Senior Android Developer – Kotlin & SDK Specialist

About the role

adjoe is looking for a Senior Android Developer to own and optimise the adjoe Ads SDK that runs inside hundreds of publisher apps. You will work on high‑performance, low‑footprint code that powers billions of daily ad predictions.

Key responsibilities

• Develop, maintain and optimise the native Kotlin SDK for Android, ensuring stability across millions of devices.
• Design and implement high‑performance APIs in collaboration with backend teams, using gRPC, Protobuf, Wire and OkHttp.
• Guarantee backward compatibility and minimal resource consumption (battery, memory, footprint) for ad impressions.
• Monitor SDK reliability at scale, using observability tools such as Sentry, Kibana and AWS services.
• Collaborate with the analytics team to turn raw data into actionable insights.

Required profile

• 5+ years of Android development experience (or 3+ years focused on SDK/library development).
• Strong expertise in Kotlin and deep understanding of Android lifecycles, ProGuard/R8 and multithreading.
• Proven track record designing stable, backward‑compatible APIs for large external integrators.
• Experience with high‑throughput networking protocols and performance optimisation.
• Data‑driven mindset with ability to use monitoring and analytics tools.

Required skills

• Kotlin
• Android SDK
• ProGuard / R8
• Multithreading
• gRPC
• Protobuf
• Wire
• OkHttp
• Sentry
• Kibana
• AWS S3
• AWS QuickSight
• AWS Athena