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Ghislain Tchangang DjionangGT

Ghislain Tchangang Djionang

Senior Product Owner (MBA), Independent Consultant

€125/day
Mannheim, DE
15+ years

Average response time: 1 hour

About Ghislain

Senior Product Owner and Senior Technical Program Manager (MBA) with 15 years delivering complex, regulatedplatforms end to end in major German enterprises (Porsche, Mercedes-Benz Bank, Daimler Mobility, Unzer, Fiducia & GADIT). I own the arc from business case and technology assessment through architecture, SDLC, and vendor steering toaudit-grade production rollout at scale. I combine hands-on engineering depth (Java, Spring Boot, microservices, cloud)with program-level governance (BaFin, BAIT, MaRisk, ISO 27001, GDPR, IKS), multi-million-euro budget ownership, andexecutive-level stakeholder management. Trilingual at C2 (French native, German, English).
  • English

    Fluent

  • French

    Native or bilingual

  • German

    Fluent

Can work on-site
Mannheim (up to 50km), Frankfurt am Main (up to 50km), München (up to 50km)

Experience

  • Porsche AG
    Senior Product Owner
    November 2023 - Today (2 years and 8 months)
    Stuttgart, Germany
    Own Porsche's enterprise Atlassian collaboration and CI/CD toolchain for 20,000 internal and external users across 4 on prem instances. Mandate: hold platform stability and security while preparing migration to Atlassian Cloud SaaS. Budget steered: €2–3M per year. Vendor portfolio: 2 to 10 providers. Indirect PO leadership of a 7 to 10 person service-provider team (matrix model). Rationalized the plugin footprint from 55 to 30 across 4 on-prem instances, delivering ~€120k annualized cost
    • •
    Governance, Risk and Compliance Product management Stakeholdermanagement Agile Softwareentwicklung Artificial Intelligence (AI)
  • Daimler Mobility AG
    Tech Lead → Lead Software Developer
    March 2019 - October 2020 (1 year and 7 months)
    Stuttgart, Germany
    Technical leadership of a pay-how-you-drive telematics insurance product for Mercedes-Benz vehicles, owned by DaimlerMobility, covering 10,000+ connected vehicles across 12 European markets. Team: 3 internal Stuttgart-baseddevelopers.Architected and led the monolith → microservices migration (Java Spring Boot and Micronaut, Kubernetes on hybridcloudOpenShift), including API ecosystem design.Introduced TDD with 90% SonarQube coverage quality gate as a required merge criterion. Cut API response time by ~40% (internal benchmark) via systematic refactor of legacy endpoints.Shifted delivery cadence from a fixed release train to on-demand deployment, raising production deployment frequency. Removed material tech debt via structured codebase audits and team-wide refactor sprints. Mentored 3 junior developers through code review and pair programming; 2 advanced to senior level during my tenure.
    Digital Transformation Leadership Stakeholdermanagement CI/CD Change Management & Transformation Governance, Risk and Compliance
  • Mercedes-Benz Bank AG
    Senior Technical Program Manager (promoted from Product Owner)
    October 2020 - October 2023 (3 years)
    70 Stuttgart, Germany
    Mandate: close a BaFin 2019 F1 audit finding on the lack of a unified, auditable software development toolchain at MBB. Built the regulatory-compliant BizDevSecOps platform covering the full SDLC under BAIT 7. Budget: €5M over 3 years. Team: 2 internal + 7 external engineers. Internal customer base: ~50 developers. Started as Product Owner (6 months). Promoted to Senior Technical Program Manager after supervisor unavailability; took over stakeholder management, procurement, vendor contracts, steering committee representation, and program budget. Delivered a unified, auditable BizDevSecOps toolchain (GitHub, GitHub Actions, Artifactory, Teamscale, Jira,
    • • Confluence) inside the BaFin buffer window, closing the F1 finding and passing BaFin review. Covered the full BAIT 7 scope end to end: SCM, CI/CD, artifact management, test automation, release management, ticket management, documentation, business-requirements management, and IKS controls. Handed over rollout of 100 software projects to a successor Program Manager; rollout completed post-handover. Steered procurement and contract management for 7 external vendors on a €5M / 3-year envelope. Represented the program in steering committee and QA gates; authored decision papers for BaFin-relevant investment decisions.
    • •
    • •
    • •
    • •
    • • cloud OpenShift), including API ecosystem design. Introduced TDD with 90% SonarQube coverage quality gate as a required merge criterion. Cut API response time by ~40% (internal benchmark) via systematic refactor of legacy endpoints. Shifted delivery cadence from a fixed release train to on-demand deployment, raising production deployment frequency. Removed material tech debt via structured codebase audits and team-wide refactor sprints. Mentored 3 junior developers through code review and pair programming; 2 advanced to senior level during my tenure.

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Education

  • MBA
    Business and Society
    2023
    MBA
  • B.A.Sc.
    Hochschule Worms
    2012
    B.A.Sc.

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