Katkat

Company

Duolingo interview questions

2 practice questions in the style of Duolingo's interviews, covering System Design, Coding & Algorithms.

Questions2

1 easy0 medium1 hard

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Duolingo interview questions by the numbers

Last updated

Katkat has 2 Duolingo interview questions. The largest topics are Coding & Algorithms (50%) and System Design (50%). By difficulty: 50% easy and 50% hard. The most common round is Technical Screen (100%). Frequent concepts include Dictionaries, Encoding, Hash Maps and Strings.

Topics

Difficulty

  • Easy50% · 1
  • Hard50% · 1

Interview rounds

  • Technical Screen100% · 2

Roles

  • Software Engineer100% · 2

Frequent concepts

  • Dictionaries50% · 1
  • Encoding50% · 1
  • Hash Maps50% · 1
  • Strings50% · 1

Showing 1–2 of 2 results

  • Design Animal Chess game classesHard

    This interview question evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer for Design Animal Chess game classes states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

    DuolingoSoftware EngineerSystem DesignTechnical Screen
  • Implement String Encryption and DecryptionEasy

    This problem tests your ability to manage character mapping and reverse lookups using dictionaries to perform basic string transformation and reconstruction.

    DuolingoSoftware EngineerCoding & AlgorithmsTechnical Screen

Duolingo interview experiences

All 9 →
  • Duolingo Software Engineer interview with multiple phone screens before the onsiteDuolingo · Software Engineer · Onsite · May 2026

    The process took much longer than I expected and didn't feel organized. I went through a standard recruiter screen, followed by several additional phone screens, before finally reaching an onsite. The recruiter and each later step made it seem as if things were moving forward, but the overall experience felt tedious and drawn out. By the time I reached the onsite, I was tired of the pacing and re…

  • Duolingo Software Engineer tree traversal and graph coding assessmentDuolingo · Software Engineer · HR Screen · Apr 2026

    After a conversation with a recruiter, I did a technical screening focused on a coding problem that felt very "standard" for interviews, something like a tree traversal. There was also a short follow-up about how I would improve the algorithm's efficiency. The interviewer kept the conversation moving. Although the core question wasn't unfamiliar, the optimization questions made me slow down and t…

  • Duolingo Product Manager: take-home feature design task and delayed rejectionDuolingo · Product Manager · Take-home Project · Feb 2026
    Rejected

    I went through an internship-style process where the first real step was a take-home design task focused on a Duolingo feature. It took a significant amount of time. It felt like something they expected me to work on from start to finish and turn into a polished presentation. After I finished, the follow-up dragged on. The process went silent for a while, and I didn't receive a rejection until mo…

  • Duolingo Product Manager interview: take-home app feature assignmentDuolingo · Product Manager · Take-home Project · Jan 2026
    Rejected

    The process began with a take-home assignment, and I didn't speak with anyone before submitting my work. I had only a few days to devise or reimagine a Duolingo app feature and create a slide deck. It took a lot of effort to get the deck to a presentable level. After I submitted it, the live rounds still felt as if the main goal was to collect ideas from candidates. The most jarring part wasn't t…

  • Duolingo Product Manager interview: Take-home feature proposal and forty-five-minute product roundsDuolingo · Product Manager · HR Screen · Jan 2026

    I started with an online application and then went through a recruiter step before meeting anyone live. After that, I completed a take-home product assignment. I had to choose a feature to add or improve in Duolingo and turn it into a short slide deck covering the problem, solution, success metrics, and MVP. It took a while, but the instructions were clear enough that I understood what they wante…

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