Senior Frontend React Developer

Our Customer:

Our client is a fast-growing cybersecurity technology company developing a large-scale platform for simulating cyberattacks and assessing security posture. The product includes complex web interfaces, high-load backend services, and cloud-native components.

Your Tasks:

• Design, develop, and maintain advanced frontend features using React and modern JavaScript (ES6+).
• Build complex UI components, interactive dashboards, and scalable, reusable component libraries (including Storybook).
• Own and evolve the frontend architecture, ensuring high performance, maintainability, and a consistent user experience across the platform.
• Optimize rendering behavior and application performance, minimizing unnecessary re-renders and improving perceived UI responsiveness.
• Collaborate closely with product managers, designers, and backend engineers to deliver high-quality features end to end.
• Participate in technical discussions, frontend architecture decisions, and code reviews.
• Integrate frontend applications with backend APIs (Node.js-based services).
• Work with Git-based workflows and CI/CD pipelines to ensure smooth delivery and deployment.
• Ensure clean, testable, and well-documented code following frontend best practices.

Required Experience & Skills:

• 5+ years of professional experience in frontend or web development.
• Senior-level expertise in React and the modern frontend ecosystem.
• Excellent command of JavaScript, with a deep understanding of how the language works (execution context, async behavior, data handling).
• Strong experience designing and maintaining reusable UI components and design systems (Storybook or similar).
• Solid understanding of frontend application architecture, state management strategies, and data flow patterns.
• Experience optimizing React applications for performance and scalability.
• Working knowledge of backend integration (REST APIs, Node.js services).
• Experience working with relational and/or NoSQL databases (e.g., PostgreSQL, MongoDB) at an integration level.
• Familiarity with CI/CD pipelines and modern development workflows.
• Strong focus on code quality, testing, and maintainability.
• English — Upper-Intermediate+ (written and spoken).

Working conditions

• 5-day working week, 8-hour working day;
• All UA public holidays are days off;
• Vacation and sick leave are covered by the company;
• Remote work.