Customer Testimonials

Insights into successful interim management projects from our partners.

Data helps solve problems. Anne Wojcicki
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Your resonanz developer has some beautiful data for you, enjoy.
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It is a capital mistake to theorize before one has data. Arthur Conan Doyle
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Data helps solve problems. Anne Wojcicki
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Data helps solve problems. Anne Wojcicki
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Interim CFO as a Game-Changer

„Working with the Interim CFO was a game-changer for us. Within a few months, he not only stabilized our ERP processes but also empowered our team to work independently and efficiently. Now we can focus on our core business again“

A German SaaS start-up company

Strategic Interim Partner

“The Interim Manager succeeded in significantly increasing sales performance in just a few months, establishing the company in the housing industry, and finally taking on a leadership role within the company. Our expectations were exceeded. Thanks to the Interim Manager, we were able to significantly boost our sales performance, establish ourselves in the housing industry, and assume a leading position. She exceeded our expectations.“

A German PE telecommunications company

Interim Partner with a system

“Our quality management has been completely transformed thanks to the manager. From error analysis to supplier management, we can now operate more effectively on a global scale.”

A traditional German company with approximately 450 employees

Structural Interim Partner

“The Interim CFO brought clarity in the shortest time. Now we have enough data for strategic decisions.”

A subsidiary of a tax advisory group

Crisis-Tested Interim Partner

“Thanks to the structure and composure of the Interim Manager, we were able to overcome a crisis and now look forward to a future of sustainable growth.“

A mid-sized PE-backed company

Interim Partner with foresight

„The Exit Readiness function, serving as a central interface between the company and consulting firms, ensured the harmonization of information. The usual additional burden on operational management during a sales process was significantly reduced thanks to the support of the professional and experienced Interim Project Manager. Due to the professional execution, all time-related milestones were met throughout the entire sales process. It was possible to highly satisfy a demanding bidder group with the information provided.”

A mid-sized PE-backed pharmaceutical company

Competent Partner

“Within 15 months, the Interim Partner not only secured refinancing of over €2 billion but also radically streamlined the store portfolio and stabilized liquidity—all based on hard facts. Without him, we would never have concluded the bank negotiations so successfully.”

A Large-Cap retail company

Reliable Interim Partner

“The interim manager swiftly achieved significant improvements on the construction site and within the project team through exceptional dedication. In a tense overall situation, his high level of personal commitment and structural enhancements played a key role in driving a successful turnaround. Within a very short time, the interim manager’s outstanding efforts led to measurable progress—both on-site and within the project team. His contributions enabled the urgently needed turnaround to be successfully implemented.”

A globally leading healthcare provider

Decisive Interim Partner

“Thanks to the interim CEO, we finally gained the clarity we needed. Instead of continuing to invest in a non-scalable model, he courageously initiated its closure—socially responsible and with a clear vision for a fresh start. His impartial analysis was the key to breaking five years of stagnation and making a well-founded decision.”

A traditional Austrian metalworking companyn

Transformation-Driven Interim Partner

“Under the leadership of the interim CHRO, we successfully built our HR team while also setting the strategic course for global growth—establishing clear structures and fostering a motivated workforce.”

A leading IoT provider

Visionary Interim Partner

“The interim CTO didn’t just pull us out of crisis—he charted an entirely new path forward. With a clear vision, strong local leadership, and a genuine cultural transformation, we not only increased production by 30%—we’ve become a team that looks to the future with hope.”

A global high-tech leader

Problem-Solving Interim Partner

“This interim director excels at cutting through complexity and driving progress. He is highly analytical, quickly identifies the core issue, and presents tailored solutions—never shying away from tackling new challenges. Communication with him is fast, thorough, and always focused on results. He rapidly absorbs new initiatives, provides concrete and constructive recommendations for necessary changes, and implements them with surgical precision. He leads by example and rolls up his sleeves to get things done. It’s a pleasure to have someone like him on my team.”

