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We’re looking for a Senior React Developer to join our dynamic team at Sigma Software! We brought many AdTech startups from an idea to a thriving business. We’ve been working with advertising technology businesses since 2008, helping them envision, build, and support their technology. If you’re passionate about React and eager to shape the future of AdTech, we’d love to hear from you! Our client is a leading provider of contextual advertising solutions, specializing in analyzing website content to deliver highly relevant ads tailored to users’ interests. Their technology ensures seamless ad integration, maintaining an uninterrupted and engaging user experience. Serving both publishers and brands, they enable effective content monetization while preserving content quality and audience engagement. Design and implement modern Front-end architecture, focusing on scalability, maintainability, and performance Introduce and enforce Front-end best practices, including atomic design and performance optimization Participate in code reviews, ensuring high-quality code and adherence to established standards 4+ years of experience in Front-end development with ReactJS ~ Deep understanding of React ecosystem (components, state management, hooks, and rendering)~ Strong knowledge of modern web technologies and responsive design (HTML5, CSS3)~ Knowledge of testing tools like Jest, React Testing Library, Enzyme, or others ~ An Upper-Intermediate level of English Strong communication and teamwork skills, with experience of collaborating in a remote or distributed team environment in English