Project-related support
Staffing bottlenecks


First-class, experienced Controllers (hands-on implementation experts rather than theory-orientated consultants)


Whenever you need outstanding specialist
competencies or greater expert staffing capacity


In and with your own
team on-site

Typical engagement scenarios

  • Rollout of new ERP/BI systems/tools
  • Business-process digitalisation
  • Master-data harmonisation
  • Creation of new Controlling structures
  • Harmonisation of charts of accounts
  • Cost-centre structure optimisation

Typical roles

  • Programme and Project Lead
  • Project Manager
  • Analyst/Specialist

What you offer:

  • You love your job in Finance & Controlling and relish challenges
  • You are a genuine and communicative team player with an excellent personal presence
  • Taking decisions, strong self-initiative and absolute integrity are part of your DNA
  • You have 2 – 4 years’ professional experience in Controlling/Accounting in medium-sized to large companies or major corporate groups
  • You have an outstanding level of German and at least one other commonly used foreign language
  • You have full mastery of MS Office and the most common Controlling tools (SAP, S4 Hana, Oracle, Navision, SQL, VBA, BI, etc.)

What we offer:

  • A tailored plan to achieve your career goals, designed around your individual talents
  • A steep learning curve and above-average development measures
  • Flat hierarchies, transparent communication and a genuine team atmosphere
  • A healthy work-life balance and flexible worktime models
  • Challenging projects in differing business sectors at companies close to our offices (up to 100 km max.)
  • A market-competitive remuneration package
  • Professional onboarding, coaching and mentoring by experienced executives

We’re only happy if you’re happy – your goal achievement is our success.

Stephan Mathes
Managing Director

Stephan Mathes is Managing Director, Treuenfels Project Runners. As a provider of stimuli and creator he ensures the optimal development of our people.
He brings with him many years of experience as CFO and COO at internationally active companies in a range of business sectors. As an Interim Manager and Founder of a successful company consultancy he has outstanding expertise in strategic, business development and company growth-related topic areas. With a degree in Business Economics he launched his professional career at Arthur Andersen in Auditing and Tax Consultancy. His sound implementation knowhow in Accounting and Controlling and his extensive project management experience provide a rock-solid foundation for his conceptual skills.

Heiko Vollmer
Business Manager / Director

As Business Manager Heiko Vollmer develops and manages the Treuenfels Project Runners team. He convinces clients of the potential that can be leveraged through deploying our Project Runners, to successfully achieve the clients’ Finance & Controlling project goals. Heiko continually supports clients throughout project implementation and provides his specialist expertise whenever required.

With a degree in Macroeconomics from Muenster, Heiko can look back on 19 years’ professional experience in the Finance departments of telecoms companies in Germany and abroad. Particularly notable assignments were almost 7 years’ service at Swisscom in Switzerland, as well as at Vodafone in the UK, Germany and the Netherlands, where he became Head of Controlling. Before joining Treuenfels Heiko led the Finance Area of the SGS Group in Germany.

Maik Zallmann
Business Manager / Director

Maik Zallmann is Director of Operational Excellence. His task area comprises the selection and hiring of our Project Runners as well as their coaching and personal further development within the Treuenfels team, defining our executives’ Business Partner roles, and securing the most up-to-date methodological standards and technologies for deployment in the projects we run. Prior to his work at Treuenfels, the International Commerce graduate was active as a Project Consultant for Horváth & Partners at medium-sized companies as well as large corporate groups, leading a Finance & Controlling Competence team. He has been on board with Treuenfels Project Runners since our foundation.

Térésa Hoffmann-Becking
Business Consultant

Since November 2018 Térésa Hoffmann-Becking has held responsibility for the set-up and expansion of the Banking Project Runners business area. As a Business Consultant she acquires new clients and supports their Finance and Controlling departments in assigning project team staff. Térésa hand-picks qualified (Risk) Controllers from her team, assigns them to the right project and accompanies them throughout the project’s implementation. She drives the continual expansion of the Project Runners expert group.

Térésa holds an MSc. in Business Economics and brings with her several years’ hands-on experience in private wealth management, business development and project management gained at Privatbank Rothschild and Oddo BHF AG.

Julia Petrich
Business Manager

Julia Petrich has held the post of General Manager at our Frankfurt am Main Office for the Hesse region since March 2020. She supports CFOs and managers in Finance and Controlling with Project Runners with extensive methodological experience in digitalisation, system migration, corporate planning and cost management.

The Banking graduate (ADG) has comprehensive theoretical knowledge through her qualifications as a Certified Associate Project Manager, in Conflict Management, Strategy Facilitation, Rhetoric, and Project Communications as well as deep practical project-management expertise. With over 15 years’ hands-on experience in Controlling and operative strategic management she has developed a deep understanding of project requirements at both a national and international level. Following positions in private banking, property finance, bonds and a development aid bank, before joining Treuenfels Julia accompanied the founding of a captive bank in the automotive sector outside the EU.

