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Senior Android Engineer, Client Platform - Application Stability and Performance at Duolingo · LumiJobs

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Duolingo· Posted 2026-08-25

Senior Android Engineer, Client Platform - Application Stability and Performance

New York, NYfull timeOn Site

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senior

$183k–$247k

H1B: yes

Duolingo Senior Android Engineer on Duolingo's Application Stability and Performance team responsible for app stability and performance for millions of users. Lead architectural initiatives and develop performance tooling to detect regressions and optimize app metrics.

Responsibilities

As an Android engineer on our Application Stability and Performance team you’ll own the stability and performance of the Duolingo Android Learning app for millions of learners.
This team builds the tooling other engineers depend on to keep the app performant like AI agent driven crash and memory analysis, coroutine system tracing, and Macrobenchmark suites that catch regressions before they ship. You'll also own the performance metrics that feed into our experiment analyses and help ensure hundreds of concurrent experiments surface any performance issues or regressions.
Lead architectural initiatives to fix the slowest parts of the app, from startup to critical learning flows
Own and evolve our performance tooling with tracing, benchmarking, and automated regression detection
Serve as a bridge between Client Platform and Product feature teams, helping them understand and act on the performance data we provide
Foster a culture of engineering excellence around performance and mentor engineers of all experience levels
Worked on and shipped large scale Android applications
Experience identifying the root cause and resolving ANRs, memory leaks, dropped frames, and complex crashes
Strong Kotlin skills and deep familiarity with coroutines, Jetpack Compose, and modern architecture patterns
Experience optimizing startup time, memory, and network usage for low-memory devices
Strong problem-solving skills and a passion for tackling difficult challenges
⭐ Exceptional candidates will have...

Qualification

Experience resolving ANRsExperience optimizing startup time

Required

Experience shipping large scale Android applications
Experience resolving ANRs, memory leaks, dropped frames, and complex crashes
Strong Kotlin skills with familiarity in coroutines, Jetpack Compose, and modern architecture
Experience optimizing startup time, memory, and network usage for low-memory devices

Preferred

Expertise in Android tracing tooling like AndroidX Tracing Library and Perfetto
Experience with crash observability tooling like Sentry and Android Vitals

Benefits

Equity/RSU

Company

Duolingo

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Source: greenhouse

Active within the past hour

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Experience resolving ANRsExperience optimizing startup time

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