Constantin Krüger

Profile

Passionate technologist and product owner with 18+ years of software development experience, combining deep technical expertise with strategic product vision. I build innovative solutions, contribute to open source projects (AsciiDoc, Antora, FHEM), and drive DevOps excellence through automation. As a natural leader, I guide cross-functional teams and foster knowledge sharing through user groups and technical chapters. My automation expertise spans enterprise CI/CD pipelines as well as personal home automation projects. Beyond technology, I serve my community as a volunteer firefighter, demonstrating the same commitment to teamwork and problem-solving under pressure. When I am not coding or responding to calls, I spend time in my woodworking workshop, listening to vinyl records, or tinkering with smart home technologies—always applying the same attention to detail and passion for optimization that shape my professional work.

Experience

1&1 Telecommunication SE

Karlsruhe, DE

Product Owner CI/CD Platform & DevPortal

September 2022 - Present

  • Develop a next-generation CD application as a successor to Jenkins
  • Own and evolve the central CI/CD platform (Jenkins, SonarQube, Dependency-Track)
  • Own and evolve the central DevPortal
  • Drive the standardization of CI pipelines through a recipe-based approach
  • Drive the standardization of CD pipelines through YAML-based pipeline configuration
  • Implement CI/CD pipelines using Groovy-based Jenkins shared libraries
  • Lead the Technology Lifecycle Management Board
  • Contribute actively to language standardization user groups
  • Serve as a member of the Gauge Support Group, standardizing Gauge-based E2E test integration in CI/CD pipelines and Jira-based pipeline run documentation
  • Serve as a member of the Enterprise Architecture Board, responsible for defining and maintaining the enterprise architecture

    Senior DevOps Continuous Delivery Engineer

    September 2020 - August 2022

    • Develop and maintain CI/CD pipeline script libraries for Jenkins
    • Run and maintain Jenkins, SonarQube, and Dependency-Track instances
    • Build and maintain base Docker images for operating systems and multiple programming languages

      LOHRFINK software engineering GmbH & Co. KG

      Stuttgart, DE

      Freelance Technical Consultant

      September 2015 - Present

      • Optimize source code generation in Java, Perl, and Node.js based on a rule model
      • Develop and maintain a Maven plugin that generates test cases and source code based on a rule model

        Deutsche Bausparkasse Badenia AG

        Karlsruhe, DE

        Software Architect

        Jan 2008 - Aug 2020

        • Serve as a leader and member of the Software Architecture Board
        • Organize a hacker group to foster knowledge sharing
        • Take responsibility for the software development platform (Eclipse, Jenkins, SonarQube)
        • Design and develop a deployment system, a time-tracking tool, and a metadata model for IT governance
        • Develop and maintain an automated test runner for Natural on z/OS
        • Work as an architect on several z/OS projects
        • Develop and introduce an Enterprise Service Bus
        • Develop a portal-based application for tariff calculation
        • Provide expertise in Lohrfink decision tables
        • Lead the architectural migration of the core banking system to a new platform based on Java and Oracle
        • Take responsibility for the Scheduler Platform Universal Controller (Stonebranch)

          Education

          Diploma in Business Informatics (BA)

          Duale Hochschule Baden-Württemberg (DHBW) Karlsruhe

          Sep 2005 - Sep 2008

          photo of me
          • +49 177 9704 051
          • cv@constantin-krueger.com
          • constantin-krueger.com
          • Germany, Bruchsal
          • uniqueck

          Skills

            • Programming
            • Java (Spring Boot)
            • Groovy
            • Node.js
            • Python
            • Bash
            • Perl
            • Natural
            • RPL
              Frameworks
            • Spring Boot
            • Thymeleaf
              Developer Tools
            • Git
            • Docker
            • Jenkins
            • GitHub Actions
            • K8S
            • Helm/Helmfile
            • PostgreSQL/Oracle
            • Maven/Gradle/npm/uv
            • Gauge/Cypress/Cucumber
            • Artiactory
            • Bitbucket
            • Grafana
            • Prometheus
              Documentation
            • AsciiDoc
            • Asciidoctor
            • Antora
            • Reveal.js
            • Rochade (Metadata Repository)
              Misc
            • Clean Code
            • Bee360
            • Domain-Driven Design
            • Behavior-Driven Design
            • Agile (Scrum, Kanban, SaFe)

          Languages

          • German
            Native
          • English
            B2
          • Russian
            A1
          • Spanish
            A1

          Diplomas

          • ISAQB Certified Professional for Software Architecture Foundation Level (2019)
          • ISTQB Certified Tester Foundation Level (Juli 2022)
          • A-CSPO Certified Scrum Product Owner (2025)

          Interests

          • Vinyl
          • Board Games
          • Woodworking