I know both sides of the table.
15+ years in IT, digitalisation and transformation projects as a requirements engineer, business analyst and project manager, including work for Aurubis, Airbus, AUDI, KUKA and BorgWarner.
Trained mediator with a focus on commercial mediation, Certified Professional Coach. Alongside that, the methods your projects run on: PMI project management, Scrum and SAFe, requirements engineering and change management.
International projects negotiate in English. People still tend to argue in their mother tongue. I work in German and English, and I also understand Polish, Spanish and French.
I am not the coach you first have to explain a sprint review to. And not the consultant who treats a conflict as a communication problem.
Business mediation
PMI
Scrum
SAFe
IREB
PROSCI