Senior Frontend Engineer (100% remote)💰 Salary: Up to 110PLN/h🌎 100% remote🕦 Full-time or Part-time, 4–5 months (high chances of extension)☑️ B2B ContractWe are looking for a Senior Frontend Engineer to join the team. You will be responsible for rebuilding the frontend from scratch, with performance optimization as the primary goal. The team is looking for someone who can work independently, take ownership of technical decisions, and contribute actively to the overall product direction.Requirements:5+ years of overall professional experience as a frontend engineerStrong proficiency in JavaScript, with experience building scalable, high-performance applications5+ years of experience with React, including modern component-based architecture and performance optimization2+ years of experience working with Lightning.js, preferably on TV or set-top box platformsBackground in TV- or video-related products, such as streaming platforms, media players, or broadcast applications is a huge plusAbility to work closely with product, design, and backend teams to deliver user-focused solutionsExperience optimizing performance and ensuring smooth playback and UI responsiveness on constrained devicesAbility to communicate effectively in EnglishKey Responsibilities:Contribute to redevelopment of the application from the ground up, owning architecture and core technical decisionsDesign and implement a high-performance frontend with a strong focus on optimization, efficiency, and scalabilityIdentify and resolve performance bottlenecks, ensuring smooth and responsive user experiences across devicesTranslate product requirements into clean, maintainable, and well-structured codeEnsure code quality through testing, reviews, and performance monitoring throughout the rewrite processGet to know DevsData:We are a technology consulting company and a recruitment agency, delivering software solutions to clients from Europe and the US. We work 100% remotely, in an international team, including people from Asia, London, or San Francisco. We employ people with experience in international corporations as well as students of the best technical and business universities.Find out more: https://devsdata.com/