Alex Kaluzny

ALEX KALUZNY

Chief Technology Officer
Doctolib
Digital health B2B2C
2025 TOP 30 EMEA CTOs 2025

Career History

Doctolib is a French health-tech company that provides software to healthcare providers for appointment scheduling, online bookings, and telemedicine, allowing patients to view availability and book medical appointments without contacting clinics directly. With about €348m in annual recurring revenue in 2024, growing more than 20% year on year, and a user base of roughly 80 million patients and 400,000 healthcare professionals across Europe, it combines strong, predictable subscription income with rapid scale. The platform is built to meet strict health data regulatory standards and privacy requirements, and under Kaluzny’s tech leadership has placed special focus on AI-enabled assistance, search performance, and reliability.

Alex Kaluzny joined Doctolib in 2021 as Chief Product & Technology Officer, bringing experience from Egencia (CPTO) and earlier roles in tech leadership. Since stepping into the C-suite, he has led innovations to improve Doctolib’s appointment-search system, including precomputing available time slots to reduce latency in search, serving results in real time and improving how patients see earliest available appointments on the platform.

He holds a BS in Computer Science from the University of Illinois Urbana-Champaign and an MBA from Kellogg School of Management at Northwestern University.

About Doctolib

Founded in 2013 by Stanislas Niox-Chateau and co-founders, Doctolib is one of Europe’s leading health technology platforms. It supports tens of thousands of healthcare professionals and millions of patients across France, Germany, Italy and other markets throughout Europe, with its services spanning online appointment booking, telehealth consultations and patient communications.

In 2022, the company raised €500m in a mix of equity and debt, led by Eurazeo with participation from Bpifrance and General Atlantic, bringing its valuation to $6.4bn, at the time the highest for a French startup. Doctolib remains backed by venture capital and growth-oriented equity, and its valuation, funding and expansion into new product verticals have reinforced its position as a top-tier e-health unicorn.

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