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      Senior Software Engineer Interview

      Jul 27, 2021
      Anonymous Interview Candidate
      No offer
      Negative experience
      Average interview

      Application

      I applied through a recruiter. The process took 4 weeks. I interviewed at Twilio in Jul 2021

      Interview

      Yikes. From beginning to end, this was a disaster. The first recruiter I talked to essentially did a manual keyword scan of my resume on the call ("but can you do REST?") - call ended after 15 minutes and I wasn't allowed time to ask questions. After that, I was asked to do a screen via Hackerrank. I rewrote the solution 3 times in the allotted time. I'm not a frequent Hackerrank user and it wasn't clear that I would be judged using an arbitrary time constraint. I did finish and was asked to talk to a hiring manager. The conversation with the HM was pleasant enough, some behavioral questions and time for me to ask questions as well, even though the HM cut the meeting 15 minutes short. Then I had a virtual onsite loop, split over 2 days. The first day, I spoke to a recruiter who told me I wasn't allowed to look anything up during the interview. However, the first interviewer on the loop encouraged me to look things up as much as I needed. The interviewer also expected me to have an IDE set up to use for the interview, which nobody had briefed me about. I ended up using an ad hoc Hackerrank portal to complete the problem, but we kept getting a Time Limit Exceeded error. I had to switch to my secondary language because the task was nearly impossible to complete in time in my preferred language. But the interviewer and shadow were great! Really made me feel comfortable, and they thanked me for the time spent. Loop resumed the next day. A junior developer asked me to implement a LRU cache. It was clear the interviewer didn't understand the question very well. When I said at one point we needed a queue to evict entries in a FIFO manner, the interviewer said "you said first, but you *actually* meant last." Yikes! We went around in circles because the interviewer was probing for a specific data structure. However, this was unproductive and felt like I was being berated. After that, I had a systems design problem. This section also had a shadow. The shadow drove as much as the main interviewer. As a woman with workplace trauma, having 2 strange dudes jerk me through the design process feels pretty degrading and triggering. I wasn't able to finish any one part because they kept insisting I design something else, and then they kept picking at the parts I hadn't finished. This system would require, like, 7 microservices to work - it almost wasn't feasible to design in the time allotted. Last was an interview with the BR, who asked about previous experience. Went fine! I felt pretty beaten up after all of that and wasn't expecting an offer. However, a recruiter got in touch with me to schedule a meeting with the hiring skip-level. The conversation with the skip-level was fine. I asked questions and he answered. I probably asked about internal culture, mental health support, etc. I was surprised to find out that, for whatever reason, after that last conversation, Twilio decided to pass on me. I didn't get any specific feedback as to why, but I guess it had to do with something I brought up. I can't think of anything offensive I could have possibly said. What a harrowing experience, start to finish. The organizational dysfunction is apparent even when interviewing remotely. Absolutely do not recommend - not worth your time.

      Interview questions [1]

      Question 1

      Implement an API for JSON data
      Answer question
      14

      Other Senior Software Engineer Interview Reviews for Twilio

      Senior Software Engineer Interview

      Aug 21, 2025
      Anonymous employee
      Accepted offer
      Positive experience
      Easy interview

      Application

      I applied online. I interviewed at Twilio

      Interview

      Three-stage process: recruiter screening, a test task and on-site interview. Both test task and the on-site were simple and straightforward, with focus on practical skills. On-site included the prospective team lead, VP and a team lead from another team in the same location.

      Interview questions [1]

      Question 1

      - What data structure would you use for variable-length phone number prefixes?
      Answer question

      Senior Software Engineer Interview

      Feb 14, 2025
      Anonymous Interview Candidate
      No offer
      Negative experience
      Average interview

      Application

      I applied online. I interviewed at Twilio in Jan 2025

      Interview

      Interviewed for the L2 role on the Channels team. I did the online assessment (~3 hours), passed it, then was notified saying they filled the role and were no longer considering me. No referral to another role either. Long story short, don't let this awful company waste your time. 2 algo problems (listed below), 1 easy SQL problem, 1 easy API data retrieval problem, and 2 trivial multiple choice problems.

      Interview questions [2]

      Question 1

      Similar to LC1664 - Ways to Make a Fair Array except you don't need to count the number of ways to make it fair, you just have to find the 1 index to remove to make it fair.
      Answer question

      Question 2

      If you google Hackerrank Approximate Matching you can find some material on it. Involves calculating a text score for substrings of a word based on a given prefix and suffix.
      Answer question
      2

      Senior Software Engineer Interview

      Sep 29, 2023
      Anonymous Interview Candidate
      Madrid
      No offer
      Positive experience
      Difficult interview

      Application

      I applied online. The process took 4 weeks. I interviewed at Twilio (Madrid) in Sep 2023

      Interview

      I applied on the website (redirected from LinkedIn) and after a few days I was contacted by the recruitment team and an initial short call was arranged. After this call, I was given a HackerRank test to complete, which consisted of 3 multiple choice questions and 2 coding exercises. My technical assessment was reviewed and I was told that I was approved and the next interviews were scheduled. I then had 3 interviews together (but on different days with different interviewers): Coding, System Design and Behavioural. Note that one interview doesn't eliminate you from the process, but a final result is expected as a combination of all the interviews. A few days after the interviews, I had another call with the recruitment team to get the final feedback, and in my case, unfortunately, the recruiter told me that they wouldn't be proceeding with an offer for me. I would just like to add that everyone was very friendly throughout the process.

      Interview questions [1]

      Question 1

      System design: "Design a photo upload/album printing application"
      Answer question
      3

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