Senior React JS Developer - Remote

• Please note, this role is not able to offer visa transfer or sponsorship now or in the future*

About Us 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, is ranked 195 on the Fortune 500 and is consistently listed among the most admired companies in the world. Learn how Cognizant helps clients lead with digital at www.cognizant.com.

About Cognizant’s IoT Practice Intelligent, IoT-enabled products will soon result in the proliferation of data and disrupt virtually all industries. To be successful, both large and small companies must leverage IoT capabilities by designing modern products that fundamentally connect people with processes. Within Cognizant IOT, we engineer industry-aligned, IoT-enabled products that merge industry needs with human drivers. Our intelligent products will revolutionize experiences and result in exciting, transformative outcomes. Without human-centered thinking, connected products are just standalone things—but with it, our modern connected products facilitate a unified way of life enjoyed by all.

Role Summary We are looking for an experienced Senior React JS Developer / Front-End Lead to lead the end-to-end design and development of complex React applications supporting investment products and operational workflows for global banking clients.

The role requires strong hands-on expertise in React JS, JavaScript, front-end architecture, performance optimization, API integration, testing, and secure development practices. Experience within Investment Banking, Brokerage, Trading, or Settlement operations is highly preferred.

Key Responsibilities

• Lead end-to-end design and development of complex React JS applications supporting investment products and banking operational workflows.
• Develop highly responsive, scalable, and accessible user interfaces using JavaScript, React JS, HTML, and CSS.
• Optimize application performance by identifying bottlenecks, improving React component structures, and refining state-management approaches.
• Work closely with Product Owners, Business Analysts, and Investment Banking Operations teams to translate business requirements into technical designs and implementation plans.
• Provide technical guidance to developers on JavaScript coding standards, React architectural patterns, reusable components, and secure development practices.
• Integrate front-end applications with backend services and APIs by defining data contracts, managing error scenarios, and ensuring reliable communication.
• Conduct code reviews and maintain strong unit-testing coverage to minimize regressions and improve long-term maintainability.
• Collaborate with Quality Engineering teams to build testable components, support automated user journeys, and resolve issues identified during system and user acceptance testing.
• Promote continuous improvement through reusable components, streamlined development workflows, and adoption of modern React and JavaScript tooling.
• Support production applications by analyzing incidents, performing root-cause analysis, implementing fixes, and improving application monitoring.
• Engage with business and technical stakeholders to present technical options, explain trade-offs, and align solutions with organizational objectives.
• Create and maintain technical documentation including solution designs, component libraries, configurations, and onboarding documentation.
• Participate in sprint planning, estimation, and technical risk assessment to develop realistic implementation plans and timelines.
• Mentor and guide peers on robust front-end development practices without requiring formal people-management responsibilities.

Required Qualifications

• Extensive hands-on experience with JavaScript and React JS in enterprise-scale applications.

• Strong knowledge of:

• React component-based architecture
• State-management concepts and frameworks
• JavaScript / modern ES standards
• HTML and CSS
• Asynchronous programming

• REST APIs and backend-service integration

• Strong understanding of front-end performance optimization and troubleshooting.
• Experience with version control systems, build tools, package mana…