Freelancer profile translated to English.
Back to original languageAbout Dennis
Senior Java Backend Developer with over 8 years of experience in the development and enhancement of stable enterprise applications in the public sector.
Focus on Java EE, WebLogic, and Oracle databases, as well as the design and implementation of robust REST and SOAP interfaces.
Emphasis on Clean Code, testability (JUnit, Mockito), maintainability, and sustainable architecture in established system landscapes.
Experience in agile teams (Scrum / SAFe) and with production-critical applications.
Available for remote work, reliable, structured, and focused on production.
German
Native or bilingual
Remote only
Primarily works remotely
Experience
- Deutsche Rentenversicherung BundSenior Java Developer / Software DeveloperSeptember 2017 - Today (8 years and 9 months)Berlin, GermanyDevelopment, maintenance, and enhancement of complex Java-based enterprise applications in a governmental environment.Use of Java EE / Java 8+ in conjunction with WebLogic Application Servers as well as Oracle, MySQL, and Derby databases.Design and implementation of SOAP and REST interfaces, including testing and quality assurance (JUnit 5, Mockito, SoapUI).Work in agile teams according to Scrum / SAFe with a focus on Clean Code, code reviews, stable architectures, and sustainable solutions.Currently contributing to modernization projects, particularly the technical transition of existing Java 8 applications to Java 21 and migration to WebLogic Server 14 in established enterprise environments.
- Deutsche Rentenversicherung BundApprentice IT Specialist for Application DevelopmentSeptember 2014 - September 2017 (3 years)Berlin, GermanyPractice-oriented dual training with a focus on Java development, databases, and object-oriented software development. Participation in internal applications and initial experience with enterprise environments.
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Certifications
- Certified SAFe® 6 PractitionerSAFe by Scaled Agile, Inc.2025