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Software Engineer II, Backend

Duolingo
Pittsburgh, PA Full Time
POSTED ON 12/11/2025 CLOSED ON 1/6/2026

What are the responsibilities and job description for the Software Engineer II, Backend position at Duolingo?

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.

Below you can find more information about the teams we're hiring for:

Test Scoring Team

The Test Scoring team builds the advanced administration and scoring algorithms behind the world’s most accurate, efficient English proficiency test: the Duolingo English Test. This mission-driven product has reshaped the industry and expanded access to higher education for thousands of students. On this highly cross-functional team, you’ll partner with AI researchers and psychometricians to refine our scoring algorithms, maintain core microservices, automate critical workflows, and create strong guardrails that let us innovate rapidly while safeguarding the integrity of DET scores.

:brain: You will...

  • Collaborate on software projects with product design and backend aspects
  • Develop, release, and maintain backend services and/or infrastructure
  • Lead individual project priorities, milestones, and ensure we're always shipping

:check: You have...

  • A Bachelor’s degree in Computer Science or related technical field
  • Strong competencies in data structures, algorithms, and software design
  • Experience programming in Java, Python, or Kotlin
  • Solid understanding of one or more database technologies

:star: Exceptional candidates will have...

  • Industry experience building high-traffic APIs using public cloud providers

We post a multi-level salary range for all of our roles.

This is not inclusive of the rest of our awesome portfolio that includes equity compensation and world-class benefits. Our salary ranges are the same for all US locations. Your recruiter can share more details about the range for a specific level during the hiring process. The actual salary within the range is determined by many factors including but not limited to, skills, experience, education, and internal equity.

Salary Range

$147,900—$240,400 USD

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

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 accommodations@duolingo.com.

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.

By applying for this position your data will be processed as per the Duolingo Applicant Privacy Notice.

Sign up for job alerts here.

Salary : $147,900 - $240,400

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