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 2008 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 Threat DownThreat Down, 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 Threat Down, 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/Threat Down 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+ yearsof professional experience in frontend web developmentStrong proficiency inHTML5, CSS3/SCSS, and modern CSS frameworks (e.G., Tailwind CSS, Styled Components, CSS Modules)Hands-on experience working withFigmaand collaborating with designers to implement UI/UX designsDemonstrated ability toprototype and build UI components independentlyfrom design systems or minimal design directionExperience building and maintainingcomponent librariesanddesign systemsExperience withstate managementsolutions (Redux, Zustand, React Context, or similar)Proficiency in modern frontend build tools and bundlers (Webpack, Vite, etc.)Experience withtesting frameworkssuch as Jest, React Testing Library, Cypress, or PlaywrightFamiliarity withRESTful APIsand integrating frontend applications with backend servicesExperience withGitversion control and collaborative development workflowsUnderstanding ofweb 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!

📌 Senior Frontend Web Application Developer (Bilbao)
🏢 Malwarebytes
📍 Bilbao