Software Engineer (Mobile SDK, Android)

November 4, 2026

Senior

Madrid, Spain

Indeed

Description

The company is looking for a Senior Android Engineer to take ownership of Android SDKs for real-world network measurement, including the CQoE SDK and the Speedtest SDK used by carriers and external developers. The work spans Kotlin/Java, the JNI/NDK boundary, and a shared C++ measurement engine used across Android, iOS, and embedded targets. The role covers feature design, testing, documentation, deployment, and end-to-end delivery of changes on millions of devices.

Responsibilities

Design, implement, and maintain network measurement features in the CQoE and Speedtest Android SDKs, including implementation, testing, documentation, deployment, and development support
Work across the JNI/NDK boundary into the shared C++ measurement engine used across Android, iOS, and embedded targets by debugging native code and contributing to it directly
Bring AI-assisted tooling into coding, QA, and data analysis where it genuinely earns its place, with clear guardrails around safety, privacy, security, and verification
Stay hands-on where it counts, such as technical reviews, architecture discussions, and targeted implementation, while taking ownership of delivery end-to-end on the features and fixes you drive
Roll out SDK and measurement changes deliberately: gate them behind feature flags, run quality checks, and verify post-release that real-world behavior matches intent before widening exposure

Requirements

5+ years of software development experience, with a solid foundation in data structures, algorithms, and design patterns
Experience with Android using Kotlin and Java
Substantial experience building and maintaining SDKs or libraries
Strong data literacy: comfortable writing SQL to investigate production and measurement data, using Python (or similar) for analysis, and applying data-quality monitoring practices to catch anomalies before they reach partners
A curious, proactive stance toward AI and modern engineering practices
Excellent debugging, troubleshooting, data analysis skills
Strong time management skills and a self-driven work ethic