A leading Swiss medical technology company

Dynamic Interim Partner

“Without the interim CIO, we would not have been able to commission our €400 million facility on schedule. In record time, he stabilized our IT, set clear priorities, and created transparency through agile methods. Today, we don’t just operate more efficiently—we’re also perfectly positioned for future projects.”

A leading European glass packaging manufacturer

High-Performance Interim Partner

“The HR transformation was the key driver of our growth. In record time, we not only established scalable processes and a strong employer brand but also laid the foundation for successful M&A integrations. Today, we’re ready for 2,500 employees—with an HR team that thinks and acts strategically.”

An international consulting firm

Transformative Interim Partner

“What began as a planned sale turned into our greatest success. The interim CEO didn’t just restore profitability—he revealed the true potential of this business unit. Today, it’s not only our highest-revenue segment but also embodies the strategic vision guiding our family business into the future.”

An international specialty chemicals family enterprise

Two Interim Partner, double success

“This transformation didn’t just save us—it made us future-ready. By standardizing e-component production and systematically improving quality at our overseas plant, we’ve created processes that give us a decisive edge in the race for electromobility. What makes us particularly proud is the combination of efficiency and sustainability—this is true innovation in action.”

A major automotive family enterprise

Motivating Interim Partner

“In just six months, the interim CIO laid the critical groundwork for improving our IT organizational structure and successfully advanced the supply chain optimization project to our complete satisfaction. His open leadership style and ability to inspire motivated employees at all levels. As a result, the handover to the permanent CIO proceeded seamlessly.”

A globally leading family-owned specialty chemicals company

Empowering Interim Partner

“The interim CHRO didn’t just develop a future-proof concept—he empowered the team to drive it forward independently, with clear structures and a motivated workforce in place.”

A leading German family-owned company

Stablising Interim Partner

“The interim manager delivered a demanding transformation and consolidation program with rapid, tangible results. He established the foundation for sustained positive development. Our collaboration was defined by deep expertise, genuine passion, and critical objectivity—he consistently held up a mirror to challenge and guide us.”

A leading software development company

Interim Partner with a clear structure

“With the interim manager’s guidance, we didn’t just implement our ERP system—we gained the capability to leverage it independently, with clear structures and lasting success.”

A mid-sized retail chain with nearly 30 locations

Forward-Thinking Interim Partner

“The interim COO didn’t just significantly improve our delivery performance—he also set strategic direction for the future through data-driven decisions and resilient crisis management.”

A mid-sized company

Team-Focused Interim Partner

“In an exceptionally short time, the interim manager not only familiarized himself with our operations but, more importantly, built a foundation of trust with the team. With him, we found the right partner to support our growth in direct-to-consumer business. I can wholeheartedly recommend this interim manager.”

A leading European fashion manufacturer

Finance-Savvy Interim Partner

“The interim manager didn’t just make our currency risks manageable—he also empowered our team to apply the new processes independently and confidently.”

A leading cleantech manufacturer with international locations

Future-Proofing Interim Partner

“The interim manager didn’t just restructure our production—he built sustainable frameworks. With a clear strategy, LEAN methodologies, and a high-performing team, we’re now fully prepared for the future.”

A globally leading manufacturer of onshore wind turbines

Visionary Interim Partner

“Our decision to bring in external support was based on the interim manager’s extensive leadership experience in complex organizational structures. Within a new cross-functional team spanning market analysis, innovation, and operational execution, he successfully established the necessary foundations and accelerated approval processes beyond typical timelines. The result aligns perfectly with current market opportunities and our internal capabilities.”

A globally leading German manufacturer of renewable energy solutions

Efficient Interim Partner

“What did this interim manager achieve? He didn’t just streamline our processes—he demonstrated what true service excellence looks like: clear rules, efficient workflows, and maximum productivity—all without overburdening our team.”

A leading German manufacturer of electron beam and laser technologies

Reliable Interim Partner

“The interim manager didn’t just rescue our supply chain—he established sustainable SCM excellence through clear processes, digital tools, and team coaching, delivering measurable results from day one.”

A leading German manufacturer of household and personal care products