Senior iOS Engineer, App Builds

Senior 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. But we’ve got more left to do — and that’s where you come in! Duolingo is the world’s most popular learning app. Beyond our core learning product, we also offer English proficiency testing with the Duolingo English Test, and are bringing new subjects into the Duolingo app, where people can develop their Math and Music skills.

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. Come brighten your life and over half a billion more!

As an iOS engineer in our Client Platform Infrastructure Area you will have the opportunity to build all the necessary infrastructure and tools to ensure Duolingo’s iOS development can continue to be fast and efficient  will join one of several different teams responsible for application performance, architecture, and build tooling and infrastructure.

• Responsible for evaluating and setting the direction for our iOS builds. This includes explorations into Bazel, modularization strategies, and CI pipeline changes to optimize build times across 70+ iOS 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 the 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 diving deep 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 an excellent 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 either Bazel based‑projects or large iOS/macOS projects.
• Experience maintaining a high performance CI pipeline.
• Deep understanding of testing best practices.

Take a peek at how we care for our employees’ holistic well‑being.

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 other applicable legally protected characteristics.

By applying for this position your data will be processed as per the Duolingo Applicant Privacy Notice.

$148,800—$274,600 USD

Mid‑Senior level

Full-time

Engineering and Information Technology

Education