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Thomas SiekmannTS

Thomas Siekmann

Interim CIO for Special Situations | SME | Reorg

€1,800/day
Hamburg, DE
15+ years
IT Strategy
IT Architecture
IT Security
Project Management
Change Management

Average response time: 1 hour

Freelancer profile translated to English.
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About Thomas

When companies need IT leadership in real exceptional situations, I step in — acquisitions, restructurings, insolvency continuations.
In insolvency proceedings, I work as C-IT-RO — Chief IT Restructuring Officer. That sounds like a title, but it's an attitude: keeping IT operations running, retaining key personnel, and building trust when the entire organization is under pressure. Anyone who has experienced this knows: this is the most difficult leadership task IT faces.
Focus Areas: → Post-Merger Integration (IT) · M&A Due Diligence → Insolvency Stabilization & IT Continuation → IT Transformation & Future Mode of Operation → Security Programs (NIS2, ISO 27001, SIEM, ISMS)
30+ years of IT leadership experience — multiple times in true special situations. Secured global IT operations for over 6,000 wind turbines during the Senvion insolvency, supported due diligence, led the complete integration into the Siemens Gamesa structure. Previously, global IT leadership at Unify/Deutsche Telekom with teams up to 230 employees and budgets up to 120 million EUR.

  • German

    Native or bilingual

  • English

    Fluent

Can work on-site
Hamburg (up to 50km)

Experience

  • SiekmannORG
    Interim Management
    January 2024 - Today (2 years and 6 months)
    Hamburg, Germany
    Security Program PMI Target Architecture
    Security program at a large IT service provider: leadership as a direct report to the COO, 50+ sub-projects, complete planning and implementation of integrated security measures from SIEM to emergency management. Coordination of CISOs and CIOs across business units. IT future architecture for an automotive supplier as part of a post-merger phase: definition of the target architecture, future mode of operation, review of make-or-buy decisions.
  • Exasol AG,
    CIO
    January 2021 - January 2023 (2 years)
    90 Nuremberg, Germany
    Scaling IT infrastructure for global growth strategy after IPO
    • ▪
    • ▪
    • ▪
    • ▪ Establishment of ISO 27001 and ISO 9001 standards
    Team restructuring, introduction of ITIL processes
    Budget review and investment planning
  • Senvion GmbH → Siemens Gamesa,
    CIO (Interim)
    January 2019 - January 2021 (2 years)
    Hamburg, Germany
    International manufacturer with 4,000 employees,
    Securing global service operations (>6,000 turbines) during the insolvency phase
    • ▪
    • ▪
    • ▪
    • ▪ Retained key IT personnel throughout the entire proceedings — despite insolvency uncertainty
    Support of the due diligence phase and accompaniment of the company sale
    Supervision of the complete IT integration into Siemens Gamesa
Check out Thomas's experience

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Education

  • Sociology of Technology
    University of Bielefeld
    1992
    Techniksoziologie
  • Leadership Excellence Program
    WHU Otto Beisheim School of Management
    2018
    Leadership Excellence Program
Check out Thomas's education

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