Senior Software Engineer, Full Stack

Our mission at Duolingo is to develop the best education in the world and make it universally available. It’s a big mission, and that’s where you come in!

At Duolingo, you’ll join a team that cares about finding innovative solutions to complex technical problems, running countless experiments (300+ at a time!) with our massive user base to make data-driven decisions, and educating our users and employees alike. You’ll have limitless learning opportunities, mentorship and collaboration with world-class minds, and a variety of projects with large scopes — while doing work that’s both fun and meaningful.

Join our life-changing mission to develop education for our half a billion (and growing!) learners around the world.

About the role

As a software engineer, you will work on a specific project critical to Duolingo’s needs, with opportunities to switch projects as we grow and evolve. We need our engineers to be versatile, display leadership skills, and be enthusiastic about tackling new problems across the full stack as we continue to innovate.

DET Test Scoring Team:

• As an engineer on the Test Scoring team for the Duolingo English Test, you will help advance the state of the art in language testing. You will work closely with AI researchers and assessment scientists to pioneer innovative and AI-driven ways to assess language ability while maintaining critical infrastructure and strengthening the test’s reliability. You will advance the team’s mission to lower barriers and increase opportunities for English language learners everywhere.

You will...

• Partner closely with engineers and AI researchers to develop innovative ways to assess language ability.


• Develop, release, and maintain web-based services and infrastructure.


• Define, own key test metrics, and advocate the best testing practices.

You have...

• Strong competencies in data structures, algorithms, and software design.


• Strong understanding of modern web development tools, knowledge of public cloud infrastructure (AWS, Google Cloud) , and CI/CD pipelines (Jenkins, Travis, GitLab).


• Organizational skills to design, plan, prioritize, drive, and successfully launch technical projects.


• Mentorship skills to bring along junior engineers.

Exceptional candidates will have...

• B.A./B.S. in Computer Science or a related field.


• Programming experience in Python; technical expertise in distributed systems, including microservices, databases, caching, and cloud services.


• Familiarity with test harnesses, measuring test effectiveness, effectively finding gaps in product code, and briefly presenting it to the community for further improvements.

We will do everything we can within reason to make sure that your interview takes place in an environment that fairly and accurately assesses your skills. If you need assistance or accommodation, please contact your recruiter.

Take a peek at how we care for our employees' holistic well-being with our benefits here.

Duolingo is proud to be an Equal Employment Opportunity employer. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics.

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