I applied online. The process took 4 weeks. I interviewed at Datadog (Paris) in Apr 2024
Interview
Process took between 2 to 3 weeks, and had 3 rounds :
- first round was a call with the hiring manager to ensure that's fit for the position.
- second round was a coding interview where you have to solve two programming problem with some follow up questions ( the problem were typical LC easy to medium)
- third round was the vitual onsite which is 5 interviews that can be scheduled in one day or split :
- 2 Coding interview : not really LC but more problem emulating real word scenario , like implementing a buffer read or parsing logs
- 1 system design: where you will have to draw the higher level design for a system and explain the choices you made.
- 1 system interview: this is more a discussion around a project or platform you worked on where you have to explain how it works and be able to answer why certain decision are made ( the goal was to asses whether you're curious enough to understand how all the parts fits together).
- Experience & Values Interview : this is a behavioral interview in typical FAANG style, you better have a list of scenarios you went through to answer the questions.
The interview process was great, the hiring manager was very friendly he called me multiple times to give either advice for next steps or to provide feedback. the people that interviewed me were very nice and welcoming they let me ask all the question that I had and never felt pushy, generally the process made me feel appreciated and respected which reflects a great company culture.
for preparation it's the same as other big tech companies, make sure you practiced enough LC and are up to date in term of system design.
Interview questions [1]
Question 1
coding interview : I got one DFS and one greedy algorith
I applied through a recruiter. I interviewed at Datadog (Tel Aviv-Yafo) in Jun 2026
Interview
They will let you go through 3/4/5 sessions, an hour+ each, and then eventually won't even let you know you didn't pass (even after 3 weeks, yep) if you won't reach out manually. This is how much they care about candidates. Take that into consideration when you think about starting a process. Super disappointing.
Interview questions [1]
Question 1
AI Coding Session
Classic coding session
System design
Agentic System Design
I applied through a recruiter. I interviewed at Datadog
Interview
The process is long, but I was accompanied by the HR recruiter, which was very helpful explaining the process and expectations. I reached the end of the process, but did not receive an offer. The process includes LLM design, live coding, AI assisted coding, Backend system design, experience & values. The hiring bar is high, prep well and do your best!! In the worst case, you will learn more :)
I applied online. The process took 2 weeks. I interviewed at Datadog in May 2026
Interview
I was approached by a recruiter about the role.
The recruiter screen was below average — brief and surface-level, with little real discussion of the role or my background.
Next up, the hiring manager screen was originally scheduled a week in advance and cancelled 3 hours before it was due to start due to a "calendar conflict." I rescheduled the same day, offering the next two available days. They picked the second — a Friday that happened to be a public holiday in my country — and the only available slots for an EU-based candidate were in the evening. I took the call at 8 PM on a holiday.
The hiring manager joined 5 minutes late with no acknowledgement of either the reschedule or the delay, and no real introduction. The interview itself felt more like a recruiter screen — "tell me about yourself," brief questions about past experience — and lasted about 20 minutes before he seemed ready to wrap up, despite the meeting being scheduled for 45. I extended it to the full time with my own questions about the team's technical direction and roadmap.
His closing line was roughly "thanks for chatting, bye" before hanging up.
No follow-up came from Friday through Wednesday. I reached out asking for any update, and received a reply informing me the position had "just closed." Based on the hiring manager's demeanor during the interview, I suspect the role was effectively filled before or during our call — which raises questions about why the process continued at all.
The recruiter was responsive and professional throughout. The rest of the process was not. If you're considering interviewing here, go in with calibrated expectations around communication and candidate experience.