Senior Android Developer at Sigma Software — Poland

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About The Role

Develop, enhance, and maintain native Android SDKs used in production environments
Implement new SDK features and improve existing functionality
Ensure SDK stability, backward compatibility, and release quality
Design and support SDK architecture, packaging, versioning, and release processes
Maintain Maven and Gradle distribution pipelines
Create and maintain automated and device-based testing solutions
Investigate and resolve SDK defects, integration issues, and publisher-reported problems
Collaborate with cross-functional teams to improve SDK reliability and performance
Participate in release planning, validation, and quality assurance activities
Support external publishers during SDK integration and troubleshooting
4+ years of commercial Android development experience
Strong commercial experience with Kotlin and Java
Proven experience developing native Android SDKs or libraries
Strong understanding of Android SDK architecture and lifecycle
Hands-on experience with SDK packaging and distribution tools such as Maven Central, JitPack, and Gradle plugins
Experience with versioning, release management, and dependency handling
Practical experience with automated testing and device-based testing
Strong focus on software quality and production reliability
Experience working in release-critical environments
Ability to troubleshoot complex integration and compatibility issues
Good communication skills and ability to work in a distributed team environment
Upper-Intermediate English level or higher WILL BE A PLUS
Experience with AI-assisted testing approaches and test coverage optimization
Understanding of mobile advertising technologies and AdTech ecosystems
Experience with SSP platforms and ad servers
Knowledge of banner and video advertising mechanics
Familiarity with tracking beacons and pixel-based analytics
Experience contributing to or maintaining open-source SDKs
Experience supporting third-party publisher integrations