Senior Full Stack Developer (Node.js + React)

Senior Full Stack Developer (Node.js + React)

• Salary: 23,000-24,800 PLN/Month
• Warsaw, Poland (Hybrid - 3 days in office, 2 days remote)
• Full-time
• B2B or CoE

We’re looking for a Senior Full-Stack Developer to join a fast-growing international tech company focused on building modern, data-driven platforms that power digital transformation in the financial and enterprise sectors.

Requirements:

• 5+ years of experience as a Senior Full Stack Developer with significant expertise in Node.js and React.
• Strong experience in building server-side applications using Node.js and Express.js.
• Hands-on experience with API development and integration, particularly with GraphQL or RESTful services.
• Strong knowledge of authentication and authorization mechanisms (OAuth, JWT, session-based).
• Front-end proficiency in React.js, Redux, HTML5, CSS3, and modern JavaScript (ES6+).
• Familiarity with front-end build tools such as Vite, Webpack, and Babel.
• Strong experience with databases such as MySQL and  PostgreSQL.
• Experience with cloud platforms (AWS, Azure, or GCP), as well as containerization and orchestration tools such as Docker and Kubernetes.
• Strong experience using Git and version control systems.
• Proficiency in English (both written and spoken).

Key Responsibilities:

• Design, build, and maintain scalable, high-performance server-side applications and RESTful APIs using Node.js and Express.js.
• Develop and maintain interactive, responsive user interfaces using React.js, Redux, and modern JavaScript (ES6+).
• Lead the design and implementation of scalable architectures and microservices.
• Work closely with database engineers to design efficient schemas and manage data interactions using SQL databases or MongoDB.
• Ensure reliable deployments and smooth release of updates using CI/CD pipelines and Docker.
• Write unit and integration tests and optimize performance to ensure high-quality code.
• Collaborate closely with cross-functional teams to define and implement technical solutions.
• Improve system performance, reliability, and long-term maintainability through optimization and best practices.