• Design and build core SDK and library features used by Speedtest clients and third-party partners • Develop network testing functionality using Kotlin and Kotlin Multiplatform • Build and maintain performance-critical components using C++ • Maintain and support legacy SDK products built in Java • Design clean, well-structured and easy-to-use APIs for both SDK and application use • Work close to Android platforms, device hardware and, in some cases, embedded environments • Ensure high levels of reliability, flexibility, portability and code reuse • Implement analytics and telemetry to monitor performance and behavior in production • Write unit, integration, load and stress tests • Debug and troubleshoot complex, multi-layer and multi-platform issues • Collaborate on architecture and technical decisions across SDK, frontend, backend and distributed server teams • Contribute to documentation, developer support and long-term maintenance of SDKs • Participate in code reviews and continuous improvement of engineering practices

• Build and evolve mobile instrumentation SDKs for iOS (Swift / Obj-C) and Android (Kotlin / Java), prioritizing performance, stability, and a great developer experience. • Design and ship SDK features such as session tracking, crash reporting, sampling strategies, automatic context propagation, and OpenTelemetry integrations. • Own projects end-to-end. • Break large, ambiguous problems into incremental deliverables: design modular solutions, ship MVPs, gather feedback, iterate quickly. • Ensure quality: automated tests, CI, documentation, and smooth, backwards-compatible upgrade paths. • Collaborate cross-functionally with backend, frontend, product, and solutions engineering to ensure cohesive end-to-end observability workflows. • Engage with the open-source community: review PRs, discuss design proposals, and help guide external contributors. • Mentor teammates, participate in technical design discussions and help shape the mobile observability roadmap.

• Be part of an agile, cross functional team; • Work closely with the all development teams responsible for the mobile applications and their backend; • Be proactive, hands on, involved in tasks and related communication; • Participate and lead the design, development, maintenance, and every part of the delivery process of our Android apps; • Help drive the technical competency in the Android engineering area; • Have shared ownership of our product vision.

• Work with a fast-growing team to build and scale impactful products • Build smooth, stable, and elegant Android applications using Kotlin and modern Android APIs • Own features end to end, from inception and design through implementation and launch • Collaborate cross-functionally with Product Designers, Product Managers, Backend Engineers, and Data teams • Work with Kotlin, Android SDK, Jetpack Compose, MVVM, Coroutines & Flow (preferred) or RxJava, and Retrofit & Room