Company Description
We’re looking for a Senior React Developer to join our dynamic team at Sigma Software!
As part of Stellar, our dedicated AdTech business unit, you’ll collaborate with over 300 experts specializing in cutting-edge advertising technology solutions. Over the years, we’ve had the opportunity to work with some of the biggest AdTech companies in the world. 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!
CUSTOMER
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.
Job Description
- Collaborate with client teams to build the UI part for AI features
- Design and implement modern Front-end architecture, focusing on scalability, maintainability, and performance
- Develop robust, reusable, and modular components that align with best practices and industry standards
- Introduce and enforce Front-end best practices, including atomic design and performance optimization
- Analyze and estimate work in an agile environment
- Participate in code reviews, ensuring high-quality code and adherence to established standards
Qualifications
- 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)
- Experience working with RESTful APIs and GraphQL
- Knowledge of testing tools like Jest, React Testing Library, Enzyme, or others
- Proven ability to optimize web applications for performance
- An Upper-Intermediate level of English
Additional Information
PERSONAL PROFILE
- Strong communication and teamwork skills, with experience of collaborating in a remote or distributed team environment in English
- Excellent problem-solving skills and a proactive attitude toward identifying solutions
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What We Do
Sigma Software Group, an award-winning and trusted IT partner, has been serving customers for over 21 years, providing comprehensive IT solutions to various businesses, ranging from startups to established software product houses. As one of Europe's substantial IT consultancies, it brings together a dedicated workforce of over 2,100 professionals in 40 offices across 19 countries. With a diverse client base, including more than 300 enterprises, including Fortune 500 stalwarts, Sigma Software Group is a preferred choice for developing solutions that help businesses create cutting-edge products while meeting their unique needs.
Sigma Software Group operates as a dynamic ecosystem of tech companies, offering 25 ready-to-implement innovative products and 40+ value-added services. Furthermore, Sigma Software Group is committed to fostering innovation through initiatives such as the Sigma Software Labs business incubator, Sigma Software University, the SID Venture Partners VC Fund, UA Tech Network, Techosystem, the European Business Association, and other collaborative efforts.
Since 2015, Sigma Software Group has consistently earned recognition on the IAOP's prestigious World's Top 100 Outsourcing list. The company's accomplishments have also been acknowledged by prominent global media outlets such as Forbes, CNBC, The Times, and Reuters









