Senior iOS Software Engineer

Our mission at Duolingo is to develop the best education in the world and make it universally available. It’s a big mission, and that’s where you come in! At Duolingo, you’ll join a team that cares about finding innovative solutions to complex technical problems , running countless experiments (300+ at a time!) with our massive user base to make data-driven decisions, and educating our users and employees alike. You’ll have limitless learning opportunities, mentorship and collaboration with world-class minds, and a variety of projects with large scopes — while doing work that’s both fun and meaningful. Join our life-changing mission to develop education for our half a billion (and growing!) learners around the world. About the role Math Team As an iOS engineer on the Math team, you will help build the technology that changes how people around the world learn Math. The features that you ship will help learners to develop core math skills in a fun, engaging way. We’re looking for engineers who love building new products and features. Short Form Area: As an iOS engineer in the Short Form Area, you'll build features that make up the core of the learning experience on Duolingo. Our short-form lessons are where learners spend the majority of their time on the app, and our area's mission is to make these sessions more effective and engaging. You'll work on adding new exercises that support our learners in practicing skills like recall and production in bite-sized formats, as well as creating other ways to help learners build foundational skills in a new language. We're looking for engineers who are passionate about improving how we teach. Video Call Experience Team: The Video Call Experience team is responsible for both the technical foundation and product roadmap for Duolingo's Video Call product — a core feature that allows users to bridge the speaking listening gap in their language learning journey. You'll architect robust infrastructure while creating engaging user experiences, working closely with design and product partners. We're looking for engineers who champion solid system design and find excitement in working with cross-functional partners to make language learning more fun and accessible. :brain: You will... Collaborate on software projects with product design and backend aspects Develop, release, and maintain native iOS applications, primarily in Swift Mentor and set technical direction for junior engineers across the company :check: You have... A Bachelor’s degree in Computer Science or a related technical field A solid foundation in computer science with strong competencies in data structures, algorithms, and software design Programming experience in Swift :star: Exceptional candidates will have... Strong proficiency in Swift, with proven ability to build and maintain production-level applications Strong technical knowledge of iOS mobile application development for iPhone/iPad using Swift with Cocoa Touch and related frameworks Experience designing clean and maintainable APIs Experience with multithreaded programming Experience writing unit tests and testable code Knowledge of iOS SDK performance tools and optimization techniques 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. Salary Range: $177,700 $240,400 USD Take a peek at how we care for our employees' holistic well-being with our benefits here . 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 n ... (truncated, view full listing at source)