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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Mid-Level Java Developer - **Company:** Halliburton - **Location:** Milton, UK - **Experience:** Experienced - **Contract:** Permanent contract - **Skills:** Java (Programming Language), Spring Security, Application Programming Interfaces (APIs), Agile Methodology, Automation of Tests, Microsoft Azure, Bioinformatics, Software Bug Management, Software Quality, Continuous Integration, Relational Databases, Software Design Patterns, Memory Management, Eclipse (Software), Hibernate (Java), Java Persistence API, PostgreSQL, Microsoft SQL Server, OAuth, Open Data Protocol, Object-Oriented Software Development, OpenID, Scrum Methodology, Regression Testing, Swagger, Software Engineering, Web Applications, Openapi, Multithreading, Spring-boot, AWS Lambda, Backend, Gitlab, Containerization, Gitlab-ci, Git Flow, Kubernetes, Information Technology, Osgi, Restful APIs, Docker, Microservices - **Published:** August 26, 2026 - **Apply:** https://www.collegerecruiter.com/job/2815167730-mid-level-java-developer ## About the Role * Strong knowledge of Java Core, including: * Collections Framework, Generics, Streams, Lambdas * Exception handling and best practices * Multithreading and concurrency (Executors, synchronization, CompletableFuture) * Memory management and garbage collection basics * Object-oriented principles (SOLID, design patterns, microservice architecture) * Experience with Java and related frameworks (SpringBoot, 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 DevOps, GitLab, and Git-based workflows. * Experience with CI/CD pipeline automation and deployment scripting. * Experience with automated testing, including unit, integration, and regression testing. * Eclipse Plugin development experience including SWT, JFace, Eclipse OSGi, extension points, views/editors, preferences * Knowledge of containerization and orchestration (Docker, Kubernetes). ## Description We are looking for 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. Minimum Qualifications * Strong knowledge of Java Core, including: * Collections Framework, Generics, Streams, Lambdas * Exception handling and best practices * Multithreading and concurrency (Executors, synchronization, CompletableFuture) * Memory management and garbage collection basics * Object-oriented principles (SOLID, design patterns, microservice architecture) * Experience with Java and related frameworks (SpringBoot, 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. Preferred Qualifications * Familiarity with GIS connectors. * Familiarity with Azure DevOps, GitLab, and Git-based workflows. * Experience with CI/CD pipeline automation and deployment scripting. * Experience with automated testing, including unit, integration, and regression testing. * Eclipse Plugin development experience including SWT, JFace, Eclipse OSGi, extension points, views/editors, preferences * Knowledge of containerization and orchestration (Docker, Kubernetes). Key Responsibilities * 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 upscale issues clearly and promptly to relevant stakeholders. Halliburton is an Equal Opportunity Employer. Employment decisions are made without regard to race, color, religion, disability, genetic information, pregnancy, citizenship, marital status, sex/gender, sexual preference/ orientation, gender identity, age, veteran status, national origin, or any other status protected by law or regulation. Location 97 Jubilee Avenue, Milton Park, Abingdon, Oxfordshire, OX14 4RW, United Kingdom Job Details Requisition Number: 209320 Experience Level: Experienced Hire Job Family: Engineering/Science/Technology Product Service Line: Landmark Software & Services Full Time / Part Time: Full Time Additional Locations for this position: Abingdon Compensation Information Compensation is competitive and commensurate with experience. ## Related Videos - [Remote Driving on Plant Grounds with State-of-the-Art Cloud Technologies](https://www.wearedevelopers.com/videos/251-remote-driving-on-plant-grounds-with-state-of-the-art-cloud-technologies) - [Docker Compose: Rediscovered](https://www.wearedevelopers.com/videos/1978-docker-compose-rediscovered) - [Keeping applications secure by evolving OAuth 2.0 and OpenID Connect](https://www.wearedevelopers.com/videos/100152-keeping-applications-secure-by-evolving-oauth-2-0-and-openid-connect) - [Navigating the Corporate Jungle: Life as a Developer in a large Company](https://www.wearedevelopers.com/videos/621-navigating-the-corporate-jungle-life-as-a-developer-in-a-large-company) - [Docker build without Docker](https://www.wearedevelopers.com/videos/100114-docker-build-without-docker) - [Delay the AI Overlords: How OAuth and OpenFGA Can Keep Your AI Agents from Going Rogue](https://www.wearedevelopers.com/videos/1637-delay-the-ai-overlords-how-oauth-and-openfga-can-keep-your-ai-agents-from-going-rogue) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Software Engineer Salary London](https://www.wearedevelopers.com/magazine/252-software-engineer-salary-london) - [93 Java Interview Questions You Should Prepare For](https://www.wearedevelopers.com/magazine/14-93-java-interview-questions-you-should-prepare-for) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers) - [Fullstack Developer Salary UK](https://www.wearedevelopers.com/magazine/251-fullstack-developer-salary-uk) - [What’s the Difference between a Junior, Mid, and Senior Developer?](https://www.wearedevelopers.com/magazine/238-what-s-the-difference-between-a-junior-mid-and-senior-developer)