Johanna v. Treuenfels
Business Manager

Johanna von Treuenfels holds responsibility for leading and further developing the Project Runners team focused on the Banking and Insurance sector. With her degree in Physics and Mathematics she has an analytical, solution-orientated background: for several years she was active at financial institutions as a Lead Consultant for the implementation, further development and validation of internal models as well as economic instruments and methods. Furthermore, thanks to her five years as a Risk Controller she knows the tasks that banking projects entail – a particular challenge given the continual flow of new statutory requirements from European banking regulators.

With this professional background, as Business Manager at our Frankfurt Office she is best-placed to provide her team with highly motivating projects and Treuenfels clients with optimal support.

Thilo Seeger
Business Manager

Thilo Seeger is a business manager at Treuenfels Projects. Since the opening of our branch in Stuttgart in June 2020, he has been using his expertise and an extensive regional network to establish Treuenfels Projects in one of the strongest economic regions in Germany.

With his 20 years of professional experience at the intersection of IT and Finance, he now contributes to achieving the ambitious growth targets of Treuenfels Projects. Before joining Treuenfels, he was a partner at Theron Management Advisory Group in Hamburg where he was in charge of establishing the Logistics and Finance branch of Theron Practice. Before that, he was regional CFO at DHL. His focus in Stuttgart is on the state of Baden-Wuerttemberg with its many economic powerhouses and hidden champions.

Claudia Cajic
Managing Director

Claudia Cajic has been Managing Director of Treuenfels GmbH Projects since January 2021 and is responsible for expanding the business in northern and eastern Germany. Her focus is on Controlling, Accounting, Treasury and Internal Audit. The core business is providing operational support for our customers‘ Finance departments through Treuenfels Project Professionals and Project Managers.

Claudia was previously a Member of the Executive Board of a financial management consultancy for over ten years, with responsibility for setting up and further developing the Interim Management Department, as well as for a Hamburg office that opened in 2017. Prior to that, her responsibilities included roles in International Project Management and Controlling at Deutsche Lufthansa AG.

Carmen Rupprecht
Business Manager / Director

In January 2022, Carmen Rupprecht joined the Treuenfels Projects team in Hamburg as a business manager and director. She is responsible for the supervision and growth of our Project Professionals as well as the further organisational structure. She supports both our sales department and our customers as a specialised contact person.

With a diploma in business administration, she has built an in-depth expertise in all facets of operational and strategic controlling – primarily at publicly traded companies.

In addition to her experience as a strategic organisational consultant, she has led an HR department in the process of a company’s transformation.

Sarah Fischer
Business Manager

Sarah Fischer has been responsible for Customer Care at Treuenfels GmbH Projects in Hamburg as Business Manager since March 2021. In personal discussions, she develops suitable solutions for our clients in the Finance & Controlling area. She ensures the optimal specialist and personal staffing of Project Professionals in accordance with clients’ requirements, as well as the optimal composition of successful project teams.

Before joining Treuenfels, the qualified Business Economist dedicated her skills to developing a financial management consultancy’s Hamburg office, playing a major role in shaping it through acquiring various DAX, MDax and Mittelstand corporate client accounts.

Marina Ostermann

Since March 2021 Marina Ostermann has been responsible as HR Manager for Personnel Development at Treuenfels GmbH Projects in Hamburg.

Alongside Recruiting, she is responsible for relevant HR projects and personnel development strategies.

The qualified Business Psychologist is also a trained Coach and brings with her many years of HR experience, acquired both in international corporate groups as well as in the consulting sector.

Her focus so far has been on Recruiting and Personnel Development. In addition to the latter, she was responsible for the permanent assignment of positions in Finance at Treuenfels, enabling her to make a significant contribution to the company's growth.

Get in touch with us

Are you looking for support in managing your projects? Whether you need highly specialised knowledge transfer or expert staffing support for your teams, we are right by your side.

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    Our Offices

    Treuenfels Düsseldorf
    Carlsplatz 22
    40213 Düsseldorf

    T +49 211 90 98 79 – 00
    E duesseldorf@treuenfels.com

    Treuenfels Frankfurt am Main
    Zeil 109
    60313 Frankfurt am Main

    T +49 69 870 03 91 71
    E frankfurt@treuenfels.com

    Treuenfels Stuttgart
    Rotebuehlplatz 23
    70178 Stuttgart

    T +49 711 49 00 81 90
    E stuttgart@treuenfels.com

    Treuenfels Hamburg
    Steinhöft 11
    20459 Hamburg

    T +49 40 707084-0
    E projects@treuenfels.com