Mid-Level Java Developer

We are seeking a skilled Java developer with 3+ years’ experience for our Neftex Technical Services Team. Reporting to the Team Lead, you will contribute to the design, development, and maintenance of subsurface evaluation solutions across the energy sector. Successful candidates will be evidently enthusiastic and motivated people who we can train up in our processes and ultimately play a key role in quality assurance initiatives across different stakeholder groups.

Please note, although this is a hybrid position, you will be required to attend our Abingdon, Oxfordshire office a minimum of three days per week.

• Strong knowledge of Java Core, including:
• Collections Framework, Generics, Streams, Lambdas
• Exception handling and best practices
• Multithreading and concurrency (Executors, synchronization, Completable Future)
• Memory management and garbage collection basics
• Experience with Java and related frameworks (Spring Boot, Eclipse RCP, OData, Hibernate, JPA, REST, etc.)
• Backend development including REST APIs with Spring Boot, Swagger/OpenAPI specifications, Spring Security, OAuth2/OIDC, JWT.
• Git-based workflows and Gitlab CI/CD pipelines.
• Experience working in an Agile development environment (Scrum or Kanban).
• Familiarity with SQL Server, PostgreSQL or other relational databases.
• Self-starter with a proactive attitude and ability to learn new technologies quickly.
• Undergraduate degree in Software Engineering, Computer Science, or a related field.

• Familiarity with GIS connectors.
• Familiarity with Azure Dev Ops, Git Lab, and Git-based workflows.
• Experience with CI/CD pipeline automation and deployment scripting.
• Experience with automated testing, including unit, integration, and regression testing.
• Knowledge of containerization and orchestration (Docker, Kubernetes).

• Design, develop, and maintain desktop and web applications using Java.
• Implement new services, features, and bug fixes as prioritized by the Product Owner.
• Build and integrate APIs to enable seamless communication between services and components.
• Collaborate with product owners, architects, and other developers to define requirements and deliver high-quality solutions.
• Participate actively in Agile ceremonies including sprint planning, daily stand-ups, backlog refinement, and retrospectives.
• Write clean, maintainable, and well-documented code following industry best practices and internal standards.
• Implement automated tests (unit, integration, and functional) to ensure code quality and reliability.
• Monitor and optimize performance, scalability, and security.
• Apply and enforce security best practices, including:
• Ensuring secure authentication and authorization flows.
• Implementing encryption for data in transit and at rest.
• Validating and sanitizing all inputs to prevent injection attacks.
• Keeping dependencies and libraries up to date to mitigate vulnerabilities.
• Troubleshoot and resolve issues across development, staging, and production environments.
• Maintain up-to-date knowledge of emerging technologies, frameworks, and industry trends relevant to day-to-day development.
• Contribute to technical documentation and knowledge sharing across teams.
• Communicate and elevate issues clearly and promptly to relevant stakeholders

We are seeking a skilled Java developer with 3+ years’ experience for our Neftex Technical Services Team. Reporting to the Team Lead, you will contribute to the design, development, and maintenance of subsurface evaluation solutions across the energy sector. Successful candidates will be evidently enthusiastic and motivated people who we can train up in our processes and ultimately play a key role in quality assurance initiatives across different…