Arnaud de Theux

About

15+ years of Customer Service & Customer Experience expertise across different countries and industries
Partnerships with high-potential startups, mostly in Switzerland, at the seed and VC stages


I began by leading a customer service team in a telecommunications company in Belgium.

I subsequently worked as a Sr. Strategic Solutions Consultant at Zendesk, in London.
In this role, I partnered with the Enterprise Sales team to develop account and opportunity strategies.
- Helped close deals for a total of two-digits millions $ ACV (EMEA), and witnessed the highest win rate with ~60% of deals touched that closed.
- Instrumental in creating an ROI model & analysing the gains of implementing Zendesk, while building and demonstrating PoCs, and leading the scoping of professional services packages.
- Won “Over Achiever” and “Enabler of the Year” awards. Worked on the biggest EMEA deals such as Tesco, Booking.com, Just Eat & EuroTunnel.

Lastly, I founded ADT Consulting in Switzerland.
My goal is to understand a client’s business needs, and transform that into some form of solution definition, meeting or exceeding their measurable business goals for customer service. I aim to ensure clients understand the technical and business value the software can deliver.

I also advise institutional investors (via Guidepoint, Tegus, AlphaSights, Coleman Research, …) wishing to gain a better understanding of the CX industry.
Following these experiences, I’ve founded ADT Invest.
We partner with high-potential startups, mostly in Switzerland, at the seed and VC stages. During that partnership, we provide dedicated, hands-on mentorship and strategy guidance.

More

  • Studies: Economy & Business Management
  • Trainings: Sales Methodology: Discovery and Qualification (2 days, Franklin Covey), Personal Leadership & Influence Programme (3 days, DDA Consulting)
  • Speaker:Customer Experience, UK Contact Centre Forum , WorldwideService Desk Institute
  • Volunteering: Headstart Network Foundation, Red Cross Blood Drive
  • Language: French, English, German (ein bisschen)
  • Sports: (Trail) Running, Mountain Biking, Cycling, Skiing, Swimming

Recommendations

Don't take my word for it


It's rare that you come across standout talent like Arnaud. Highly intelligent, technical, consultative and incredibly efficient. He expertly executed his work and naturally took on a leadership role simply by being outstanding at his job. I was particularly impressed by his ability to handle a high level of transactions effortlessly.

VP, Solutions Consulting

Zendesk

Always willing to support and coach his internal and external customers as well as his direct colleagues, Arnaud has been fundamental to the success, growth and development of the EMEA presales team.

Director, Solutions Consulting

Zendesk

Always looking for the right answer for the customer, Arnaud would go above and beyond in ensuring customer happiness. His ability is to understand complex business goals and think of creative ways that the goals could be met.

CMO

CloudIQ

Whether its working to close deals, coaching others or collaborating across teams, Arnaud always demonstrates strong leadership and business acumen in whatever he does. An incredibly hard worker, with excellent customer skills, it's no wonder Arnaud has been instrumental in closing some of Zendesk's largest commercial opportunities..

Head of Customer Success

Slack

Arnaud has a wonderful sense of customer satisfaction, going above and beyond what is expected.

Global Customer Service

Deezer

Arnaud was quick to decipher our requirements.

VP Customer Engagement

TUI Marine

Resume

Summary of work experiences

Experience

Managing Director & Founder

ADT Invest
2025 - Present

Pully, Switzerland

  • We partner with high-potential startups, mostly in Switzerland, at the seed and VC stages. During that partnership, we provide dedicated, hands-on mentorship and strategy guidance.
  • 📈 FinTech: digital asset management, wealth planning & structuring, forecasting (no crypto...)
  • 🤖 AI: niche use cases where AI adds tremendous value and the “AI” name is not smoke & mirrors
  • 🏗️ Infrastructure: fills the gaps in public transport and energy transport
  • ♻️ Climate: DAC, solar industrial heating & storage

Managing Director & Founder

ADT Consulting
2018 - Present

Pully, Switzerland

  • Our mission is to understand our client’s business needs, and transform that into some form of solution definition, meeting or exceeding their measurable business goals for customer service.
  • With over 15 years of CX expertise, we ensure our clients understand the technical and business value that Zendesk products can deliver, while providing value-added advice and strategies to optimise their customer service operations.

Strategic Solutions Consultant

Zendesk
2013 - 2017

London, UK

  • Partnered with the Enterprise & Strategic Sales team (mostly in UKI, France & AME) as a pre-sales consultant to develop account and opportunity strategies.
  • Created ROI model to submit ROI examples to prospects & analyse the gain of implementing Zendesk.
  • Built & demonstrated PoCs, lead the development of services proposals & Statements of Work.
  • Trained the whole EMEA Sales & Account Mgmt. teams on how to do great product demos.
  • Speaker at customer events about customer experience, machine learning, and Zendesk in general.

Head of Support

Mondial Telecom
2008 - 2013

Brussels, Belgium

  • Managed the wholesale Customer Support team. Reported to the CEO.
  • Managed B2B accounts and followed up issues and change requests with Sales and Development team.
  • Worked in direct contact with Operations and Development team, following the Agile methodology for deliveries.
  • Recurring travels on-site to update the Customer Support teams working with us; demos of new features of the product over time.
  • Set up a "Labs" environment to allow beta testers to easily test the service and report bugs. Followed up bugs and features requests in JIRA with the Development team.

Contact

Get in touch


Location:

Pully, Switzerland