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For a project we are looking for a Senior Java Developer (f/m/d).

Your tasks will be:
• Senior level Java software developing for a critical on-premise application platform
• Producing clean, efficient code based on specifications and guidance
• Develop intuitive software that meets and exceeds the needs of the company
• Professionally maintain all software and create updates regularly to address customer and company concerns
• Analyze and test programs and products before formal launch
• Troubleshoot coding problems quickly and efficiently to ensure a productive workplace
• Developing programs to actively monitor the sharing of private information
• Actively seek ways to improve business software processes and interactions
• Coaching and training of development team members on software components, software technology stacks and software development practices to ensure common standards and knowledge sharing within and across development teams
• Development and testing of new features and changes (functional and non-functional) for an on-premises distributed microservice-oriented application platform. This includes adhering to TMD guidelines while still providing enough flexibility to accommodate future changes with minimal effort
• Stability and robustness are extremely important since the application and its interfaces are essential for critical processes

Following Know-how is required:
• IT/tech-related academic degree (bachelor’s or master’s degree)
• 10+ years of experience using Java (8-21) technologies, including 5+ years using Spring Boot framework (incl. Spring data, Spring cloud, Spring security), Hibernate, JMX, Microservices, OpenAPI, Swagger
• Very good knowledge of application development and maintenance (ADM) in the Java world
• Very good knowledge of the Windows and/or Linux-platform
• Testing: Junit5, Spring Boot Test
• Frontend (5+ years): React, JavaScript, OIDC, Typescript
• Integration technology (5+ years): REST, AMQP, gRPC, OAS, SFTP
• Oracle SQL, Oauth2, Camunda, Hazelcast IMDG
• BuildDevOps (5+ years): CI/CD, Maven, Git, Jira, Confluence, Bamboo, Bitbucket, Apache Tomcat, JSP, Octopus Deploy
• Experience in developing with IntelliJ on Windows
• Experience in working in Scrum teams
• Energy industry know-how is an advantage
• Experience with test automation like Selenium, Playwrigth / Robot framework
• Language skills: English (C1) and German (B2) are necessary

Order Type: Freelance Contract
Location: Remote, Berlin max.5 days per 12 Month
Start: asap
Duration: 31.12.2026 (with option of contract extension)

If you are interested, please let us know your hourly rate (Remote / Onsite) and your availability. We are looking forward to your application quoting the reference-number 3800.

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