<p>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!</p><p>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.</p><p>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!</p><hr><h2><strong>About the role:</strong></h2><p><span data-offset-key="5p1gv-0-0"><span data-text="true">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 </span></span><span id="popover-trigger-:r11:" class="chakra-text css-1j6t0d7"><span data-offset-key="5p1gv-1-0"><span data-text="true">efficient</span></span></span><span data-offset-key="5p1gv-2-0"><span data-text="true"> at scale. We have several different teams you can join </span></span><span id="popover-trigger-:r13:" class="chakra-text css-8zk7oi"><span data-offset-key="5p1gv-3-0"><span data-text="true">responsible for</span></span></span><span data-offset-key="5p1gv-4-0"><span data-text="true"> application performance, architecture, and build tooling and infrastructure.</span></span></p><p> </p><h3><strong> Client Builds and Infrastructure Team:</strong></h3><ul><li>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.</li></ul><p> </p><h3><strong><img style="max-width: 100%;" src="https://careers.duolingo.com/274c0c8ca00d7c576894.svg" alt="icon-brain-16px" width="17" data-is360="0"> </strong><strong>You will...</strong></h3><ul><li class="public-DraftStyleDefault-unorderedListItem public-DraftStyleDefault-reset public-DraftStyleDefault-depth0 public-DraftStyleDefault-listLTR" data-block="true" data-editor="cnq5b" data-offset-key="49v58-0-0"><div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="49v58-0-0"><span data-offset-key="49v58-0-0"><span data-text="true">Represent the team in architectural discussions and stakeholder conversations, serving as a bridge between Client Platform and Product feature teams</span></span></div></li><li class="public-DraftStyleDefault-unorderedListItem public-DraftStyleDefault-depth0 public-DraftStyleDefault-listLTR" data-block="true" data-editor="cnq5b" data-offset-key="c4ase-0-0"><div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="c4ase-0-0"><span data-offset-key="c4ase-0-0"><span data-text="true">Work within our Client Platform Infrastructure area to create and maintain the foundational building blocks of our application infrastructure</span></span></div></li><li class="public-DraftStyleDefault-unorderedListItem public-DraftStyleDefault-depth0 public-DraftStyleDefault-listLTR" data-block="true" data-editor="cnq5b" data-offset-key="3dvej-0-0"><div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="3dvej-0-0"><span data-offset-key="3dvej-0-0"><span data-text="true">Foster a culture of engineering excellence and mentor engineers of all experience levels</span></span></div></li><li class="public-DraftStyleDefault-unorderedListItem public-DraftStyleDefault-depth0 public-DraftStyleDefault-listLTR" data-block="true" data-editor="cnq5b" data-offset-key="dsqfo-0-0"><div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="dsqfo-0-0"><span data-offset-key="dsqfo-0-0"><span data-text="true">Explore, prototype, and implement prospective tools for scaling our infrastructure such as diving deep into Bazel migration, Tuist integration, or investigating new platform capabilities</span></span></div></li></ul><p> </p><h3><strong><img id="geom_inter_1726854542099_26_1" style="max-width: 100%;" src="https://careers.duolingo.com/464e534703b1d6feb15d.svg" alt="icon-check-16px" width="17" data-is360="0"> </strong><strong>You have...</strong></h3><ul><li class="public-DraftStyleDefault-unorderedListItem public-DraftStyleDefault-reset public-DraftStyleDefault-depth0 public-DraftStyleDefault-listLTR" data-block="true" data-editor="cnq5b" data-offset-key="fglfe-0-0"><div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="fglfe-0-0"><span data-offset-key="fglfe-0-0"><span data-text="true">6+ years of iOS software engineering experience, 1-2+ years developing scalable production software and an </span></span><span id="popover-trigger-:r17:" class="chakra-text css-1j6t0d7"><span data-offset-key="fglfe-1-0"><span data-text="true">excellent</span></span></span><span data-offset-key="fglfe-2-0"><span data-text="true"> command of engineering fundamentals</span></span></div></li><li class="public-DraftStyleDefault-unorderedListItem public-DraftStyleDefault-depth0 public-DraftStyleDefault-listLTR" data-block="true" data-editor="cnq5b" data-offset-key="467cl-0-0"><div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="467cl-0-0"><span