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# Senior iOS Engineer

- **Company:** Duolingo
- **Location:** Pittsburgh, PA, United States
- **Experience:** Expert
- **Salary:** $177,700.0 - $240,400.0
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), IOS Applications, Apple IOS, Unit Testing, Computer Programming, Data Structures, IOS SDK, Machine Learning, Software Engineering, Multithreading, Backend, Information Technology, Optimization Algorithms, Performance Monitor, Cocoa Touch
- **Published:** June 5, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=26f6ff6c877e5897

## About the Role

Do you have a Bachelor's degree?, * 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...

 * 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

## Description

Ads Team:

Duolingo's Monetization pillar builds the systems that fund our mission: from subscription packaging and advertising to ML-powered personalization and beyond. As a Senior iOS Engineer on Ads, you'll work on a product engineering team responsible for growing and scaling Duolingo's ads business: bringing high-quality ads that delight learners, fit seamlessly into our product experience, and meaningfully contribute to Duolingo's bottom line. The team will own the systems behind ad serving, mediation and demand, in-product ad formats and surfaces, and more. You'll work cross functionally with product, design, data science, machine learning, and ad operations.

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


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