I applied through a recruiter. I interviewed at Datadog (Paris) in Feb 2026
Interview
HR call
Technical Screening (includes both fundamental ML / statistics and applied case study around time series anomaly detection).
Full loop interview including case study, data analysis case, ML architecture design, coding, and behavioural / leadership interview.
Interview questions [1]
Question 1
Explain how to run a linear regression on a very large dataset.
The closed form solution cannot be considered.
You should look at approximations.
The interview process was very well organized and professional. Elisa Medina, the recruiter, was extremely friendly, supportive, and communicative throughout the process. I especially appreciated her transparency, kindness, and effort to coordinate the interviews. The conversations with the team were thoughtful and relevant to my experience as a Senior Data Scientist. Overall, I had a very positive candidate experience.
I applied through an employee referral. The process took 2 weeks. I interviewed at Datadog in Nov 2025
Interview
Had a phone screening call with Recruiter covering past experience and current aspirations. Passed on to the Technical Fundamentals interview that focused anomaly detection on a time series and OLS regression with computational constraints
Interview questions [1]
Question 1
You are given an extremely large dataset with a target column. How would you go about modeling it assuming the dataset is too big to processed in memory?
