Senior Full-Stack Engineer (React, TypeScript, Node.js)

We are looking for a talented **Senior Full\-Stack Engineer** **with experience in TypeScript, Node.js, and React** to help us improve platform stability and reduce technical debt. As we've quickly evolved our product with key features like versioning and localization, we're now focusing on stabilizing our foundation to support future growth. You'll work with our engineering team to implement improvements that enhance reliability, expand test coverage, and help us build a more resilient platform that supports our ambitious roadmap.   **Responsibilities** * Expand end\-to\-end test coverage to improve platform stability * Fix bugs and security vulnerabilities identified by our bug bounty program * Refactor frontend components and services to reduce technical debt and improve maintainability * Build and improve frontend observability tools to help identify and diagnose issues * Implement UI performance optimizations to enhance user experience * Contribute to a major authorization refactor project for a GraphQL API * Assist with instrumentation improvements for better frontend monitoring * Help document best practices and contribute to technical specifications   **Requirements** * 3\+ years of experience as a Full\-Stack Engineer * Proficiency in TypeScript with production experience in React and Node.js * Solid understanding of testing frameworks (e.g., Jest, Vitest, Playwright) * Strong understanding of REST and GraphQL APIs, with familiarity with both the server and client sides * Experience with frontend performance optimization * Comfortable working with CI/CD methodologies (e.g., GitHub Actions) * Excellent problem\-solving and critical\-thinking skills, with the ability to self\-manage, plan, and adapt to changing requirements in a fast\-paced environment * Exceptional written and verbal communication skills, with a strong ability to collaborate * Fluency in English (both written and spoken) at a minimum B2 level   **Nice to have** * Experience with cloud platforms, particularly GCP * Skills in Next.js * Familiarity with NestJS * Background in visual editing or design tools * Experience with eCommerce platforms   **We offer** * International projects with top brands * Work with global teams of highly skilled, diverse peers * Healthcare benefits * Employee financial programs * Paid time off and sick leave * Upskilling, reskilling and certification courses * Unlimited access to the LinkedIn Learning library and 22,000\+ courses * Global career opportunities * Volunteer and community involvement opportunities * EPAM Employee Groups * Award\-winning culture recognized by Glassdoor, Newsweek and LinkedIn