Senior Android Engineer (Client Platform, Application Stability & Performance)

Duolingo; Pittsburgh (Allegheny County); On-site; USD 130,000 - 190,000; Full time

Benefits offered by this job

Health benefits

Mental health support

Fertility benefits

Parental leave

401(k) with match

Paid time off

Professional development stipend

Transit reimbursement

Lunch provided

Annual international retreat

Job summary

Duolingo is seeking an Android engineer for the Application Stability and Performance team to own the app's stability and performance for millions of learners on the Android platform. You will lead architectural fixes, develop tooling for crash/memory analysis, and ensure performance metrics inform experiment analyses.

You will collaborate with Client Platform and Product teams, mentor engineers, and drive engineering excellence in performance across the stack.

Qualifications

• 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.
• Worked on and shipped large scale Android applications.
• Strong problem-solving skills and a passion for tackling difficult challenges.
• Experience with crash observability tooling like Sentry and Android Vitals.
• Expertise in Android tracing tooling like the AndroidX Tracing Library and Perfetto.

Responsibilities

• Own stability and performance of the Duolingo Android app for millions of learners.
• Build tooling for crash and memory analysis used by other engineers.
• Own performance metrics feeding experiment analyses and surface regressions.
• Lead architectural initiatives to fix slowest parts of the app, from startup to critical learning flows.
• Own and evolve performance tooling with tracing, benchmarking, and regression detection.
• Bridge between Client Platform and Product feature teams to interpret performance data.
• Mentor engineers and foster a culture of engineering excellence around performance.

Skills

Kotlin

Coroutines

Jetpack Compose

Architecture patterns

Android performance

Debugging

Problem solving

Tools

Sentry

Android Vitals

AndroidX Tracing Library

Perfetto

Job description

• 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

Benefits

• Medical, dental, and vision for employees as well as eligible partners and dependents
• Mental health benefits such as therapy sessions and coaching to support you to be your best self
• Fertility benefits to support your family planning journey
• Fully paid parental and adoption leave
• Fully paid subscription to Care.com and paid backup days for dependents and your fur family
• 401(k) with generous match and immediate vesting
• 20 days of paid time off, with two additional weeks off for winter break
• First-time home buyer bonus (in Pittsburgh)
• Competitive salaries and equity
• Yearly stipend for professional development
• Transportation reimbursement for however you get to work
• Lunch prepared daily by our in-house chefs
• Annual international retreat for all full-time employees
• Monthly events celebrating our team and their amazing work
• On-site gym and massages
• Game room for taking brain breaks

• 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
• Worked on and shipped large scale Android applications
• Strong problem-solving skills and a passion for tackling difficult challenges
• Experience with crash observability tooling like Sentry and Android Vitals
• Expertise in Android tracing tooling like the AndroidX Tracing Library and Perfetto