[Remote] Senior iOS Engineer, Application Stability & Performance

Note: The job is a remote job and is open to candidates in USA. Duolingo is on a mission to develop the best education in the world and make it universally available. They are seeking a Senior iOS Engineer to build vital infrastructure and tools that ensure the stability and performance of their Learning application across iOS and Android platforms.


Responsibilities

  • Help teams measure and understand their performance, as well as optimize existing features and functionality while evangelizing best practices
  • Support engineers and partners from across the organization as they use the performance metric we provide, and use these interactions to improve our roadmaps
  • Use and develop tools like Instruments to analyze the performance, resource usage, and behavior of the application to identify and resolve performance bottlenecks

Skills

  • Deep expertise in Swift
  • Proficiency in multithreading, concurrency, and synchronization primitives
  • Deep understanding of ARC and memory management in iOS
  • Proven experience in architecting and leading complex iOS projects at scale
  • Strong problem-solving skills and a passion for tackling difficult challenges
  • Experience using Instruments to diagnose complex performance issues

Company Overview

  • Duolingo is a language-learning education platform that offers 98 total courses across nearly 40 distinct languages. It was founded in 2011, and is headquartered in Pittsburgh, Pennsylvania, USA, with a workforce of 501-1000 employees. Its website is https://www.duolingo.com.

  • Company H1B Sponsorship

  • Duolingo has a track record of offering H1B sponsorships, with 41 in 2025, 46 in 2024, 36 in 2023, 19 in 2022, 14 in 2021, 17 in 2020. Please note that this does not guarantee sponsorship for this specific role.

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