Doctolib Software Engineer interview questions & guide 2026

The following questions are representative of the patterns reported by candidates. While specific tasks may vary by team, the underlying evaluation criteria remain consistent: a focus on clean code, architectural reasoning, and professional maturity.

Technical & Coding

These questions assess your ability to write maintainable code and your proficiency in core engineering concepts.

• How would you implement a function to find available appointment slots within a 7-day window?
• Can you refactor this specific snippet to improve its readability and performance?

Preparation at Doctolib should be methodical. The team values transparency, so use the provided materials—such as problem statements sent in advance—to practice your delivery.

Technical Proficiency – This covers your ability to write clean, production-ready code. You will be evaluated on your mastery of language fundamentals, your ability to apply TDD (Test-Driven Development), and your skill in identifying edge cases. To prepare, focus on writing tests first and ensuring your code is modular and easy to maintain.

System Design & Architectural Thinking – Interviewers look for your ability to connect business requirements to technical implementation. You must be able to explain the "why" behind your design, including database choices, API design, and scalability strategies. Be ready to defend your trade-offs.

Communication & Collaboration – Doctolib places a high premium on how you work with others. This is evaluated during pair programming and design sessions. Strength is demonstrated by asking clarifying questions, vocalizing your thought process, and accepting feedback gracefully.

Cultural Alignment – This focuses on your problem-solving mindset and your ability to work in a collaborative, mission-driven team. Be prepared to share concrete examples of how you have handled ambiguity, conflict, or professional growth in past roles.

The Doctolib interview process is designed to be transparent, collaborative, and highly structured. You can expect a series of stages that balance individual technical aptitude with team-based problem solving. The company prioritizes a "real-world" experience, meaning many technical rounds involve pair programming on business-relevant features rather than abstract, competitive-programming puzzles.

The process is generally rigorous, focusing on depth of knowledge and professional maturity. Throughout the journey, the recruitment team aims to provide clear expectations, often sharing the problem scope before your technical sessions. The overall philosophy emphasizes mutual fit; the interviewers are not just testing you—they are simulating what it is like to work with you on a daily basis.

The visual timeline above outlines the typical progression from screening to final behavioral assessments. Candidates should use this to pace their preparation, ensuring they allocate sufficient time for both deep-dive technical practice and thoughtful reflection on their past experiences. Remember that while the structure is consistent, the depth of technical questioning may scale with the seniority of the role.

Pair Programming & Feature Building

This is a core component of the Doctolib process. It tests your ability to translate requirements into working software while maintaining high standards for quality.

Be ready to go over:

• TDD (Test-Driven Development) – The ability to write failing tests first and implement code to pass them.
• Code Cleanliness – Writing code that is readable, modular, and follows industry best practices.

As a Software Engineer at Doctolib, your primary responsibility is to design, develop, and maintain high-quality features that support the healthcare ecosystem. You will work within a squad to deliver end-to-end solutions, which involves:

• Collaborative Development: Partnering with fellow engineers, Product Managers, and UX designers to transform business needs into technical specifications.
• Technical Excellence: Writing maintainable, well-tested code and participating in peer code reviews to ensure system health.
• Problem Solving: Identifying bottlenecks in existing systems and proposing architectural improvements to support our rapid growth.
• Knowledge Sharing: Contributing to a culture of continuous improvement by mentoring peers and documenting architectural decisions.

You are expected to be an active participant in team rituals, providing input on technical strategy and helping the team maintain a high velocity without sacrificing code quality.

A strong candidate for Software Engineer at Doctolib combines technical depth with a collaborative spirit.

• Must-have skills:

• Strong proficiency in a modern backend language (e.g., Node.js, TypeScript, Ruby).

• Experience with Test-Driven Development (TDD) and writing testable code.

• Solid understanding of database design and system architecture.

• Excellent English communication skills, as the team is international.

• Nice-to-have skills:

• Experience with microservices architectures.

• Familiarity with cloud infrastructure and CI/CD pipelines.

• Previous experience in a high-growth, fast-paced startup environment.

Candidates are expected to have a professional background that demonstrates both individual technical contribution and the ability to work effectively within a cross-functional team.

Q: Is the interview process difficult? A: Candidates generally describe the difficulty as average to challenging. The rigor comes from the focus on real-world application rather than "trick" questions. If you are comfortable with TDD and can articulate your architectural choices, you will be well-positioned.

Q: How much time should I spend preparing? A: While it varies, most successful candidates spend time reviewing their own past projects and practicing their ability to explain complex trade-offs. Since Doctolib often provides the problem statement in advance, use that time to research the domain and prepare your diagrams or logic flow.

Q: What is the culture like at Doctolib? A: Employees frequently highlight the professional, friendly, and transparent culture. The company values team members who are helpful, collaborative, and focused on the end-user.

Q: How long does the process take? A: The process is typically well-managed, though it can span a few weeks due to the number of stages (HR, technical, behavioral). Expect clear communication, but do not hesitate to ask your recruiter for updates if a stage takes longer than expected.

• Prioritize Communication: The interviewers are assessing your daily working style. If you are stuck or unsure about a requirement, ask clarifying questions early.
• Master TDD: The most recurring feedback is that Doctolib engineers value test-driven development. Do not skip writing tests, even if you feel pressed for time.
• Prepare for the "Why": In system design, having a working diagram is not enough. You must be able to justify every choice, from database indexes to communication protocols.
• Be Professional: Treat the pair programming session as a real collaboration with a teammate. Listen to feedback and be open to pivoting your approach.

Becoming a Software Engineer at Doctolib is an excellent opportunity to work on technology that makes a tangible difference in the lives of patients and doctors. The process is designed to be fair, transparent, and reflective of the actual day-to-day challenges of the role. By focusing on your core technical skills, mastering TDD, and preparing to discuss your architectural decisions, you can significantly improve your chances of success.

You can explore additional interview insights, practice questions, and preparation resources on Dataford. Stay focused, be yourself, and approach each stage as a professional conversation. We wish you the best of luck in your preparation.

The compensation data above provides insights into the salary ranges and components (such as base and potential equity) typical for this role. Candidates should interpret these figures as market benchmarks, noting that final offers are often adjusted based on individual experience, the specific team, and the local cost-of-living index of the office location.