Hiring: Senior/Software Engineer II, Backend Company: Duolingo Location: New York, NY Job Posted Time: 2026-09-15 11:02:14 Target Skills & Keywords : Android, Datadog, Design System, Grafana, Java, Kotlin, Machine Learning, OpenTelemetry, Prometheus, Python, iOS About the job Required Skills: •As a Backend 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. •As a member of the AI Tooling and Ecosystem Team, you will be responsible for developing and maintaining tools and services that power Duolingo's use of AI in the product. •Design systems for managing datasets, evaluating the performance of AI models, and building AI workflows. •Help shape how Duolingo builds features using AI, enabling teams to easily define quality metrics, combine human and AI feedback, and compare model performance across different use cases. Compensation: •$182,800 - $247,300 / year Interested candidates, please apply directly through the job posting on company's career page or try via AI auto apply on this platform. Don't miss this opportunity to join a forward-thinking team!