IOS Engineer, App Builds

Staff iOS Engineer, App Builds –
Duolingo for Schools

Our mission at Duolingo is to develop the best education in the world and make it universally available. We’re the world’s most popular learning app, offering English proficiency testing and bringing new subjects like Math and Music into the app. We are passionate about educating our users, making fact‑based decisions, and finding innovative solutions to complex problems. We offer meaningful work, limitless learning opportunities, and collaboration with world‑class minds.

As an iOS engineer in our Client Platform Infrastructure Area you will build all the necessary infrastructure and tools to ensure Duolingo’s iOS development can remain fast and efficient  can join one of several teams focused on application performance, architecture, and build tooling.

• Evaluate and set the direction for iOS builds, exploring Bazel, modularization strategies, and CI pipeline changes to optimize build times across 70+ developers.

• Represent the team in architectural discussions and stakeholder conversations, serving as a bridge between Client Platform and product feature teams.
• Work within our Client Platform Infrastructure area to create and maintain foundational building blocks of our application infrastructure.
• Foster a culture of engineering excellence and mentor engineers of all experience levels.
• Explore, prototype, and implement prospective tools for scaling our infrastructure, such as deep diving into Bazel migration, Tuist integration, or investigating new platform capabilities.

• 6+ years of iOS software engineering experience, 1–2+ years developing scalable production software, and a solid command of engineering fundamentals.
• Deep expertise in Swift and concurrency primitives.
• Proficiency in native iOS development using standard tools and frameworks.
• Ability to relocate to New York, NY.

• Knowledge of iOS SDK performance tools and optimization techniques.
• Experience supporting Bazel‑based projects or large iOS/macOS projects.
• Experience maintaining a high‑performance CI pipeline.
• Deep understanding of testing best practices.

$177,700—$240,400 USD

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 U.S. 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.

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

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 any other legally protected characteristics.

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