We are looking for highly technical Senior Android Developer with deep ad-monetization expertise to build and optimize the ad-monetization stack directly inside our mobile applications. This is an Android-first engineering role: you'll write and own the Android (Kotlin/Java) code that integrates and optimizes mediation SDKs, ad placement, frequency, and bidding — backed by the backend services that drive real-time monetization decisions — to maximize revenue, fill rate, and eCPM on apps that reach millions of users. Responsibilities: - Design, develop, and optimize the core monetization infrastructure across multiple mobile applications. - Improve ad waterfall and bidding performance to maximize eCPM, fill rate, ARPDAU, and total ad revenue. - Integrate and optimize mediation platforms (AppLovin MAX, AdMob, LevelPlay, etc.). - Build intelligent optimization systems for ad placement, frequency, segmentation, and pricing. - Develop backend services and automation tools for real-time monetization decisions. - Analyze monetization performance using large-scale data and implement data-driven improvements. - Optimize SDK integrations, latency, memory usage, and overall ad performance. - Work closely with Growth, Product, and Data teams to continuously increase LTV and user monetization. - Research and implement new monetization technologies, bidding strategies, and demand sources. What you'll own - Increase overall monetization performance across millions of users. - Maximize fill rate, eCPM, advertiser competition, and total revenue. - Build the next generation of the monetization engine using automation and AI. - Deliver measurable business impact through engineering excellence. Must-have skills: - Android development (28%) — strong hands-on Android engineering in Kotlin/Java: Android SDK, app architecture, lifecycle, threading/concurrency, memory and performance optimization. This is the primary skill for the role. - Ad-monetization domain (20%) — deep understanding of RTB, Header Bidding, Waterfalls, Fill Rate, eCPM/CPM optimization, ARPDAU, and advertiser demand. - Ad mediation platforms + mobile advertising SDKs (17%) — hands-on integration and optimization of mediation SDKs (AppLovin MAX, AdMob, IronSource, LevelPlay). - Software development (15%) — solid backend services, APIs, distributed systems, and performance optimization to power real-time monetization decisions. - Analytical, data-driven optimization (12%) — analyze large-scale monetization data and implement data-driven improvements. - High-scale consumer app experience (8%) — experience with high-scale consumer applications reaching millions of users. Nice-to-have skills: - iOS development (Swift) — a plus but not required; this is an Android-first role. - Hands-on with AppLovin MAX, Google Ad Manager, AdMob, Unity Ads, or IronSource. - Building internal optimization engines using AI or Machine Learning. - Familiarity with attribution, user segmentation, A/B testing, and predictive monetization models.