Senior Frontend Engineer at Healthy Living

Madrid, Community of Madrid, Spain -

Full Time

Start Date

Immediate

Expiry Date

22 Mar, 26

Salary

0.0

Posted On

22 Dec, 25

Experience

5 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

JavaScript, UI/UX, Frontend Development, REST APIs, Component Libraries, Design Systems, Accessibility Standards, Responsive Design, Node.js, Debugging, Code Quality, Performance Optimization, Collaboration, Documentation, User Experience, Data-Driven Applications

Industry

Defense and Space Manufacturing

Description

Blackwall is an AI-enabled security and web infrastructure company dedicated to safeguarding web ecosystems from automated threats. Deployed across 2.3M+ websites and applications, GateKeeper, the company’s flagship product, is trusted by 100+ service & hosting partners globally to enhance performance, reduce operational costs, and maximize revenue by protecting SMB customers worldwide against emerging threats with simplicity, affordability, and scalability. We’re looking for an experienced Frontend Engineer to drive the development of Blackwall’s user interfaces and client-side architecture. This role focuses on building high-quality JavaScript-based frontends for complex, data-driven products, translating design concepts into polished, production-ready experiences. You’ll work closely with design, product, and backend engineering to deliver reliable, performant, and maintainable user interfaces. The role combines strong frontend craftsmanship with a sense of ownership over UI quality, usability, and long-term maintainability, ensuring frontend solutions align with product goals and real user needs at Blackwall. What You’ll Do Frontend Development & UI/UX Implementation Translate Figma designs, mockups, and UX concepts into high-quality JavaScript-based frontends. Ensure consistent styling, spacing, responsiveness, and alignment with the design system. Build and maintain reusable UI components, forms, and interactive elements. Deliver polished, user-friendly interfaces for complex, data-heavy applications. Product & Engineering Collaboration Collaborate closely with designers to refine user flows and usability. Integrate frontend components with backend APIs and services. Participate in architectural discussions and contribute to improvements of the frontend layer. Quality & Performance Implement client-side validation, error handling, and smooth user interactions. Optimize frontend performance, especially for complex dashboards and workflows. Maintain high standards for code quality, readability, scalability, and maintainability. Maintenance & Ownership Debug, improve, and refactor existing UI features. Take ownership of frontend features from implementation to long-term stability. Contribute to documentation, UI guidelines, and frontend best practices. What We’re Looking For Must-have Strong experience with modern JavaScript frontend development. Solid understanding of UI/UX principles and the ability to translate designs into production-ready interfaces. Experience building dashboards, forms, and business-critical application UIs. Proficiency in working with REST APIs and frontend application architectures. High attention to detail, clean code practices, and a strong sense of ownership over user experience. Nice-to-have Experience with Node.js on the server or backend side. Familiarity with full-stack workflows and frontend–backend integration patterns. Experience working with component libraries and design systems. Background in enterprise, internal tools, or B2B product development. Understanding of accessibility standards and responsive design best practices. Experience working with commercial or open source hosting control panels. Why Join Blackwall: Be part of a fast-growing cybersecurity company backed by leading European investors. Work fully remote with a distributed team across Europe, APAC, and the Americas. Collaborate with experts in cybersecurity, infrastructure, and AI-driven innovation. Contribute directly to how millions of websites stay protected and perform better every day. Join a team that values clarity, accountability, and human connection over hierarchy. We are committed to creating a diverse and inclusive environment and encourage all applicants to apply for our roles. We actively value and seek diverse talent! Learn more about us at:https://blackwall.com

Responsibilities

The Senior Frontend Engineer will drive the development of user interfaces and client-side architecture, focusing on building high-quality JavaScript-based frontends for complex, data-driven products. This role involves collaborating with design, product, and backend engineering teams to deliver reliable and maintainable user interfaces.