Senior React Developer w Warszawa, Polska

SNI is serving as a trusted IT Outsourcing partner in line with the needs of World's most prestigious firms and carried out successful projects worldwide. Responsibilities: Partner with product and design to shape solutions, validate assumptions, and deliver user-facing features. Architect, build, and maintain large-scale React and JavaScript applications, including established codebases. Diagnose and resolve complex dependency, build, integration, and cross-browser runtime issues. Drive automated testing (unit, integration, UI) and maintain CI/CD pipelines through production releases. Optimize app performance, handle production monitoring, and contribute to technical design and estimation. Skills: Extensive experience building scalable web applications using React and core JavaScript. React architecture, state management, component design, WebViews, caching, and modern web standards. CI/CD pipelines, automated testing frameworks, and collaborative Git workflows. Product-minded approach with experience working directly with cross-functional design and product teams. Strong communication skills suited for remote-first environments. Nice to Have WebViews embedded within native iOS/Android applications. Web accessibility standards (WCAG), PWAs, and offline caching patterns. GitHub Actions, AWS CodeBuild, performance optimization and continuous delivery. Follow us on Linkedin!