Senior iOS Engineer, Application Stability & Performance

Duolingo(25 days ago)

HybridFull TimeSenior$177,700 - $240,400Engineering

About this role

An iOS Engineer on Duolingo's Client Platform team builds infrastructure and tooling to keep iOS development fast and efficient at scale. The role focuses on improving the stability and performance of the Learning app, integrating performance metrics into experiments, and driving architectural initiatives for the app's slowest parts. Candidates will work closely across the organization to support engineers, inform roadmaps, and ensure high-quality user experiences.

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Required Skills

Swift
iOS
Performance Measurement
Performance Optimization
Stability
Multithreading
Concurrency
Synchronization
Memory Management
ARC

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About Duolingo

duolingo.com

Duolingo is a popular language-learning platform that offers free, gamified lessons on web and mobile for dozens of languages. It uses short interactive exercises, spaced-repetition and data-driven personalization to build reading, writing, speaking and listening skills, and also provides complementary products like Duolingo for Schools, Duolingo ABC for kids, Stories/Podcasts, and the Duolingo English Test. The core service is ad-supported and free, with an optional Duolingo Plus subscription for an ad-free experience, offline access, and extra features; millions of learners worldwide use it for its engaging, science-backed, bite-sized approach.