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

• 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- 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 the root cause and resolving ANRs, memory leaks, dropped frames, and complex crashes

• Worked on and shipped large scale Android applications

• Experience with crash observability tooling like Sentry and Android Vitals

• Expertise in Android tracing tooling like the AndroidX Tracing Library and Perfetto- Talent Matching reviews your resume and responses to application questions to determine the extent to which your qualifications match the job requirements selected for this role. These requirements and their desired weighting are established by our recruiters in collaboration with hiring managers

• All Talent Matching output is reviewed by our recruiting and hiring teams, who make the final decision on each application. Talent Matching does not automatically disposition any candidate or make hiring decisions