Senior JavaScript Engineer

Ciklum is looking for a Senior JavaScript Engineer to join our team in Argentina. We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live. About the role: As a Senior JavaScript Engineer, you will work within a distributed team across LATAM and US time zones to engineer highly accessible, performance-driven web interfaces, as well as help build, govern, and scale an enterprise-wide design system. Responsibilities: Build & Maintain UI Libraries: Engineer, govern, and evolve a unified enterprise design system powering digital code platforms, learning management systems, mobile/hybrid interfaces, and compliance portals Technical Ownership: Drive front-end strategy, component architecture, tooling, and governance to ensure consistency across multiple public and internal web applications Accessibility & Performance: Enforce strict adherence to WCAG 2.2 AA standards, semantic HTML, ARIA patterns, keyboard navigation, and Core Web Vitals optimization Stakeholder Sync & Design Alignment: Collaborate in real-time with US-based Product Managers, UX Designers, and Architects to translate complex workflows into reusable UI components Governance & Tooling: Manage semantic versioning of UI packages, write technical documentation, handle breaking changes, and automate UI testing pipelines Mentorship & Excellence: Mentor mid-level engineers on modern JavaScript/TypeScript patterns, testing methodologies, and web component design Requirements: We know that sometimes, you can’t tick every box. We would still love to hear from you if you think you’re a good fit! Software Design: Experience in designing solution architectures for enterprise design systems, design tokens, and web component design Uses established standards and algorithms for translating complex technical workflows into UI components and maintaining semantic versioning Software development: Proficient in native JavaScript, TypeScript, semantic HTML5, and CSS3 (CSS Modules, Styled Components, Tailwind CSS, Sass) Practical use of advanced features in React (Hooks, Context, State Management, SSR/Next.js) and Web Components Experience in refactoring existing applications according to accessibility (WCAG 2.2 AA) and performance requirements Bonus: Experience building cross-platform web/mobile components using Ionic Framework Quality Assurance: Hands-on experience with testing approaches and tools (Storybook, Jest, React Testing Library, Cypress, visual regression tools) Ability to adjust and maintain code quality rules, accessibility testing (NVDA/JAWS/VoiceOver), and Core Web Vitals metrics Software Deployment: Experience in configuring CI/CD pipelines (GitHub Actions, GitLab CI) and build tools (Vite/Webpack) Collaborates with the DevOps team to set up continuous delivery workflows What’s in it for you? Care: your mental and physical health is our priority. We ensure comprehensive company-paid medical insurance and mental health programs, 5 undocumented sick-leave days per year Tailored education path: boost your skills and knowledge with our regular internal events (meetups, conferences, workshops), Udemy license, language courses and company-paid certifications Growth environment: share your experience and level up your expertise with a community of skilled professionals, locally and globally Long-term employment with 20 working-days paid vacation and local bank holidays Flexibility: 100% remote work mode Opportunities: we value our specialists and always find the best options for them. Our Internal Mobility Program helps change a project if needed to help you grow, excel professionally and fulfill your potential Global impact: work on large-scale projects that redefine industries with international and fast-growing clients Welcoming environment: feel empowered with a friendly team, open-door policy, informal atmosphere within the company and regular team-building events About us: At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you’ll work with cutting-edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress. As we expand into Latin America, every Ciklumer is helping to shape our story. Collaborate with seasoned experts and make a global impact backed by two decades of industry leadership. Explore, empower, engineer with Ciklum! Interested already? We would love to get to know you! Submit your application. We can’t wait to see you at Ciklum. #LI-VH1