React Js jobs in United Kingdom

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As an experienced member of our Software Engineering Group, we seek individuals passionate about solving business challenges through innovation and modern engineering practices. You will leverage your deep expertise across the software development lifecycle while collaborating closely with stakeholders to achieve shared goals. We foster a culture of experimentation, continuous improvement, and learning within a collaborative and trusting environment.

• Design, develop, and maintain scalable microservices using Java 17+ and Spring Boot.
• Collaborate with cross-functional teams to deliver high-quality software solutions.
• Participate in architecture discussions and ensure adherence to best practices.
• Contribute to cloud-native development initiatives on AWS.
• Support migration of mainframe functionality to modern microservices architecture.
• Develop new microservices for greenfield projects while maintaining existing systems.
• Ensure code quality through testing and adherence to development standards.

• Proficiency in Java 17+ and Spring technology stack.
• Strong understanding of microservice design patterns.
• Advanced knowledge of application, data, and infrastructure architecture disciplines.
• Proficient in SQL and database modeling.
• Experience with messaging technologies such as Kafka or RabbitMQ.
• Exposure to React JS, Redux, HTML5, CSS3 (approx. 25% frontend involvement).
• Familiarity with frontend testing tools like Jest.
• Working proficiency with development toolsets and CI/CD pipelines.
• Knowledge of industry-wide technology trends and best practices.
• Ability to work effectively in large, collaborative teams.
• Exposure to cloud-native development on AWS.
• Domain knowledge of Investment Banking / Asset & Wealth Management (preferred).

• Java 17+
• Spring Boot
• Microservices
• Kafka
• AWS
• SQL

• Kubernetes
• React JS
• Cloud Platform: AWS
• Frontend involvement: Approximately 25% (React JS and testing tools like Jest).

Project Context: Combination of greenfield development and migration from mainframe to microservices.

• Cognizant is a global community with more than 300,000 associates around the world.
• We don't just dream of a better way - we make it happen.
• We take care of our people, clients, company, communities and climate by doing what's right.
• We foster an innovative environment where you can build the career path that's right for you.

Cognizant is one of the world's leading professional services companies, transforming clients' business, operating, and technology models for the digital era. Our unique industry-based, consultative approach helps clients envision, build, and run more innovative and efficient businesses. Headquartered in the U.S., Cognizant (a member of the NASDAQ-100 and one of Forbes World's Best Employers 2025) is consistently listed among the most admired companies in the world. Learn how Cognizant helps clients lead with digital at www.cognizant.com

Cognizant is an equal opportunity employer. Your application and candidacy will not be considered based on race, color, sex, religion, creed, sexual orientation, gender identity, national origin, disability, genetic information, pregnancy, veteran status or any other characteristic protected by federal, state or local laws.

Disclaimer: Compensation information is accurate as of the date of this posting. Cognizant reserves the right to modify this information at any time, subject to applicable law.

Applicants may be required to attend interviews in person or by video conference. In addition, candidates may be required to present their current state or government issued ID during each interview.