Mathieu Perez is Co-Founder of COACH (YC S26), the AI sales coach purpose-built for in-person sales teams, helping reps and managers unlock peak performance through post-meeting video analysis and personalized AI feedback.

A French-born engineer and former professional footballer at Racing Club de Strasbourg, Mathieu earned a Bachelor of Engineering in Computer Science from the University of Pennsylvania and a Bachelor of Applied Science from EPFL, with prior internships at McKinsey and Company and QuantumBlack.

Mathieu and his co-founders were rejected by Y Combinator 8 times across 4 different startups over two years before being accepted into the prestigious YC S26 batch with COACH, a testament to his relentless resilience.

Before COACH, Mathieu co-founded Lucy, an AI-powered peer adviser app that grew to support over 5,000 students at Penn, Harvard, Bryn Mawr, and Holy Family University, and earlier co-founded Alsace Test, a pharma data screening venture.

COACH has already delivered a 32% average lift in conversion rates for its clients, enabling managers to coach 5x more reps and giving sales leadership full visibility into field performance for the first time.