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DuolingoDuolingoNew York, NY

Software Engineer II, Backend

Backend engineer building scalable infrastructure for Duolingo's short-form language lessons and ads systems. Requires CS bachelor's, strong algorithms/data structures skills, and experience in Java/Python/Kotlin.

153k – 207k
On-siteBackend Engineering

About the role

Content Infrastructure / Ads Backend Engineer

Responsibilities

  • Build features that form the core backbone of the learning experience on Duolingo, focusing on short-form lessons where learners spend the majority of their time.
  • Scale new exercise types supporting speaking or grammar practice in bite-sized formats.
  • Re-architect infrastructure to enable quick iteration, improve content quality, and set teams up for future success.
  • Design scalable systems to enhance the quality of short-form sessions.
  • Collaborate on software projects involving product, design, and backend aspects.
  • Develop, release, and maintain backend services and/or infrastructure.
  • Lead individual project priorities, milestones, and ensure continuous shipping.

Requirements

  • 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.

Nice-to-Haves

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

Skills

JavaPythonKotlinData StructuresAlgorithmsSoftware DesignDatabasesAPIsOpenTelemetryGrafanaPrometheusDatadog

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