets. Collaborate with product, design, and backend teams to deliver user-facing features, leverage AI coding tools, advocate for user experience, and mentor engineers. Experience with observability, OpenTelemetry, cloud-native technologies, and startup environments is advantageous.

The Senior Frontend Engineer will optimize and refine existing code, implement UX/UI improvements, and maintain high code quality, working autonomously and collaboratively with designers and engineers.

SynergyOS seeks software engineers for backend, frontend, and DevOps roles to build a productivity platform for enterprises, enhancing office workflows.

The role involves designing, building, and implementing new services, working closely with the product team, and taking ownership of projects from 0 to 1.

Build and improve Restream’s web interfaces and user-facing features for the AI Clips team. Design UI and business logic, collaborate with product designers, participate in code reviews, improve system reliability, and evaluate emerging technologies. The role requires strong JavaScript and TypeScript expertise, advanced React knowledge, CSS preprocessor experience, and familiarity with backend development, cloud infrastructure, containers, and continuous deployment.

Develop server-side applications using Kotlin and Java, collaborate with teams to enhance Atlassian plugins, and ensure code quality through testing and reviews.

Lead ownership of the frontend experience from design through deployment and operations. Ship features collaboratively, drive technical and UX decisions, maintain strong automated test coverage (unit/integration/e2e), improve frontend observability, and help migrate a hybrid Backbone/Node codebase toward modern React/TypeScript.

As a Frontend Engineer, you will build and enhance frontend solutions for financial configurations, develop internal tools, and create customer-facing interfaces, ensuring high performance and quality in financial applications.

Design and implement developer-facing UI from Figma to production using Hotwire (Turbo + Stimulus) and ViewComponents. Own the dashboard, API playgrounds, docs, marketing site, and data visualization. Optimize performance and bundle size, maintain a coherent component system, and ship polished, production-ready front-end with tests and CI/CD.

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

Design, build, and maintain performant React/Redux/Vite web applications and data-visualization portals. Collaborate across teams to implement features and RESTful APIs, write tests, perform code reviews, debug complex issues, follow agile and CI/CD practices, refine UX details, and adopt tooling to speed development.

Design and develop front-end solutions using JavaScript frameworks (React/Angular/Vue). Collaborate with stakeholders to define solutions, support product engineering leads in agile ceremonies, mentor junior engineers, and maintain reliable, reusable code while understanding component interactions and CI/CD processes.

Develop and maintain front-end Drupal 8/9 themes, custom templates and libraries; implement full-lifecycle Drupal solutions; propose user-friendly layouts and improvements; perform feature gap analysis; support automated testing, CI, and deployment processes.

Remote front-end Drupal developer responsible for building Drupal themes, custom templates and libraries; developing and maintaining Drupal 8/9 implementations; proposing user-friendly layouts and improvements; performing feature gap analysis; and supporting responsive UI/UX using frameworks and CI/deployment/testing workflows.

Develop, implement, and maintain Drupal 9 front-end websites; perform feature gap analyses, build custom features for migrations, provide post-migration support, integrate REST APIs, and support CI/CD and automated testing processes.

Develop, implement, and maintain Drupal 9 front-end websites, perform feature gap analyses, build custom features to support migrations, and provide post-migration support. Work with responsive frameworks, REST APIs, Git, automated testing, CI/CD, and Agile delivery.