Sr. Java​/React FSE

About the Role

As a Senior Full Stack Engineer, you will provide technical leadership across the full software development lifecycle, driving architectural decisions, establishing engineering best practices, and ensuring the successful delivery of production-grade applications leveraging React, Java Spring Boot, GraphQL/REST APIs, AWS services, and modern event-driven architectures.

• Lead the end-to-end delivery of full stack applications using React, Java Spring Boot, GraphQL/REST APIs, AWS services, and event-driven technologies.
• Define and review application architecture, API contracts, service boundaries, data models, and integration patterns.
• Develop secure, high-quality, maintainable code while promoting engineering excellence through code reviews and technical mentorship.
• Design and support highly available, scalable, and performant systems with strong operational and reliability standards.
• Implement secure authentication and authorization solutions using OAuth2, OIDC, JWTs, and service-to-service security patterns.
• Establish observability practices including logging, monitoring, tracing, alerting, and operational runbooks.
• Collaborate closely with Product, UX, and business stakeholders to translate requirements into technical solutions and delivery plans.
• Evaluate internal and third-party technology solutions and provide recommendations based on scalability, security, maintainability, and business fit.
• Drive continuous improvement initiatives focused on automation, testing, deployment practices, and operational excellence.
• Promote adoption of modern engineering practices, including AI-assisted development tools and cloud-native technologies.

Work model: Hybrid. We believe remote work is the way forward as we strive to provide flexibility wherever possible. Based on this role’s business requirements, this is a remote position requiring 3 days a week in a client or Cognizant.

Location:

Jersey City, NJ.

Please note: A few of our roles may require in-person interviews at Cognizant offices or client locations, depending on project or client needs. The working arrangements for this role are accurate as of the date of posting. This may change based on the project you’re engaged in, as well as business and client requirements. Rest assured; we will always be clear about role expectations.

• Bachelor’s degree in computer science, Engineering, Information Technology, or a related field, or equivalent work experience.
• 8+ years of experience designing, building, and supporting enterprise-scale software applications.
• Proven experience providing technical leadership, owning solution design, and guiding engineering teams.
• Strong expertise in React, including Type Script, component architecture, state management, responsive design, and performance optimization.
• Deep experience developing applications using Java and Spring Boot frameworks.
• Hands‑on experience designing and implementing GraphQL APIs, including schema design, performance optimization, and governance practices.
• Strong understanding of REST API design standards, versioning, backward compatibility, and API lifecycle management.
• Experience implementing authentication and authorization solutions using OAuth2, OpenID Connect (OIDC), JWTs, scopes, and claims‑based security.
• Hands‑on experience building and operating cloud‑native solutions within AWS environments.
• Strong knowledge of AWS services, IAM, networking fundamentals, monitoring, logging, and operational tooling.
• Experience working with relational databases, including PostgreSQL/AWS Aurora PostgreSQL, covering query optimization, indexing, data modelling, and migration strategies.
• Experience working with graph databases such as AWS Neptune, including graph modelling and query optimization.
• Strong understanding of event‑driven architectures and messaging platforms such as AWS Managed Streaming for Apache Kafka (MSK).
• Experience implementing CI/CD pipelines, automated testing frameworks, code quality controls, and modern release practices.
• Demonstrated proficiency using AI‑assisted engineering tools such as Git Hub Copilot and/or Claude Code to enhance…