The process was initiated by a referral in early September.

Shortly after, I was contacted for a classical HR screening interview to elaborate on my motivations, the next steps in the process, and an overall presentation of Datadog.

A first technical interview with a software engineer focused on dealing with errors in time series.

The next step was the take-home project, which can be time-consuming if you want to do it properly.

A debrief session was called by the recruiting team to get and share feedback.

The last round of three interviews (on the same day) took time to organize (three weeks):

• A technical interview involving regular expression matching algorithms, progressively becoming more complex.
• A system design interview where the interviewer had a deep knowledge of the technologies, making the interview challenging.
• A management interview requiring me to explain a recent experience in my current position, with follow-up and detailed drill-down questions.

A debrief session was called by the recruiting team to get and share feedback.

Each interview was very enjoyable. Datadog staff took the time to introduce themselves and their roles in the company. The discussions were open and respectful.

One of the main points of the interviews is to ensure a cultural match. Datadog's culture is unique (from what I've seen so far).

The overall process is rather long, but a tech recruiter is always available to answer questions about the process.

Errors in time series

Regular expression matching algorithm