Responsibilities
- Collaborate on software projects with product, design, and backend teams.
- Develop, release, and maintain native iOS applications primarily in Swift.
- Mentor junior engineers and set technical direction across the company.
- Develop and refine monetization methods for subscriptions, ads, and in-app purchases while working cross-functionally with product, design, data science, machine learning, and ad operations.
Requirements
- Bachelor’s degree in Computer Science or a related technical field.
- Strong foundation in computer science, including data structures, algorithms, and software design.
- Programming experience in Swift.
- Strong proficiency in Swift and the ability to build and maintain production-level applications is preferred.
- Strong technical knowledge of iOS mobile application development for iPhone and iPad using Swift, Cocoa Touch, and related frameworks is preferred.
- Experience designing clean and maintainable APIs, multithreaded programming, unit testing, testable code, and iOS SDK performance optimization is preferred.
Tech Stack
Categories
About Duolingo
Duolingo is the most downloaded education app in the history of the App Store. Our mission is to develop the best education in the world and make it universally available. Learning a new language is hard, but staying motivated is often the hardest part. That’s why we use fun, bite-sized, game-like lessons designed to keep you engaged and to drive real learning outcomes. Our approach is grounded in efficacy: we continuously test and improve our methods to ensure learners make meaningful progress. We also believe in democratizing education by offering an effective, high-quality free product. Developing a great free product is essential to our mission, ensuring that anyone with a smartphone can access learning that works. When it comes to utilizing AI tools, we have a golden rule: we use it when it clearly improves outcomes for learners. We don’t use it as a shortcut or a replacement for people, but as a tool to enhance learning experiences and efficacy. Duolingo has been named to: Fast Company’s Most Innovative Education Company (2026, 2022), Apple Design Award (2023), TIME100 Most Influential Companies (2023), Fast Company Best Workplaces for Innovators (2022), among others.