Senior JavaScript Engineer

Ciklum is looking for a Senior JavaScript Engineer to join our team full-time in Ukraine.

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, become a part of a cross-functional development team engineering experiences of tomorrow.

We are looking for a Senior JavaScript Engineer with strong design system or component library experience to help build, govern, and evolve a company-wide design system. The ideal candidate should have deep front-end engineering expertise, strong accessibility and performance knowledge, and the ability to work closely with Design, Product, Architecture, and Engineering teams.

This role is best suited to a senior engineer who can influence technical direction, promote engineering standards, and work confidently across multiple teams. You will join a highly motivated team and will be working on a modern solution for our existing client. We are looking for technology experts who want to make an impact on new business by applying best practices and taking ownership.

Responsibilities:

• Delivery. Create and maintain modern interfaces according to unit standards
• Code Quality. Follow and improve code quality standards
• Analyze and Estimate. Perform technical assessment of UI mockups/wireframes to ensure the possibility of their implementation within reasonable time
• Software Design. Create and review software feature design documents and provide the solution
• Contribute to the technical direction, architecture, tooling, and governance of the design system
• Collaborate with Design, Product, Architecture, and Engineering to ensure components are reusable, accessible, performant, and aligned to standards
• Support developers, review implementation quality, manage releases and breaking changes, and maintain clear technical documentation
• Contribute ideas through your knowledge of evolving front-end technologies
• Be proactive in communication with team members and client
• Use industry best practices of development processes & tools, adopt and improve them
• Mentorship of junior colleagues
• Take responsibility for project delivery playing role of the most senior technical person (by stack) at the project
• Direct client communications
• Set up efficient development workflow throughout proactive collaboration with any project role (ProjectManager, BA, PO, UX, UI, Arch, BE, DevOps)
• Problem solving, Solution Presentation, Meeting and Visual Facilitation

Requirements:

• HTML - Understands the purpose and use of all HTML elements. Able to explain the importance of the correct HTML for subjects such as SEO and Accessibility
• CSS - Advanced/expert level skills. Understanding of CSS architecture best practice. Knowledge of all aspects of the language and up to date with the latest features
• JavaScript - Core understanding of the native language. Proficient in TypeScript. Knowledge of web components. Ability to assess third-party libraries or frameworks for their appropriateness and can explain the pros/cons of their use
• Practical use of advanced features in React
• Strong knowledge of Web Components, design systems, component libraries, and scalable front-end architecture
• Practical accessibility experience, including WCAG 2.2 AA, ARIA, keyboard navigation, focus management, and screen reader testing
• Strong understanding of web performance, Core Web Vitals, optimisation techniques, and resilient web design
• Experience with automated testing, release management, documentation, and engineering governance
• Experience in designing solutions for complex features and creating documentation
• Uses the established standards and algorithms for implementing the application
• Experience in refactoring existing applications according to new requirements
• Hands-on experience with testing approaches and tools
• Ability to adjust and maintain the code quality rules and metrics
• Experience in configuring CI/CD pipelines (TravisCi, GitLabCI, etc.)
• Collaborates with the DevOps team to set up the custom CI/CD pipeline

Desirable:

• Experience with Contentful or similar headless CMS platforms
• Familiarity with Jira, Confluence
• Internationalisation practices (i18n)
• Performance optimization techniques (critical CSS extraction, lazy loading etc.)

Personal skills:

• Works under general direction, accepts guidance and has work reviewed at agreed milestones
• Has working-level contact with customers and colleagues
• May supervise others or make decisions which impact the work assigned to individuals or phases of projects
• Performs a range of work, sometimes complex and non-routine
• Demonstrates effective communication skills
• Plans, schedules and monitors own work (and that of others where applicable) competently
• Contributes fully to the work of teams

What’s in it for you?

• Strong community: Work alongside top professionals in a friendly, open-door environment
• Growth focus: Take on large-scale projects with a global impact and expand your expertise
• Tailored learning: Boost your skills with internal events (meetups, conferences, workshops), Udemy access, language courses, and company-paid certifications
• Endless opportunities: Explore diverse domains through internal mobility, finding the best fit to gain hands-on experience with cutting-edge technologies
• Flexibility: Enjoy radical flexibility – work remotely or from an office, your choice
• Care: We’ve got you covered with company-paid medical insurance, mental health support, and financial & legal consultations

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 one of Ukraine’s largest IT companies and a top employer recognized by Forbes, we’ve spent over 20 years delivering meaningful tech solutions. We proudly support diverse talent and military veterans, recognizing their unique skills and perspectives they bring to shaping the future.

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.

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