How to Pass the Doctolib Software Engineer Interview in 2026

The Doctolib DNA (TL;DR)

User-centricity for both patients and practitioners, deep empathy for healthcare workflows, and a strong focus on data privacy and security.

The Doctolib Interview Loop

Your onsite loop will typically consist of 5 rounds.

1
Round 1
Recruiter Screen
Motivation, role fit, logistics.
2
Round 2
Coding Screen
LeetCode-medium algorithmic problems under time pressure.
3
Round 3
System Design
Distributed systems, trade-offs at scale, architecture under constraints.
4
Round 4
Onsite Coding
LeetCode-hard, debugging, code clarity, edge cases.
5
Round 5
Behavioral / Leadership
Past evidence of ownership, influence, resolving conflict.

Based on our database of Doctolib interview outcomes, avoid these common traps:

No strategy for handling rate limits of external providers.
Not explaining the 'why' behind the chosen path.
Using too much jargon without explanation.
Ignoring the different legal constraints (e.g., SGB V in Germany vs. French regulations)

Three real prompts pulled from our database.

Type · Behavioral

Walk me through your most complex technical project and the impact it had.

Type · System Design

Design a secure system to store and share medical prescriptions between doctors and patients, ensuring GDPR compliance.

Type · Leadership

Tell me about a time you had to balance a high-impact feature request with strict data privacy requirements.

+ many more questions, signals, and worked examples

A sample from our database, grouped by round. Sign up to see the full set.

10 of 21 questions shown

1
Type · Behavioral
Tell me about yourself and why Doctolib? What specific challenges in healthcare technology interest you?
2
Type · Behavioral
Walk me through your most complex technical project and the impact it had.

3
Type · Algorithms
Given two lists of time intervals representing the availability of two different practitioners, find all time slots where both are available.
4
Type · Data Structures
Implement a 'Rate Limiter' for our public API that limits users to X requests per Y seconds.
+ 2 more questions in this round (sign up to unlock)

5
Type · System Design
Design the Doctolib appointment booking engine. It must handle high concurrency and ensure no double bookings.
6
Type · System Design
Design a secure system to store and share medical prescriptions between doctors and patients, ensuring GDPR compliance.
+ 1 more questions in this round (sign up to unlock)

7
Type · Debugging
You are given a piece of Ruby or JavaScript code that manages a practitioner's calendar. It has a bug where some slots are shown as available when they are already booked. Find and fix it.
8
Type · Algorithms
Implement a search autocomplete system for a directory of doctors. It should be efficient as the user types.
+ 1 more questions in this round (sign up to unlock)

9
Type · Leadership
STAR
Tell me about a time you had to balance a high-impact feature request with strict data privacy requirements.
10
Type · Conflict Resolution
STAR
Describe a situation where you disagreed with an Engineering Manager on a product priority.
+ 7 more questions in this round (sign up to unlock)