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      Senior Software Engineer - Frontend Interview

      4 Aug 2023
      Anonymous employee
      Accepted offer
      Positive experience
      Difficult interview

      Application

      I applied through a recruiter. The process took 3 months. I interviewed at Datadog in Jul 2023

      Interview

      A very long and challenging interview process. It was important to think out loud, propose multiple solutions and justify a single choice and to be able to give the time and space complexity for the solutions. I'd suggest listening closely to the suggestions of your interviewers, to consider the efficiency of your solutions (think memoization, virtualization) and to be explicit about the challenges, base cases, edge cases, and bottlenecks of the problem are. I'd suggest explicitly giving testcases for the coding challenges (e.g. `console.log(myFunction(1,2), 4)` ). There were several points were I could have exited the interview process if I did poorly. At the end of each interview, I could discuss the position with the interviewers and ask questions. My recruiter and I touched base frequently to make sure I understood everything and to debrief each interview. Specifically, my interview steps were: 0. HIGH LEVEL INTERVIEW WITH RECRUITER (30 min, Zoom). [EXIT POINT 1. Recruiter checked in with hiring managers.] 1. LIVECODING TECHNICAL SCREENING (1 hour, Zoom and Coderpad). [EXIT POINT 2.] 2. FRONTEND SYSTEM DESIGN (1 hour, Zoom and Excalidraw). 3. REACT LIVE CODING (1 hour, Zoom and Codepad). [EXIT POINT 3. ] 4. LIVE CODING (AGAIN) (1 hour, Zoom and Codepad). 5. HIRING MANAGER INTERVEW (1 hour, Zoom). [EXIT POINT 4.] At this point I was told that they were interested in hiring me, and I conducted placement interviews with the managers of two prospective teams. We agreed on the team that I was more suited for, but I was told that if I had not been a good fit for either team, they would have looked at other options. They sent along a formal offer which was exactly as I had discussed with the recruiter, and I accepted. Like I said before, it was a very long process. I ended up taking 3 months to do everything, this is mostly because of my busy schedule and wanting to leave time to prepare. All in all, my recruiters were amazingly helpful, gave great tips and were very clear what the offer was from the beginning, and and all of the interviewers were patient, clear, and open to the questions that I posed.

      Interview questions [6]

      Question 1

      0. HIGH LEVEL INTERVIEW WITH RECRUITER (30 min, Zoom). I gave an overview of my background, experiences, and a previous project I had worked on in some technical detail, and why the position was interesting to me.
      Answer question

      Question 2

      1. LIVECODING TECHNICAL SCREENING (1 hour, Zoom and Coderpad). 2 relatively easy (leetcode easy/medium) questions to be solved with js or ts. One was a typical string manipulation question which required no particular algorithmic knowledge, and the other one was a problem where knowing graphs was particularly helpful. I was allowed to do mdn searches or ask for help where necessary.
      Answer question

      Question 3

      2. FRONTEND SYSTEM DESIGN (1 hour, Zoom and Excalidraw). The task was to architect a solution for a frontend app (no need to discuss typical system design topics like load balancers, etc). The idea is to determine a basic design and user flow / UX for the application described. The major considerations were application performance, user interactions, frontend-backend interactions (what endpoints and what kind of data and why), data structures/state, and any libraries or techniques you would use. It was important to identify performance bottlenecks and their solutions (dom rendering, lazy loading, caching, etc.).
      Answer question

      Question 4

      3. REACT LIVE CODING (1 hour, Zoom and Codepad). Basic react problem. I needed to parse some data and display it in an existing app. It was important to be intimately familiar with react, to know my way around react hooks and think about efficiency and the readability of my code. I'd advise being particularly diligent concerning performance optimizations. Again, I was allowed to consult MDN, react docs, etc. TS or JS is fine. At one point, my computer started lagging and I had to quit the call and restart my computer. The interviewer was completely understanding and gave me some extra time.
      Answer question

      Question 5

      4. LIVE CODING (AGAIN) (1 hour, Zoom and Codepad). A harder problem (leetcode medium/hard) to be solved with js or ts. The problem involved string manipulation and pattern matching and could be solved in a variety of ways, including 2 pointers, dynamic programming, depth first search, recursion, etc. As I went along the interviewer added more criteria, so it was important to be able to be flexible.
      Answer question

      Question 6

      5. HIRING MANAGER INTERVEW (1 hour, Zoom). Two interviews in one: one part was a traditional interview describing my experience and why I wanted to work for Datadog and what I wanted to do at Datadog, and the other part was the presentation of a project that I had worked on in the past. They wanted to see that I had a sense of ownership of the project, that I had experience working across teams, that I was capable of leading a team and being the point person for implementing a technically challenging solution. They wanted to know how I navigated the difficulties of heading a project. I prepared a diagram ahead of time using excalidraw to explain the technical aspects and architecture to make things go a bit smoother.
      Answer question
      12

      Other Senior Software Engineer - Frontend interview reviews for Datadog

      Senior Frontend Developer Interview

      23 Nov 2025
      Anonymous interview candidate
      Lisbon, Lisbon District
      No offer
      Positive experience
      Average interview

      Application

      I interviewed at Datadog (Lisbon, Lisbon District)

      Interview

      3 phases: 1)HR screening 2)Leetcode exercises on call super acessible and the interviewer explained super well and answered my questions 3)On site interview where you have to describe how would you approach the development of a feature or fixing a major bug

      Interview questions [1]

