Fractional CFO/COO for funded scale-ups and family offices. I step in during critical situations and build tech & AI-augmented finance and operations systems.
With 15+ years as an operator (Jumia, Glossybox, Orami, Ligerio ~€10M revenue), a developer background (TypeScript, AI, automation) and current Computer Science studies at Harvard, I help founders and family offices regain control: cash, operations and internal systems that replace the work of entire teams.
Finance · Ops · Tech & IA
Guillaume Stehelin de Taisne – Part-time CFO & COO
I work as a fractional CFO/COO for funded scale-ups and family offices looking for a trusted operator on their portfolio companies, combining financial structuring, operational execution and building internal systems (tools, automation, AI).
Guillaume Stehelin de Taisne, Part-time CFO & COO, personally leads every engagement to secure your growth.
Fractional finance leadership for funded scale-ups: reliable reporting, cash and runway visibility, fundraising preparation and design of internal tools (dashboards, alerts, automations) that reduce manual FP&A and reporting work.
Fractional operational leadership: mapping and simplifying processes, controlling flows (orders, inventory, disputes, support) and setting up internal tools and automations (workflows, AI) to do more with fewer people without losing visibility.
Emergency intervention and interim executive replacement for critical situations. I take control within 24–48 hours, secure cash, stabilize operations and rebuild minimum governance, then design systems to prevent the same crisis from happening again.
The performance of Guillaume Stehelin de Taisne at the heart of every intervention
Rapid and precise analysis of the financial, operational and human situation to identify priority action levers.
Development of a tailor-made recovery strategy with clear objectives and realistic deadlines.
Operational command with implementation of real-time control and reporting processes.
Continuous support with strategic adjustments based on results and situation evolution.
Guillaume Stehelin de Taisne – Part-time CFO & COO
They trust Guillaume Stehelin de Taisne for their growth and challenges
Founders and investors share the direct impact of Guillaume Stehelin de Taisne, Part-time CFO & COO.
"Guillaume Stehelin de Taisne has supported us through many complex situations (tax audits, sudden executive departures, management embezzlement suspicions, etc.). He is very effective, knows how to dive deep into details while maintaining a holistic view. I highly recommend him."
"Thanks to Guillaume Stehelin de Taisne, we structured our finance in 3 months and raised €2M. His Part-time CFO expertise allowed us to maintain control while accelerating our growth. A trusted partner."
"In crisis situation, Guillaume Stehelin de Taisne took command immediately. He implemented ZOHO CRM and restructured our processes. His ability to stabilize operations and reassure teams saved our company. A true "emergency" consultant."
"We mandated Guillaume Stehelin de Taisne during the sale of our company Glossybox (€70M revenue). The sale was blocked due to the quality of our financial data. Guillaume Stehelin de Taisne restructured the entire group (5 countries), brought everything into compliance with IFRS standards, and supported us during a tax audit on our holding company. The sale was finalized 8 months after his arrival."
"Guillaume Stehelin de Taisne completely restructured our operations. From cash management to process optimization, he transformed our company. An exceptional professional."
"His scaling expertise allowed us to grow from 10 to 100 employees without losing control. Guillaume Stehelin de Taisne knows how to anticipate growth challenges and implement the right tools."
