Senior Android Engineer, Client Platform - Application Stability and Performance

Duolingo; New York (NY); On-site; USD 183,000 - 247,000; Full time

Job summary

Duolingo is seeking an Android engineer on the Application Stability and Performance team to own the stability and performance of the Android Learning app for millions of learners. You will lead architectural initiatives, develop performance tooling, and collaborate across teams to surface issues and drive improvements.

The role emphasizes strong Kotlin skills, coroutines, Jetpack Compose, and modern architecture patterns, with a focus on reducing startup time and resource usage on devices with

Qualifications

• Shipped large-scale Android apps.
• Root-cause ANR, memory leaks and crashes.
• Strong Kotlin and modern architecture skills.
• Startup time, memory and network optimizations.
• Problem-solving mindset and collaboration.

Responsibilities

• Lead architectural initiatives to fix the slowest parts of the app, from startup to critical learning flows.
• Own and evolve performance tooling with tracing, benchmarking, and automated regression detection.
• Bridge Client Platform and Product feature teams to act on performance data.
• Mentor engineers and foster a culture of engineering excellence around performance.

Skills

Kotlin

Coroutines

Jetpack Compose

Architecture patterns

ANR debugging

Memory management

Performance optimization

Tools

AndroidX Tracing Library

Perfetto

Sentry

Android Vitals

Job description

Our mission at Duolingo is to develop the best education in the world and make it universally available. It’s a big mission, and that’s where you come in!

At Duolingo, you’ll join a team that cares about finding innovative solutions to complex technical problems, running countless experiments (300+ at a time!) with our massive user base to make data-driven decisions, and educating our users and employees alike. You’ll have limitless learning opportunities, mentorship and collaboration with world-class minds, and a variety of projects with large scopes — while doing work that’s both fun and meaningful.

Join our life-changing mission to develop education for our half a billion (and growing!) learners around the world.

About The Role

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.

You will

• 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

You have

• 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

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

Salary Range

$182,800—$247,300 USD

Benefits:

Take a peek at how we care for our employees' holistic well-being with our benefits here.

Accommodations:

We will do everything we can within reason to make sure that your interview takes place in an environment that fairly and accurately assesses your skills. If you need assistance or accommodation, please contact [e-mail].

Equal Employment Opportunity:

Duolingo is proud to be an Equal Employment Opportunity employer. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics.

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