Refinery89 is looking for a passionate and experienced Senior Mobile Developer to join our fast-growing Mobile team. If you’re excited about building scalable SDKs, integrating cutting-edge monetization tools, and helping shape the future of mobile AdTech — we’d love to meet you.
What You’ll Do :
- Design, build, and maintain high-performance mobile SDKs for Android, iOS, and Unity environments.
- Lead the integration of mediation platforms like Google AdMob, IronSource, and others to ensure top-tier monetization performance.
- Work hands-on with Prebid Server to implement both client-side and server-side bidding solutions.
- Ensure SDK scalability, stability, and performance across platforms through rigorous testing and optimization.
- Collaborate closely with Product, AdOps, and Data teams to unlock revenue opportunities and fine-tune yield strategies.
- Contribute to internal documentation, code reviews, and the continuous improvement of development practices.
- Leverage GAM360 and other programmatic platforms to drive efficient ad delivery and revenue growth.
- Stay current with emerging mobile AdTech trends and propose solutions that keep our SDKs ahead of the curve.
Who We’re Looking For :
Experienced Mobile Builder : 5+ years in mobile development with deep experience in Kotlin (Android), Swift (iOS), and Unity.AdTech Native : Strong understanding of ad mediation, monetization strategies, and RTB environments.SDK Specialist : Proven track record building and maintaining mobile SDKs at scale.Prebid & Mediation Know-How : Hands-on experience with Prebid Server, AdMob, and / or IronSource.Collaborative Developer : Comfortable working across teams and aligning technical solutions with business objectives.Detail-Oriented Engineer : Clean code, strong documentation habits, and scalable design thinking.Nice-to-Haves :
Experience with hybrid frameworks like React Native or Flutter.Familiarity with analytics tools (e.g., Firebase, AppsFlyer, Adjust).Exposure to CI / CD processes and mobile deployment pipelines.Contributions to open-source projects or developer communities.What You Can Expect from Us :
Competitive salary package based on experience and seniority.Remote-first role with flexibility — work from anywhere.Bonus structure tied to performance and impact.Ownership and autonomy in building key products used across mobile platforms.A feedback-driven, flat, and fast-paced team culture.24 holidays per year, your own equipment, and Friday half-days.Annual team retreat and ongoing learning & development support.Ready to build the future of mobile AdTech with us?
Apply today and help us shape the next generation of monetization technologies!
Senior Developer
Madrid, Community of Madrid, SpainJ-18808-Ljbffr