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      Software Engineer Interview

      Mar 27, 2021
      Anonymous Interview Candidate
      London, England
      No offer
      Negative experience
      Average interview

      Application

      I applied online. The process took 1 day. I interviewed at Cloudflare (London, England) in Mar 2021

      Interview

      Initially got a HackerRank Q&A for screening - passed this and moved onto a technical pairing exercise. The exercise went okay, an interesting question relating to packet/data replication in a distributed system. I was allowed to Google anything whilst attempting the problem. The hiring/recruiters are all incredibly helpful and friendly, that said the interviewer didn't seem very interested and sounded strapped for time. It felt rushed, we started the interview they asked if I had any questions and we drove straight into the coding exercise. Also, it was extremely difficult to concentrate as the interviewer didn't mute their mic so I was overloaded with sounds of water taps & waterbottles being emptied and whatever else was going on.... They did provide a good chunk of help but generally seemed disinterested and was clearly engaged in something else. Kind of felt more like a do work, ask for a review, do work, ask for a review process and it was hard to establish a mutual interest/collaboration on the task. I think half the time they were not paying attention. Thankfully I found the interview question quite interesting otherwise I probably would have cut the interview short and left. In general I'm still a fan of Cloudflare and the product itself. Most of the people you interact with are really nice and the work definitely sounds interesting. That said, I would probably avoid this place if you notice any red flags during the interview process - it doesn't bode well for the future work life balance or potential team dynamic of what you could be joining.

      Interview questions [4]

      Question 1

      What's the difference between a B and B+ Tree
      Answer question

      Question 2

      What's the difference between an LSM Tree vs B+ Tree
      Answer question

      Question 3

      How do you debug network/process/socket/low level issues on a Linux machine
      Answer question

      Question 4

      How do you handle data retention/consistency if a data store were to crash whilst receiving traffic
      Answer question
      11

      Other Software Engineer Interview Reviews for Cloudflare

      Software Engineer Interview

      Mar 28, 2026
      Anonymous Interview Candidate
      Austin, TX
      No offer
      Positive experience
      Difficult interview

      Application

      I applied through other source. I interviewed at Cloudflare (Austin, TX)

      Interview

      screening was not leetcode style problem, in loop round they asked me to implement problem which i was able to do it within time, system design round was conversational. amazing company to interview with. learned lot of things about them along the way

      Interview questions [1]

      Question 1

      data structure algorithms problem, and standard behavioral questions.
      Answer question
      1

      Software Engineer Interview

      Apr 8, 2026
      Anonymous Interview Candidate
      Austin, TX
      Declined offer
      Positive experience
      Difficult interview

      Application

      I applied online. I interviewed at Cloudflare (Austin, TX) in Mar 2026

      Interview

      Started with a 30-minute conversation with the hiring manager. He was amazing, very friendly, and the questions were mostly resume-based. The next round was a 1-hr TPS interview with an engineering manager. It was a HackerRank-style question (not typical LeetCode), but practicing LeetCode definitely helped in choosing the right data structures. After that, I had a conversation with the recruiter to discuss salary, location, next steps, etc. The interview loop consisted of 5 rounds: 30 mins: Culture fit (behavioral questions), 45 mins: PM interview (behavioral, focused on collaboration with PMs), 45 mins: Debugging round (debugging a working system - fairly easy), 1 hour: System design (medium to hard), 45 mins: AI-assisted coding round Overall, all the interviewers were great to interact with and very supportive throughout the process. The AI-assisted round was similar to debugging, but they expected me to “vibe-code” using AI to identify issues and fix bugs or add features. After clearing these rounds, the final steps included an office visit and a 15-minute call with a CXO.

      Interview questions [1]

      Question 1

      Tell me about a project you worked on recently and what were the challenges? Tell me about a time you made a mistake or failed. Why Cloudflare and why this team? How do you approach building a feature when you don't fully understand user needs?
      Answer question
      1

      Software Engineer Interview

      Apr 16, 2026
      Anonymous Interview Candidate
      Austin, TX
      No offer
      Negative experience
      Average interview

      Application

      I applied online. The process took 2 months. I interviewed at Cloudflare (Austin, TX) in Mar 2026

      Interview

      So the interview process involved 7 interviews and it would’ve been 8 (excluding office tour and recruiter calls) if they went through with the last round but the recruiter had a slick way of saying it’s 4 rounds with the 3rd being a loop of 5 interviews. The first interview is with a hiring manager call which went well. Then there was a live coding round where they asked me to build a battleship game which was pretty average in terms of difficulty. Then we went into the loop round with an orange cloud interview(behavioural), debugging, system design, product manager and another hiring manager interview where there was an AI coding challenge where you use prompts to fix bugs in a project or an environment that you’re not familiar with (which they didn’t mention earlier). After the loop round they tell me that the team feedback was positive so they will select me for a final call which will be with one of the two cofounders or senior executives. Before setting that call up they invited me for an Austin office tour which went great too. Then I get a call from the recruiter saying that the company is evolving so they are doing an exercise to re-evaluate the roles to see which to keep and which to cancel and this exercise would take a minimum of 2 weeks. After 3 weeks, the recruiter comes back and says “after reevaluating the role, the team went in a different direction for the role”. A TOTAL waste of time. The interviewers were actually nice and friendly and the recruiter was pretty responsive too but it looks to me like it’s a leadership decision but why waste people’s time and do the interviews before doing the exercises or reevaluations.