Senior Android Developer

Smadex is a cutting‑edge ad‑tech company: we process more than 4.5 million ad requests per second, replying in under 100 ms. Every day, we generate several TBs of data that need to be processed, analyzed, and aggregated so that our real‑time components get smarter everyday. If you’re passionate about building high‑performance mobile solutions and thrive in a fast‑paced, challenging environment, we want to hear from you This is a full‑time hybrid position based in Barcelona. As a pivotal Android SDK Developer, you’ll be instrumental in transforming our foundational SDK prototype into a robust, market‑ready product. This new SDK is strategically vital, designed to expand the functionality and provide critical insights into the supply chain of our pre‑established and robust DSP. This is a hands‑on role where you’ll be the main developer for the Android SDK, supported by a collaborative team as they shift to backend focus. You’ll own the development of the Android SDK, focusing on completing core functionalities, architecting for optimal performance, and building out essential features. Initially, a part of your work will involve migrating the existing Java prototype to Kotlin while ensuring seamless compatibility with all target Android releases. Your work will directly define the future and quality of our mobile ecosystem, working in close alignment with our iOS SDK development to ensure a unified product experience. The Opportunity Lead the architectural design and full‑lifecycle development of our new Android Ads SDK. Proactively drive performance optimization, quality enhancements, and robust testing for the SDK. Stay at the forefront of Android advancements, integrating latest platform capabilities and industry best practices. Ensure seamless integration of the SDK with the broader Smadex platform through close collaboration with cross‑functional teams. Champion code quality, actively participating in rigorous code reviews, comprehensive testing, and effective debugging processes. Requirements and Qualifications 3+ years of professional Android development experience, with a solid foundation in building robust mobile solutions. Strong proficiency in Kotlin and Java, with practical experience in or a strong desire to work on Java‑to‑Kotlin code migration. Good understanding of multithreading, networking, and Android internals. Familiarity with performance optimization, debugging, and mobile development best practices. Strong communication and collaboration skills, with a willingness to learn and contribute to team knowledge. A genuine passion for mobile technology, staying updated with the latest advancements, and contributing to the Android ecosystem. Bonus Points Experience with mobile advertising technologies such as MRAID and VAST. Knowledge of building and distributing Android libraries or SDKs. Familiarity with Unity plugins for Android. Please note that we do NOT provide VISA sponsorship. Candidates without a legal permit to work in Spain won’t be considered. What is in it for you Integrate a highly motivated and dynamic team Great compensation package Top location at the heart of Barcelona with a rooftop terrace, Barbeque, and a fully stocked fridge Great work‑life balance: work from home (2 days per week), flexible hours Access to LinkedIn Learning Meal vouchers – Ticket Restaurant monthly allowance Monthly gym allowance: Choose between DiR or Wellhub Monthly TGIF events Regular team‑building events Fun and friendly work environment with talented marketers and engineers from over 40 countries And more If you are passionate about Android development and enjoy mentoring teams while working on cutting‑edge ad‑tech solutions, we’d love to hear from you #J-18808-Ljbffr