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.

Responsibilities

• Collaborate with designers and developers to build responsive and user-friendly interfaces
• Implement and maintain UI components using React
• Write clean, efficient, and testable code under the guidance of more experienced colleagues
• Troubleshoot and debug issues in web applications
• Contribute to improving the usability and performance of our products
• Front-end development to meet customer’s business needs and implement components according to modern software development environment with acceptable quality and supervision
• Taking part in the decision-making process in design application architecture, solution development, architecture and code review
• Describing own code within technical documents and simple diagrams and provide inputs/update to specifications for the solution
• Writing automated tests
• Proactive position in solution development, processes improvements
• Working in an international distributed team in an Agile environment
• Following best practices and defined standards for implementing the web application
• Investigate and fix application bugs

Requirements

• Experience in software development for more than 4-5 years
• Translate business needs into technical solutions and make decisions when building software (business-oriented)
• Proficiency in JavaScript/TypeScript, including basic knowledge of asynchronous programming
• Experience with modern JavaScript frameworks/libraries such as React
• Understanding of server-side technologies
• Familiarity with CSS preprocessors (like SASS or LESS.) or modern styling techniques (e.g., StyledComponents)
• Understanding of responsive design and frameworks like Bootstrap or Foundation
• Proficiency in Git and workflows (e.g., GitFlow)
• Ability to handle asynchronous operations
• Knowledge of front-end testing frameworks such as Jest, Mocha, or Jasmine
• Understanding of best practices for optimizing front-end performance
• Familiarity with tools for monitoring and improving performance
• Experience working in an Agile environment
• Excellent communication skills and a willingness to learn

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.