Senior iOS Software Engineer

undefined ago • All levels • Mobile Development • $148,800 PA - $274,600 PA

Job Summary

Job Description

Our mission at Duolingo is to develop the best education in the world and make it universally available. At Duolingo, you’ll join a team that cares about finding innovative solutions to complex technical problems, running countless experiments 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. Join our life-changing mission to develop education for our half a billion (and growing!) learners around the world. The Ads team builds high-quality, user-friendly monetization features through Duolingo’s signature approach to design and learning. On this team, you will develop native ad experiences, real-time optimization systems, and infrastructure that powers millions of decisions per day. As an engineer working on one of Duolingo’s most impactful revenue streams, you can expect to move quickly, solve complex scaling challenges, and craft delightful solutions that balance business performance with learner satisfaction.
Must have:
  • 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
  • A Bachelor’s degree in Computer Science or a related technical field
  • A solid foundation in computer science
Good to 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

Job Details

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.

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

Ads Team:

The Ads team builds high-quality, user-friendly monetization features through Duolingo’s signature approach to design and learning. On this team, you will develop native ad experiences, real-time optimization systems, and infrastructure that powers millions of decisions per day. As an engineer working on one of Duolingo’s most impactful revenue streams, you can expect to move quickly, solve complex scaling challenges, and craft delightful solutions that balance business performance with learner satisfaction.

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

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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 accommodations@duolingo.com.

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.

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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:

$148,800—$274,600 USD

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About The Company

Duolingo is the world’s most popular way to learn a language. Our mission is to develop the best education in the world and make it universally available.


Founded in 2011 by Luis von Ahn and Severin Hacker, Duolingo is the most downloaded education app in the history of the App Store and in 2019 became the top-grossing education app worldwide. The app has been awarded Apple's iPhone App of the Year and Android's Best of the Best.


Learning a new language used to be expensive; we believe it should be free. Over 1.2 billion people are learning a second language and most of them are learning English to improve their lives.


Learning a new language is hard; we believe it can be fun. We use bite-sized lessons that feel like playing a game to keep our learners motivated. 


With over 500 million learners we have unprecedented data insights on how people learn. Our teams of language learning scientists, machine learning engineers, and AI experts use this data to constantly improve our effectiveness. We’re building a future in which the highest-quality education is accessible to all. 


Duolingo has raised US $138 million from investors including Union Square Ventures, Capital G (formerly Google Capital), NewView Capital, Kleiner Perkins Caufield & Byers, Drive Capital, Ashton Kutcher and Tim Ferriss.


Duolingo has been named to: BuiltIn's Best Places to Work (2023), Fast Company Best Workplaces for Innovators (2022), Fast Company 10 Most Innovative Education Company (2022), Best Machine Learning Startups for by Glassdoor (2020), Forbes' "Next Billion Dollar Startups" (2019), CNBC's Disruptor 50 (2018, 2019), Fortune's "Change the World" list (2019), TIME Magazine's Genius Companies (2018), Fast Company's "Most Innovative Companies" (2017, 2018, 2020), Inc.'s "Best Places to Work" (2018), Entrepreneur's "Top Company Cultures" (2018).

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