Senior Full Stack Developer (React and C#)

We are looking for a **Senior Full Stack Developer (React and C\#)** to help build, modernize, and sustain business\-critical applications with current best practices. You will write and refactor ReactJS and C\#/.NET code, support migrations from monoliths to microservices, and strengthen CI/CD with GitHub Actions to keep delivery smooth and reliable—apply now.   **Responsibilities** * Develop, review, and optimize React and C\# code to deliver new features and support modernization work * Refactor legacy components to improve performance, readability, and long\-term maintainability * Coordinate migration approaches to modern platforms or updated architectures * Validate data integrity and ensure smooth cutovers throughout system migrations * Apply modern design patterns, frameworks, and engineering best practices * Create clear technical documentation covering migration steps and modernization decisions * Communicate with stakeholders by sharing status, risks, and blockers * Promote component reusability, modularity, and performance optimization across the codebase * Deliver iterative stories using trunk\-based development practices * Collaborate in pairing sessions, shared quality assurance, and test\-driven development (TDD) * Enable automated deployments, fast builds, and production\-ready code with built\-in observability, resilience, and security **Requirements** * Proven track record of 3\+ years of professional experience in software engineering with a strong back\-end focus * Hands\-on proficiency with ReactJS, C\#, and .NET in production environments * Solid background in CI/CD environments such as GitHub Actions, including deployment pipelines and version control workflows * Practical experience building modern applications using loosely coupled services * Demonstrated experience contributing to modernization efforts, including migrating from monoliths to microservices   **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