Oscar Jürgen Hartmann

Executive Director | Steuerberater at do Finance Inc.

Overath, North Rhine-Westphalia, Germany

About

In finance, numbers tell a story. For more than four decades, I have helped leaders understand what their numbers are truly saying — and more importantly, what they should be doing next. My journey began in 1980. Since then, I have worked at the highest levels of financial leadership — as a Steuerberater, senior financial specialist, executive advisor, and strategic consultant to decision-makers navigating growth, crisis, transformation, and succession. What differentiates my work is not technical expertise alone — although that foundation runs deep. It is perspective. Having advised companies across economic cycles, regulatory shifts, and generational transitions, I have seen how fragile success can be without strong financial architecture — and how powerful an organization becomes when finance moves from compliance to strategy. Today, as a Chief Executive Consultant in Finance, I partner directly with: • CEOs and executive boards • Entrepreneurs and family business owners • Investors and private equity stakeholders • Companies preparing for expansion, restructuring, or succession I help leaders answer the difficult questions: Is your capital structure built for resilience? Are your tax and governance frameworks enabling growth — or limiting it? Is your organization financially prepared for the next decade? My expertise spans strategic financial design, corporate structuring, M&A advisory, risk governance, and long-term wealth preservation. But beyond structure and systems, my work is about clarity. Clarity in complexity. Confidence in uncertainty. Direction in times of transition. After more than 40 years in senior finance roles, I believe one principle above all: Sustainable success is never accidental. It is architected. And finance — when properly led — is the blueprint.

Experience

  • Executive Director | Steuerberater at do Finance Inc.

  • Financial Advisor at Thomas Lenz
    Jan 2021 - Present · 5 yrs 6 mos

    Résilience, Accounting,

  • Chief Financial Officer | Investment Specialist at Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH
    Mar 2020 - Nov 2024 · 4 yrs 9 mos

    Increased annual revenue by 38% over 3 years, scaling turnover from €45M to €62M through strategic pricing, cost optimization, and expansion into new markets. Improved EBITDA margin from 14% to 22%, delivering a €6.5M increase in operating profit through restructuring and operational efficiency programs. Reduced operating expenses by 18% (€4.2M annually) by renegotiating supplier contracts and implementing zero-based budgeting. Strengthened cash flow position, improving free cash flow by +45% year-over-year, and reduced cash conversion cycle from 78 days to 52 days. Secured €25M in growth financing (equity and debt), lowering cost of capital by 2.3 percentage points.

  • Head of Finance and Accounting at gicom
    Dec 2021 - May 2022 · 6 mos

  • Managing Director Finance at ADTP Group GmbH
    Dec 2020 - Jul 2021 · 8 mos