Working Student - Mobile Developer (f/m/d) adjoe is redefining the future of mobile ads. Powered by advanced AI, first-party data and world-class engineers, we’ve perfected the offerwall experience for monetizing and scaling app publishers with solutions like Playtime and Arcade – now the fastest growing rewarded advertising channel globally – driving incremental engagement, retention, and revenue. At the same time, we’re breaking into programmatic advertising with the intelligent bidding system of adjoe Ads. Together, this ecosystem connects app developers to over 600 million users worldwide for scalable growth. Operating from offices in Hamburg, Boston, Singapore, and Tokyo, adjoe is defining the next stages of app and ad experience – right now. Join us. Meet Your Team: Anti-Fraud Solutions Our Anti-Fraud Solutions team tackles one of adtech's biggest challenges: industry reports suggest 25% of global mobile ad spend is fraudulent. We've built sophisticated systems that actively prevent fraud from impacting our partners' business. At the core of our solution are custom-built mobile SDKs for Android and iOS, which analyze device integrity and detect modifications like Xposed frameworks, Magisk modules or jailbroken devices. Our distributed cloud infrastructure powered by SQS and Kafka processes billions of daily events to flag suspicious behaviors in real time, while Go-based microservices deliver millisecond-level responses using DynamoDB as our database. For developers interested in cheat prevention, this means working with cutting-edge tech to continuously outsmart even the most creative tactics. As a Working Student in the Anti-Fraud team, you will support our team in both Android and iOS SDK development. You will help implement anti-fraud related features, assist in finding and tracking new fraudulent behaviors, and contribute to validating documentation for new features. This is a perfect opportunity to gain hands-on experience in mobile SDK development and see how modern software products are built and maintained. Join a team that is excited about the latest technologies and is highly interested in data, security, cloud computing, and mobile operating systems. Not to mention a team that celebrates many awards for leading the way in fraud prevention. \nWhat You Will Do: Work alongside Mobile Developer on iOS and Android SDKs that run on tens of millions of devices every day. Work with Backend developers and QA engineers to deliver necessary features Collaborate with other teams contributing to the same project to align on best practices and architecture Investigate ways users can break or fool our fraud prevention methods in our SDKs Who You Are: You study in computer science (or a similar field) You have good knowledge of Swift and Java/Kotlin You are proficient in both iOS and Android app development You are interested in mobile advertising industry Optional: SDK development experience Fuel for the Journey: Benefits to Support Your Ambitions Live Your Best Life, at Work and Beyond: We work in a hybrid setup with 3 core office days, plus flexible working hours. Enjoy a lot of vacation days, hybrid work model, free access to an in-house gym with lots of different fitness classes and mental health support through our Employee Assistance Program (EAP), and many other benefits! Thrive Where You Work: Enjoy the Alster Lake view from our central office with top-notch equipment, fun open spaces, and a large variety of snacks and drinks. Join the Community! Participate in regular team and company events, including hackathons and social gatherings. We work together, and we celebrate together, too. \n Skip writing cover letters. Tell us about your most passionate personal project, your desired salary and your earliest possible start date. We are looking forward to your application! We welcome applications from people who will contribute to the diversity of our company.