• Collaborate with designers and developers in reviews to provide early feedback on usability, layout, and interaction design. • Conduct thorough manual and automated UI/UX testing of Ruby on Rails applications across desktop and mobile, ensuring responsive design, intuitive flows, and pixel-perfect rendering. • Perform exploratory, regression, and cross-browser testing to validate dynamic interfaces, real-time updates, and user interactions under varied conditions. • Identify and document findings with clear reproduction steps, screenshots, console logs, and session recordings for efficient developer resolution. • Execute performance-focused UX testing, verifying smooth data loading, error handling, and feedback during slow or failed backend responses. • Continuously improve test coverage, tools, and processes to support rapid Rails feature delivery with high quality.