data-offset-key="467cl-0-0"><span data-text="true">Deep expertise in Swift and concurrency primitives</span></span></div></li><li class="public-DraftStyleDefault-unorderedListItem public-DraftStyleDefault-depth0 public-DraftStyleDefault-listLTR" data-block="true" data-editor="cnq5b" data-offset-key="5cs89-0-0"><div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="5cs89-0-0"><span data-offset-key="5cs89-0-0"><span data-text="true">Proficiency in native iOS development using standard tools and frameworks</span></span></div></li><li class="public-DraftStyleDefault-unorderedListItem public-DraftStyleDefault-depth0 public-DraftStyleDefault-listLTR" data-block="true" data-editor="cnq5b" data-offset-key="fbqr-0-0"><div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="fbqr-0-0"><span data-offset-key="fbqr-0-0"><span data-text="true">Ability to relocate to New York, NY</span></span></div></li></ul><p> </p><h3><strong><img style="max-width: 100%;" src="https://careers.duolingo.com/d26c1c52534fdf7f9587.svg" alt="icon-star-16px" width="17" data-is360="0"> </strong><strong>Preferred candidates will have...</strong></h3><ul><li class="public-DraftStyleDefault-unorderedListItem public-DraftStyleDefault-reset public-DraftStyleDefault-depth0 public-DraftStyleDefault-listLTR" data-block="true" data-editor="cnq5b" data-offset-key="5eiip-0-0"><div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="5eiip-0-0"><span data-offset-key="5eiip-0-0"><span data-text="true">Knowledge of iOS SDK performance tools and optimization techniques</span></span></div></li><li class="public-DraftStyleDefault-unorderedListItem public-DraftStyleDefault-depth0 public-DraftStyleDefault-listLTR" data-block="true" data-editor="cnq5b" data-offset-key="85cvu-0-0"><div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="85cvu-0-0"><span data-offset-key="85cvu-0-0"><span data-text="true">Experience supporting either Bazel based-projects or large iOS/macOS projects</span></span></div></li><li class="public-DraftStyleDefault-unorderedListItem public-DraftStyleDefault-depth0 public-DraftStyleDefault-listLTR" data-block="true" data-editor="cnq5b" data-offset-key="ept2o-0-0"><div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="ept2o-0-0"><span data-offset-key="ept2o-0-0"><span data-text="true">Experience maintaining a high performance CI pipeline</span></span></div></li><li class="public-DraftStyleDefault-unorderedListItem public-DraftStyleDefault-depth0 public-DraftStyleDefault-listLTR" data-block="true" data-editor="cnq5b" data-offset-key="30pjk-0-0"><div class="public-DraftStyleDefault-block public-DraftStyleDefault-ltr" data-offset-key="30pjk-0-0"><span data-offset-key="30pjk-0-0"><span data-text="true">Deep </span></span><span id="popover-trigger-:r19:" class="chakra-text css-8zk7oi"><span data-offset-key="30pjk-1-0"><span data-text="true">understanding</span></span></span><span data-offset-key="30pjk-2-0"><span data-text="true"> of testing best practices</span></span></div></li></ul><p> </p><div class="content-pay-transparency"><div class="pay-input"><div class="description"><p><strong>We post a multi-level salary range for all of our roles.</strong></p><p><em>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. </em><em>The actual salary within the range is determined by many factors including but not limited to, skills, experience, education, and internal equity.</em></p></div><div class="title">Salary Range: </div><div class="pay-range"><span>$148,800</span><span class="divider">—</span><span>$274,600 USD</span></div></div></div><div class="content-conclusion"><p class="Z7ph2">Take a peek at how we care for our employees' holistic well-being with our benefits<a class="Z7ph2" href="https://careers.duolingo.com/#benefits"> here</a>.</p><p class="Z7ph2">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 <a class="Z7ph2" href="mailto:accommodations@duolingo.com" target="_blank" data-stringify-link="mailto:accommodations@duolingo.com" data-sk="tooltip_parent">accommodations@duolingo.com</a>.</p><p class="Z7ph2">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.</p><p class="Z7ph2">By applying for this position your data will be processed as per the<a class="Z7ph2" href="https://docs.google.com/document/d/e/2PACX-1vTX9GKeRMOMA9Vtm0vfGibrYPYz8ysl0Dg8KSXgj_PxeT5ChsdnNZZWtpxu4t7xillTPGnngnKCjIbV/pub"> Duolingo Applicant Privacy Notice</a>.</p></div>