iOS Software Engineer (Senior/Staff)

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.

Note: This role is open to considering engineers across various levels (Senior or Staff). If moved forward, your recruiter will discuss in more details!

Below you can find more information about the teams we're hiring for: 

Longform Content Team (Learning R&D Area): 

• As an engineer in the long-form content team, you’ll build technology that breaks down language barriers and makes it truly fun to learn. You’ll work on engaging, immersive experiences such as stories, duoradio that enable learners to use their language skills in the real world. In addition, you’ll help ensure that this content is ready for learners of all levels across dozens of languages. We’re looking for engineers who are passionate about building new features to further our mission of making education freely available to everyone.

Monetization Area:

• As an iOS engineer in the Monetization Area, you will work on our premium subscriptions—Super Duolingo and Duolingo Max—the key revenue drivers behind our business. Your contributions will touch on packaging, pricing, and hooks for our subscriptions, and game mechanics such as Hearts and Gems. We're seeking engineers who are passionate about bottom-line business impact, and who bring fresh insights and a creative technical approach.
• The Monetization Area focuses on Duolingo's key business drivers—subscriptions, ads, and in-app purchases. Our area's goal is to build the best premium experiences for our learners while ensuring the sustainability and success of our business model. You will play an instrumental role in the strategic direction of Duolingo by developing and refining the methods that make our monetization efforts more effective and efficient.

Infrastructure Platform Area:

• As an iOS engineer on Client Architecture, you will develop the technologies which underpin every single feature built at Duolingo. You will play a key role in evolving our architectural building blocks and driving forward their adoption through technologies like code generation and static analysis. Moreover, you will directly contribute to larger cross-cutting initiatives which impact the organization as a whole, such as reducing costs associated with every active user.

Design Lab Team: 

Music Team:

• As an iOS engineer on the Music team, you will help build the technology that changes how people around the world learn Music. The features that you ship will help learners to develop core music skills like sight reading and ear training in a fun, engaging way. We’re looking for engineers who love building new products and features and bring fresh ideas about teaching Music on mobile devices.

  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

  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

  Exceptional candidates will have...

• A minimum of 5 years of programming experience in Swift
• 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

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 need assistance or accommodation, please contact your recruiter.

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.

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