Technology, Information and Internet

adjoe GmbH

51-200

Funded training, courses and certifications to grow your skills.

Career Training

A laptop and the software you need, provided by the employer.

Company laptop

A share in the company's success through equity or stock options.

Company stock options

Adapt your start and end times around your life and workload.

Flexible working hours

Free coffee, tea, water and soft drinks at the office.

Free beverages

Free fruit, snacks and small refreshments at the office.

Free snacks

Work from home for part of your working week.

Home Office

A gym at the workplace, free to use for employees.

On-site fitness center

Bring your dog or pet along to the office.

Pets allowed

A covered or subsidised ticket for buses, trains and local transit.

Public transportation benefits

Financial and practical support if you move for this job.

Relocation package

Work fully remotely, from home or anywhere agreed.

Remote work

 Travel costs for your commute or work trips are reimbursed.

Travel expenses compensation

adjoe builds the technologies behind mobile apps growth and monetization. With our core product Playtime Arcade, we've become the global leader in rewarded advertising, an ad unit built on a simple premise: users earn real in-app rewards for engaging with new apps. The result is one of the most effective value exchanges in adtech, connecting advertisers and publishers with over 770 million users annually.
Ensuring Authenticity for Billions of Daily Rewards
Industry reports suggest 25 percent of global mobile ad spend is lost to fraudulent activities like click farms, fake installs, SDK spoofing, and emulator farms. At adjoe, we define our platform through trust and proactive engineering. We build high-performance defenses that guarantee accurate reward attribution, ensuring every interaction is authentic. This creates a sustainable value exchange that empowers our partners to grow with confidence.
The Anti-Fraud team develops systems that detect and prevent malicious activity at scale. Our custom Android and iOS SDKs analyze device integrity for modifications like Xposed frameworks, Magisk modules, and jailbroken devices. Supporting these, Go microservices and DynamoDB deliver millisecond-level responses, while Kafka and SQS process billions of daily events in real time. This infrastructure protects publisher margins and ensures a trustworthy platform for all users.
<h2>Your Mission &amp; Who We Are Looking For:</h2>
<ul>
<li>Mobile developer comfortable on both platforms. You're studying Computer Science or a related field with solid hands-on knowledge of Swift or Java/Kotlin. You're proficient in either iOS or Android app development — at adjoe, you'll be contributing to SDKs that run on tens of millions of devices every day.</li>
<li>Security-minded and curious about how things break. A core part of this role is investigating how users can bypass or fool fraud prevention methods in our mobile SDKs. You think adversarially — not just about how things work, but how they can be exploited.</li>
<li>Collaborative by default. You'll work closely with Mobile, Backend, and QA engineers across teams, aligning on architecture and best practices. SDK development experience is a plus.</li>
</ul>
<h2>What’s in It for You?</h2>
At adjoe, you’re not here to just close JIRA tickets, you’re helping build the infrastructure behind one of the most impactful platforms in adtech. The systems you work on will reach hundreds of millions of users and power billions of decisions every day.
<ul>
<li>Go Big. Own projects with impact on 770M users and push adtech boundaries.</li>
<li>Move Fast. Ship solutions multiple times a day, learn from results, and keep momentum.</li>
<li>Be Direct. Solve problems openly and collaborate across teams.</li>
<li>Thrive Together. Grow with a diverse, global team of people from over 40 different countries that learn from each other.</li>
<li>Have Fun. Celebrate wins, enjoy daily victories, and bring your energy.</li>
</ul>
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.

Working Student - Mobile Developer (f/m/d)

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