Senior iOS Engineer, Application Stability & Performance jobs in United States
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Duolingo · 20 hours ago

Senior iOS Engineer, Application Stability & Performance

positionUnited States
timeFull-time
remoteRemote
senioritySenior Level
money$178K/yr - $240K/yr

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.

E-LearningEducationLanguage LearningMobile Apps
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Comp. & Benefits
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H1B Sponsor Likelynote

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

Qualification

SwiftMultithreadingMemory managementPerformance optimizationInstrumentsProblem-solving

Required

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

Preferred

Experience using Instruments to diagnose complex performance issues

Benefits

Equity compensation
World-class benefits

Company

Duolingo

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Glassdoor3.9
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Duolingo is a language-learning education platform that offers 98 total courses across nearly 40 distinct languages.
dateFounded in 2011
location
Pittsburgh, Pennsylvania, USA
people-size501-1000 employees
web-link
https://www.duolingo.com

H1B Sponsorship

Duolingo has a track record of offering H1B sponsorships. Please note that this does not guarantee sponsorship for this specific role. Below presents additional info for your reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (41)
2024 (46)
2023 (36)
2022 (19)
2021 (14)
2020 (17)

Funding

Current Stage
Public Company
Total Funding
$183.3M
Key Investors
General AtlanticCapitalGDrive Capital
2021-07-28IPO
2020-11-18Series H· $35M
2020-04-14Series G· $10M

Leadership Team

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Luis von Ahn
CEO, co-Founder & Board Member
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Severin Hacker
CTO & Cofounder
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Recent News

Benzinga.com
16 Analysts Assess Duolingo: What You Need To Know
2026-01-09
PocketGamer.biz
"I admire anyone who manages to successfully release games with heart and personality"
2026-01-09
Benzinga.com
Duolingo Stock Jumps After Bank of America Says It's More Than A Language App
2026-01-06
Company data provided by crunchbase