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Senior iOS Engineer, Builds Infrastructure

Duolingo

$148,800 - $274,600
Sep 30, 2025
New York, NY, US
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Duolingo needs to ensure its iOS development can continue to be fast and efficient at scale by building necessary infrastructure and tools.

Requirements

  • 6+ years of iOS software engineering experience
  • 1-2+ years developing scalable production software
  • Deep expertise in Swift and concurrency primitives
  • Proficiency in native iOS development using standard tools and frameworks
  • Knowledge of iOS SDK performance tools and optimization techniques
  • Experience supporting either Bazel based-projects or large iOS/macOS projects
  • Experience maintaining a high performance CI pipeline

Responsibilities

  • Evaluating and setting the direction for iOS builds, including explorations into Bazel, modularization strategies, and CI pipeline changes to optimize build times.
  • Creating and maintaining the foundational building blocks of our application infrastructure.
  • Exploring, prototyping, and implementing prospective tools for scaling infrastructure such as diving deep into Bazel migration, Tuist integration, or investigating new platform capabilities.
  • Representing the team in architectural discussions and stakeholder conversations.
  • Working within the Client Platform Infrastructure area.
  • Fostering a culture of engineering excellence.
  • Mentoring engineers of all experience levels.

Other

  • Ability to relocate to New York, NY
  • Serve as a bridge between Client Platform and Product feature teams
  • 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.
  • Take a peek at how we care for our employees' holistic well-being with our benefitshere.
  • 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 theDuolingo Applicant Privacy Notice.