Process
Mix of ML interviews and standard SWE interviews.
ML interviews were more chill; the focus was on describing high-level algorithms or tweaks.
The SWE tests were standard LeetCode medium and/or hard problems.
Questions
How would you design a recommendation system?
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Interview Statistics
The following metrics were computed from 1 interview experience for the Duolingo Machine Learning Interview role in United States.
Success Rate
0%
Pass Rate
Duolingo's interview process for their Machine Learning Interview roles in the United States is extremely selective, failing the vast majority of engineers.
Experience Rating
Positive100%
Neutral0%
Negative0%
Candidates reported having very good feelings for Duolingo's Machine Learning Interview interview process in United States.
Duolingo Work Experiences
5.0
Amazing culture. Hopefully that stays
Software Engineer • Current Employee
March 20, 2026
Pros: - Great culture and emphasis on collaboration and having fun.
- Made several lifelong friends here.
- Post-IPO stock gains were great while they lasted.
- The CEO is smart and still in 'founder mode'.
- It's fun to work on problems in education for a brand that people love.
Cons: - Compensation is 80% of what you would get at Google or Facebook. The company is relying on its feel-good mission and stock growth to make up for the remaining 20%. The recent stock price crash has made this worse. HR had better act soon before the best talent leaves.
- We're hiring more people, but the scope of work for each person seems to be getting smaller over time.
- Pittsburgh is a great city to live in, but it limits your career opportunities if you want to switch companies.
3.0
A fine place to work as a contractor
Test Developer • Former Employee
Pittsburgh, Pennsylvania, United States
November 4, 2024
Pros: Good flexibility and interesting work.
Cons: Working as a contractor is very inconsistent with little room for growth.
5.0
Good company for freelancers
Manual QA Tester • Current Employee
Pittsburgh, Pennsylvania, United States
November 9, 2023
Pros: Friendly, flexible, paying on time
Cons: Can give 10 days' notice before the contract is over.
- 5.0Amazing culture. Hopefully that staysSoftware Engineer • Current EmployeeMarch 20, 2026Pros: - Great culture and emphasis on collaboration and having fun. - Made several lifelong friends here. - Post-IPO stock gains were great while they lasted. - The CEO is smart and still in 'founder mode'. - It's fun to work on problems in education for a brand that people love.Cons: - Compensation is 80% of what you would get at Google or Facebook. The company is relying on its feel-good mission and stock growth to make up for the remaining 20%. The recent stock price crash has made this worse. HR had better act soon before the best talent leaves. - We're hiring more people, but the scope of work for each person seems to be getting smaller over time. - Pittsburgh is a great city to live in, but it limits your career opportunities if you want to switch companies.
- 3.0A fine place to work as a contractorTest Developer • Former EmployeePittsburgh, Pennsylvania, United StatesNovember 4, 2024Pros: Good flexibility and interesting work.Cons: Working as a contractor is very inconsistent with little room for growth.
- 5.0Good company for freelancersManual QA Tester • Current EmployeePittsburgh, Pennsylvania, United StatesNovember 9, 2023Pros: Friendly, flexible, paying on timeCons: Can give 10 days' notice before the contract is over.
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