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# Software Engineer II, Backend

- **Company:** Duolingo
- **Location:** New York, NY, United States
- **Experience:** Expert
- **Salary:** $153,000.0 - $207,000.0
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Databases, Data Structures, Python (Programming Language), Machine Learning, Prometheus, Software Engineering, Datadog, Grafana, Backend, Kotlin, Information Technology
- **Published:** July 12, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=3deba03ecdf26079

## About the Role

* A Bachelor's degree in Computer Science or a 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

 * Exceptional candidates will have...

 * Industry experience building high-traffic APIs using public cloud providers
 * Experience with industry observability technology, such as OpenTelemetry, Grafana, Prometheus, or DataDog.

## Description

As a backend engineer on the Content Infrastructure Team, you'll build features that make up the core backbone of the learning experience on Duolingo. Our short-form lessons are where learners spend the majority of their time on the app, and our team's mission is to build and update infrastructure to enable quick iteration and improve content quality in these sessions.

You'll work on scaling new exercise types that support our learners in practicing speaking or grammar in bite-sized formats, as well as re-architecting our infrastructure in other ways to help set our teams up for success in the future. We're looking for engineers who are passionate about designing scalable systems to help improve the quality of our short-form sessions!

Ads:

Duolingo's Monetization pillar builds the systems that fund our mission - from subscription packaging and advertising to ML-powered personalization. As a Senior iOS Engineer on the Ads team, you'll work on a product engineering team responsible for growing and scaling Duolingo's ads business: high-quality ads that delight learners, fit seamlessly into the product experience, and meaningfully contribute to our bottom line. The team owns ad serving, mediation and demand, in-product ad formats and surfaces, and more. You'll work cross-functionally with product, design, data science, machine learning, and ad operations.

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


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