Senior Android Developer (AdTech)

TL;DR

Senior Android Developer (AdTech): Developing and optimizing the core hirify.global Ads SDK for high-performance mobile environments with an accent on Android internals, memory management, and network efficiency. Focus on building robust, low-latency SDKs that handle millions of daily auctions and integrate seamlessly into third-party applications.

Location: Onsite in Hamburg, Germany (Relocation support provided)

Company

hirify.global builds programmatic in-app advertising technologies that connect advertisers and publishers through high-scale SDKs and real-time bidding algorithms.

What you will do

• Own the core development and optimization of the Android SDK used by hundreds of publisher apps.
• Collaborate with backend teams to design APIs and capture behavioral signals for ML predictions.
• Ensure minimal footprint and high performance for ad rendering within resource-constrained environments.
• Monitor and debug SDK reliability at scale using observability tools like Sentry and Kibana.
• Maintain and improve CI/CD pipelines using Gradle and GitLab CI for efficient library delivery.

Requirements

• 5+ years of Android experience or 3+ years in SDK/library development.
• Deep expertise in Kotlin, Android lifecycles, ProGuard/R8, and multithreading.
• Strong track record in API design and high-performance networking protocols like gRPC and Protobuf.
• Experience with build automation and delivery using Gradle and GitLab CI.
• Ability to ensure zero tolerance for instability in third-party app environments.

Nice to have

• Experience in ad-tech or programmatic advertising (IAB specifications).
• Knowledge of NDK/JNI (C/C++ interop).
• Parallel iOS development experience.

Culture & Benefits

• Work on infrastructure reaching over 770 million users globally.
• Collaborate within a diverse, international team representing over 40 countries.
• Fast-paced environment with frequent shipping cycles and direct problem-solving.
• Relocation support provided for international candidates moving to Hamburg.