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Java Full Stack Developer

Job in Greater London, London, Greater London, W1B, England, UK
Listing for: Cognizant
Full Time position
Listed on 2026-07-23
Job specializations:
  • Software Development
    Full Stack Developer, Backend Developer, Cloud Engineer - Software, Java Developer
Salary/Wage Range or Industry Benchmark: 80000 - 100000 GBP Yearly GBP 80000.00 100000.00 YEAR
Job Description & How to Apply Below
Location: Greater London

We are seeking an experienced Java Full Stack Developer with a strong background in building scalable, high-performance applications using modern frontend and backend technologies. This role is ideal for someone who thrives in a hands-on, collaborative environment and is comfortable working onsite with cross-functional teams.

You will be responsible for designing, developing, and deploying enterprise-grade applications using ReactJS, Spring Boot, Microservices, and a wide range of cloud and Dev Ops tools.

Key Responsibilities
  • Design, develop, and maintain full-stack applications using ReactJS on the frontend and Spring Boot on the backend.
  • Build and consume RESTful APIs and ensure seamless integration across services.
  • Implement secure authentication and authorization using OAuth
    2.
  • Develop microservices-based solutions with strong emphasis on scalability and performance.
  • Work with SQL databases and JPA/Hibernate for data persistence.
  • Integrate and manage event-driven components using Kafka.
  • Deploy and manage applications on AWS (S3, EC2, ECS or EKS).
  • Containerize and orchestrate services using Docker and Kubernetes.
  • Implement CI/CD pipelines using tools like Git and Jenkins.
  • Collaborate closely with product owners, architects, and QA teams to deliver high-quality software.
  • Troubleshoot production issues and optimize application performance.
Required Skills & Experience Frontend
  • Strong proficiency in ReactJS, including hooks, state management, and component architecture.
  • Good hands-on experience with Java and Spring Boot.
  • Expertise in REST API development.
  • Strong understanding of JPA/Hibernate and relational databases (MySQL, PostgreSQL, or similar).
  • Experience with OAuth2 and secure API design.
  • Solid understanding of Microservices Architecture.
Messaging & Cloud
  • Experience with Kafka for event-driven systems.
  • Hands-on experience with AWS services such as S3, EC2, ECS or EKS.
Dev Ops & Deployment
  • Proficiency with Docker and Kubernetes.
  • Experience building CI/CD pipelines using Git, Jenkins, or similar tools.
Nice-to-Have
  • Experience with monitoring tools (Prometheus, Grafana, ELK).
  • Familiarity with serverless components on AWS.
  • Knowledge of test automation frameworks (JUnit, Mockito, Cypress, etc.).
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