Interim & Independent Critical Mandates Lead

I take ownership of complex and critical mandates that require clear decisions, decisive action and reliable delivery.

Porträt of Sonja Thunnessen, interim manager for critical mandates

I am brought in when critical initiatives need to be set up from scratch, have become stuck, or are held back by structures, processes or execution that do not work.

I establish a clear view of the current situation, objectives and required action, develop concrete measures and lead implementation through to a robust outcome.

My focus is on functionally and organisationally demanding situations involving multiple dependencies and functions. I combine analysis, structuring and execution, taking ownership from the initial assessment through to stabilisation.

This helps avoid poor decisions and unnecessary follow-on costs, reduces risk, and stabilises critical initiatives or brings them successfully into operation.

Typical Assignment Situations

My work begins where

  • the real issue is obscured by numerous symptoms, individual problems or conflicting assessments

  • unclear objectives and requirements, pending decisions or difficult-to-manage dependencies are blocking an initiative,

  • critical delivery has stalled, is at risk or is not reaching completion despite pressure on outcomes and timelines.

I analyse and structure the situation, develop concrete measures and, depending on the assignment, lead the issue through to a decision, stabilisation, implementation or completion.

Areas of Engagement

  • Industries: Banking, financial services and insurance

  • Business and functional areas: Corporate Banking, Product Management, IT, Finance, Risk, Operations and Governance

  • Organisational settings: Corporations, corporate groups and larger mid-sized companies

  • Collaboration & leadership: Direct engagement with executive management, divisional heads and assignment sponsors; leadership of international cross-functional teams and external partners.

Selected Assignments in Analysis, Stabilisation and Delivery

International Managing General Agent | Structural Assessment of a Fragmented Finance Organisation

Situation: Following rapid growth and the consolidation of numerous entities, the organisation, processes and systems were not sufficiently integrated.

Assignment: Establish transparency on the key issues and the most urgent need for action.

Approach: Assessed the German finance organisation under a direct mandate from the Group CFO, structured the issues, and developed and prioritised concrete stabilisation measures as a basis for the organisation’s further development.

Outcome: Delivered a management-level view of the overall situation and a concrete package of measures for short-term stabilisation and further integration.

International Automotive Manufacturer | Stabilisation of a High-Risk Digital Project

Situation: An international web project for a key client was close to termination. Project status, scope and remaining effort could no longer be assessed reliably.

Assignment: Stabilise the project and secure continued delivery.

Approach: Conducted a current-state versus target-state analysis and reset planning, governance and collaboration.

Outcome: Stabilised the project and restored the client’s confidence.

International Bank | Development and Delivery of a Complex Financial Product

Situation: A functionally, technically and regulatorily complex product had not been implemented despite several previous attempts.

Assignment: Restructure the initiative and lead it through to production use.

Approach: Clarified functional requirements, dependencies and priorities, and led delivery across the functions involved.

Outcome: Launched the product, transitioned it into stable operations and significantly expanded the addressable investor base.

Education & Certifications

Education: Diploma in Physics (University of Tübingen & Arizona State University)

Certifications: PMI Project Management Professional (PMP), SAFe Product Owner / Product Manager (POPM)

Languages & Tools

Languages: German and English – full professional proficiency; Spanish – advanced

Tools: Microsoft 365, including Office, Teams and Project; Jira, Confluence and other widely used collaboration and tracking tools; generative AI

CONTACT

Is a critical initiative stuck, at risk or difficult to assess?

Let us discuss the situation and determine whether a focused mandate would help.sonja.thunnessen[at]thunnessen-consulting.com