Senior Android Performance & Stability Engineer

Duolingo; York and North Yorkshire; On-site; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Medical coverage

Mental health support

Fertility benefits

Paid parental leave

Equity & salary

Job summary

Duolingo is seeking an Android engineer to own the stability and performance of the Android Learning app for millions of learners. You will lead architectural initiatives, evolve performance tooling, and serve as a bridge between Client Platform and product teams to ensure robust, scalable experiences.

You will mentor engineers, tackle tough performance challenges, and contribute to a culture of engineering excellence with a focus on memory, startup time, and smooth user experiences across

Qualifications

• 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.
• Experience identifying root causes and resolving ANRs, memory leaks, dropped frames, and complex crashes.

Responsibilities

• Own the stability and performance of the Duolingo Android app for millions of learners.
• 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.
• Serve as a bridge between Client Platform and Product feature teams, helping them act on performance data.
• Foster a culture of engineering excellence around performance and mentor engineers of all experience levels.

Skills

Kotlin

Coroutines

Jetpack Compose

Architecture patterns

Startup optimization

ANR debugging

Tools

Sentry

Perfetto

AndroidX Tracing Library

Android Vitals

Job description

Duolingo is seeking an Android engineer to own the stability and performance of the Android Learning app for millions of learners. You will lead architectural initiatives, evolve performance tooling, and serve as a bridge between Client Platform and product teams to ensure robust, scalable experiences.

You will mentor engineers, tackle tough performance challenges, and contribute to a culture of engineering excellence with a focus on memory, startup time, and smooth user experiences across