      Question 1

      Leetcode standard exercise of ordering and filtering
      Answer question

      Senior Frontend Developer Interview

      13 Dec 2024
      Anonymous employee
      Valbonne
      Accepted offer
      Positive experience
      Difficult interview

      Application

      I applied through an employee referral. The process took 2 months. I interviewed at Datadog (Valbonne) in Oct 2024

      Interview

      The process is thorough and quite lengthy, but you’re well supported throughout. All interviews were conducted virtually and in English: - Recruiter Screen: An initial discussion with a recruiter to review your background and motivations. - Technical Algorithm Interview: Two algorithmic exercises on CoderPad, similar to what you might find on LeetCode. - React Coding Interview: A practical coding session on CoderPad, focused on React. - Advanced Algorithm Interview: A single, more challenging algorithmic problem, again on CoderPad. Comparable to harder exercises on LeetCode. - System Design Interview: Conducted on Excalidraw, this interview focused specifically on frontend architecture and design. - Experience and Values Interview: A one-hour session split into two parts: - 30 minutes to discuss a project you’ve worked on, diving into the technical details. - 30 minutes of behavioral questions to assess your alignment with company values. If you pass all these stages, the final step is the team match: You’ll have two interviews with different teams to learn about their work, ask questions, and ultimately decide which team you’d like to join.

      Interview questions [5]

      Question 1

      Determine the total number of repetitions of words in a paragraph.
      1 Answer

      Question 2

      Write a function which checks if a string matches a pattern without using Regexp.
      Answer question

      Question 3

      Create a React page that displays a table of real-time data. The table should support sorting by any column.
      Answer question

      Question 4

      Design the frontend architecture to filter and display real time logs (Live Tail view).
      Answer question

      Question 5

      Why do you want to work for Datadog? Tell me about a time you had a conflict at work. Imagine you’re working on a project that is experiencing numerous bugs in production. How would you approach this situation?
      Answer question
      2

      Senior Software Engineer, Frontend Interview

      26 Nov 2024
      Anonymous employee
      Accepted offer
      Positive experience
      Difficult interview

      Application

      I applied through a recruiter. The process took 2 months. I interviewed at Datadog in Oct 2024

      Interview

      I was first contacted on LinkedIn by a Tech Recruiter from Datadog’s New York office. The initial interview was straightforward—just what you’d expect. The recruiter introduced the company, explained their products, described what they’re looking for in candidates, and asked about my background, experience, and motivations. They also explained the next steps in the process. The second interview was a technical screening with a Senior Software Engineer. It started with a 10-minute discussion where I presented a technical project I had worked on, followed by solving two coding problems on CoderPad. The first problem was simple while the second was slightly more challenging. The interviewer was supportive and gave some hints, making it feel collaborative. Next, I got to choose between a take-home frontend project or a live React coding session. I chose the take-home project since I don't have much professional experience with React. You can use any framework or library for the project, as long as it doesn’t directly solve the problem for you. They suggest it will take 4–6 hours, but I found it required way more time (if you want to fully showcase your skills). It’s worth the effort to do your best though, as this is a great opportunity to demonstrate your expertise. After the take-home project, I had a System Design interview using Excalidraw conducted by another Senior Software Engineer. This was a typical System Design interview, but since I was applying for a frontend role, I focused mainly on the frontend part (including the key API endpoints) and treated the backend as a "black box." I was asked to create a high-level UI design for the problem and got follow-up questions throughout to explain my decisions and adjust my approach when needed. My advice: pay attention to frontend performance and always think from the user’s perspective. Also, if you’re not familiar with Datadog’s platform, spend some time exploring their features and interface before the interview—it can really help. Then came another coding interview, also on CoderPad, with a Senior Software Engineer. This one was less like a standard coding test and more product-focused. The initial question was fairly easy, but the follow-up questions made it more challenging, ending up at a medium difficulty level. I didn’t fully solve the last follow-up question in the hour but explained my approach clearly and showed how I would finish it. Having a complete solution is important, but it’s not the only thing they evaluate. In addition to your coding skills, they also look at how you approach problems, ask clarifying questions, explain your reasoning, and communicate your ideas. The last interview was a behavioral interview (Experience & Values) with an Engineering Manager. I had to deep-dive into a technical project I had worked on and explain my decisions in detail. After that, I answered behavioral questions about my past work experiences (similar to Amazon’s Leadership Principles). Preparing stories using the STAR method helped a lot. Finally, I got a call from the recruiter saying I had positive feedback and was moving to the team match call. This 30-minute call was with an Engineering Manager from a product team. It wasn’t technical or behavioral—it was more about introducing the team, explaining their work, and seeing if my goals aligned with theirs. It was also a good time to ask questions about the team, the product, the role, and the work culture. Overall, the interview process takes a lot of time and preparation, but the tech recruiters were very helpful, providing all the information I needed to prepare. They kept me updated and gave feedback quickly after each interview. The interviewers were friendly and made sure I felt comfortable. Most of the interviews felt more like conversations than tests, which made the whole process a lot more enjoyable.

      Interview questions [5]

      Question 1

      Technical screening interview: - Count word repetitions in a paragraph - DFS problem (sum of leaf nodes in a binary tree)
      Answer question

      Question 2

      Take-home project: - Load Monitoring Web App
      Answer question

      Question 3

      System Design interview: - Design an app that handles monitors
      Answer question

      Question 4

      Coding interview: - Pattern matching (without regex)
      Answer question

      Question 5

      Experience & Values interview: - Classic behavioural questions ("Tell me about a time where you...")
      Answer question