Staff iOS Engineer, App Builds

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!

About the role:

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 at scale. We have several different teams you can join responsible for application performance, architecture, and build tooling and infrastructure.

 Client Builds and Infrastructure Team:

• As an engineer on the Client Builds and Infrastructure team you’ll be 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.

 You will...

• 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

 You have...

• 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

 Preferred candidates will have...

• 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