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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Frontend Web Application Developer - **Company:** Malwarebytes - **Location:** Álava, Spain - **Contract:** Permanent contract - **Skills:** JavaScript (Programming Language), Web Accessibility, Artificial Intelligence, Application Performance Management, HTML5, Unit Testing, Cascading Style Sheets (CSS), Software Quality, Code Review, Video Game Development, Design of User Interfaces, Scrum Methodology, Phishing, Systems Integration, Web Content Accessibility Guidelines, Web Applications, Tailwind, ReactJS, Cypress (Programming Language), Pixel Perfect, Malware, Backend, Git, Webpack, Material UI, Integration Tests, Build Tools, Figma, Front End Software Development, React Redux, React Testing Library, Restful APIs - **Published:** September 8, 2026 - **Apply:** https://www.buscojobs.com.es/senior-frontend-web-application-developer-en-alava-ID-369307511 ## About the Role including load times, rendering, and overall user experienceSupport your fellow team members: mentor junior developers, proactively communicate, and conduct thorough code reviewsStay current with emerging frontend technologies and advocate for their adoption when appropriateWork as a team to ensure everyone meets their goalsSkills You'll Need to Have:3-5+ years of professional experience in frontend web developmentStrong proficiency in HTML5, CSS3/SCSS , and modern CSS frameworks (e.g., Tailwind CSS, Styled Components, CSS Modules)Hands-on experience working with Figma and collaborating with designers to implement UI/UX designsDemonstrated ability to prototype and build UI components independently from design systems or minimal design directionExperience building and maintaining component libraries and design systemsExperience with state management solutions (Redux, Zustand, React Context, or similar)Proficiency in modern frontend build tools and bundlers (Webpack, Vite, etc.)Experience with testing frameworks such as Jest, React Testing Library, Cypress, or PlaywrightFamiliarity with RESTful APIs and integrating frontend applications with backend servicesExperience with Git version control and collaborative development workflowsUnderstanding of web accessibility standards (WCAG) and best practicesExperience owning a project from concept to production, including proposal, discussion, and executionSelf-motivated and self-managing, with strong organizational skillsComprehensive medical insurance coverageEmployee Referral Bonus ProgramWellness programsAn opportunity to do something great for yourself and the world! ## Description Senior Frontend Web Application DeveloperAbout this positionHere at Malwarebytes, we believe that when you're free from threats, you're free to thrive.It all started in **** with one person who needed help with a malware infection, and a community coming together to find solutions.In that moment in time a product was born for all people, with a mission to rid the world of malware.Our product has since grown and evolved, from removing malware, to protecting devices, to ever-changing prevention.About Malwarebytes Inc.Malwarebytes began after our founder, Marcin Kleczynski, accidentally infected his parents' computer while downloading a video game as a teenager.At the time, there was no product that could fully solve the problem, so he set out to build one.That early experience shaped our mission: to create protection that works when people need it most.Since then, the digital threat landscape has only grown more complex.Attackers are faster, stealthier, and more sophisticated, while traditional solutions often overwhelm people with complicated tools and settings.At Malwarebytes, we believe protection should be both powerful and refreshingly simple because if security feels too hard to use, people will not use it.That is why our aspiration is always to stay one step ahead: cutting through the noise, stopping threats others miss, and delivering peace of mind in an unpredictable digital world.About ThreatDownThreatDown, the corporate business unit of Malwarebytes, is redefining cybersecurity for growing businesses with solutions that stop ransomware, malware, phishing, and AI-powered attacks.Our platform is trusted, intuitive, and built for lean IT teams that need speed without complexity.At ThreatDown, you'll join a team driven by innovation, resilience, and a passion for empowering businesses to thrive securely.If you're ready to make a real impact in cybersecurity, we'd love to meet you.Malwarebytes/ThreatDown is looking for..We're not looking for people who know all the answers; we want people who can think creatively and are not afraid to bring forward new ideas.The problems we solve are meaningful, exciting, and constantly evolving.You'll work together with other engineers in a fast-paced, agile environment, to build beautiful, responsive, and high-performance web applications.Your code will protect millions of customers from emerging threats and will restore their confidence in using their devices.Our consumer engineering team is looking for a Senior Frontend Web Application Developer ready for the challenge of delivering exceptional user experiences to our customers.What You Will Do:Build and maintain highly responsive, accessible, and performant frontend web applications that serve millions of usersCollaborate closely with designers through Figma to translate designs into pixel-perfect, production-ready codeProactively create UI components, prototypes, and design implementations when dedicated design resources are unavailableDevelop and maintain a scalable design system and component library to ensure consistency across applicationsParticipate in our agile/scrum process, contributing to sprint planning, code reviews, and retrospectivesEnsure code quality through comprehensive unit testing, integration testing, and end-to-end testingCollaborate with Product, UX, and QA to deliver an ambitious roadmap on time and with high qualityOptimize application performance, including load times, rendering, and overall user experienceSupport your fellow team members: mentor junior developers, proactively communicate, and conduct thorough code reviewsStay current with emerging frontend technologies and advocate for their adoption when appropriateWork as a team to ensure everyone meets their goalsSkills You'll Need to Have:3-5+ years of professional experience in frontend web developmentStrong proficiency in HTML5, CSS3/SCSS , and modern CSS frameworks (e.g., Tailwind CSS, Styled Components, CSS Modules)Hands-on experience working with Figma and collaborating with designers to implement UI/UX designsDemonstrated ability to prototype and build UI components independently from design systems or minimal design directionExperience building and maintaining component libraries and design systemsExperience with state management solutions (Redux, Zustand, React Context, or similar)Proficiency in modern frontend build tools and bundlers (Webpack, Vite, etc.)Experience with testing frameworks such as Jest, React Testing Library, Cypress, or PlaywrightFamiliarity with RESTful APIs and integrating frontend applications with backend servicesExperience with Git version control and collaborative development workflowsUnderstanding of web accessibility standards (WCAG) and best practicesExperience owning a project from concept to production, including proposal, discussion, and executionSelf-motivated and self-managing, with strong organizational skillsComprehensive medical insurance coverageEmployee Referral Bonus ProgramWellness programsAn opportunity to do something great for yourself and the world!#J-*****-Ljbffr ## Related Videos - [But, you're not Facebook](https://www.wearedevelopers.com/videos/378-but-you-re-not-facebook) - [The Resilience of the World Wide Web](https://www.wearedevelopers.com/videos/1281-the-resilience-of-the-world-wide-web) - [Boost Productivity with AI: Figma & Playwright MCP Workflows - Aris Markogiannakis](https://www.wearedevelopers.com/videos/1768-boost-productivity-with-ai-figma-playwright-mcp-workflows-aris-markogiannakis) - [How a Small Team Shrank a Microsoft Monorepo by 94%](https://www.wearedevelopers.com/videos/1236-how-a-small-team-shrank-a-microsoft-monorepo-by-94) - [WeAreDevelopers LIVE – Frontend Inspirations, Web Standards and more](https://www.wearedevelopers.com/videos/1761-wearedevelopers-live-frontend-inspirations-web-standards-and-more) - [Can SVG be fast? 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