Fraud Prevention Engineer

adjoe – Fraud Prevention Engineer

• Hamburg
• adjoe
• Anti-Fraud Solutions
• Full time

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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.

Your Mission & Who We Are Looking For:

AdTech Domain & Anti-Fraud Core Requirement You bring a solid foundation in the AdTech ecosystem (publishers, advertisers, SDK attribution, monetization) and direct exposure to cheating in mobile games. Joining our Anti-Fraud Operations unit, you will act as the primary technical PoC for Support, Sales, and BI teams, owning complex fraud escalations and translating business edge cases into technical fixes.

Investigative Mindset & Root-Cause Analysis You possess eagle-eyed curiosity and an investigative, hacker mindset. When publisher margins drop, external platforms (iOS/Android) shift, or campaigns misbehave, you won’t wait for step-by-step instructions—you will connect messy clues, reproduce exploit scenarios, and trace non-obvious fraud patterns to their source.

AI-Empowered Big Data Interrogation You will leverage AI tools alongside Trino SQL, ScyllaDB, and DynamoDB to rapidly query and analyze billions of daily telemetry events. You will direct AI to accelerate complex data analyses, build models, and surface bad actors in real time without getting bogged down in manual query assembly.

Observability, Profiling & Microservice Debugging You will monitor platform health and debug system anomalies using Kibana, Grafana, and Go profiling tools like Pyroscope and pprof. You will trace real-time pipeline bottlenecks and API glitches across Kafka, SQS, and Go microservices to catch bugs or platform misconfigurations.

Cross-Functional Fraud Mitigation & Pragmatic Engineering You bring a functional software development background in backend engineering (preferably Go) alongside experience with AWS cloud infrastructure, allowing you to comfortably navigate backend code logic. Collaborating with Backend, Mobile, and Data Science teams, you will use AI to draft clean code fixes, propose new detection rules, and take full responsibility for deploying verified mitigations that protect publisher margins.

🌎 We welcome applications from talent worldwide and provide relocation support to Hamburg, Germany for those ready to join our team.

What’s in It for You?

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.

Go Big. Own projects with impact on 770M users and push adtech boundaries.

Move Fast. Ship solutions multiple times a day, learn from results, and keep momentum.

Be Direct. Solve problems openly and collaborate across teams.

Thrive Together. Grow with a diverse, global team of people from over 40 different countries that learn from each other.

Have Fun. Celebrate wins, enjoy daily victories, and bring your energy.

We welcome applications from people who will contribute to the diversity of our company.

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Tips & Tricks to Nail Your Interviews!

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Skip cover letters

Since we want to keep everything fast and easy for you, we don’t want you to waste time on a cover letter – we would rather take a look at your CV and if it’s a match, we directly invite you to a first call.

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Check your equipment

Test your internet connection, camera, mic, and speakers beforehand. Time for each interview is limited, and we’d like to spend as much of it as possible on getting to know each other. If the interview is online, always have your camera on! It’s way easier to create a meaningful interaction if we also see each other.

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Do some research

We will give you all the information about the role & company’s culture, but it’s always nice to see how you perceive us after doing some online detective work. 😉

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Prepare an elevator pitch

We will certainly ask you to briefly summarize your work experiences in a short overview. Think of what you’re going to say beforehand so you can fit all of the essential information in 2-3 minutes. Keep the goal of the interview in mind, and make sure everything you say is relevant to the position you’re applying for.

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Structure your answers

Be specific, but don’t get caught up in details – following the STAR method can help you: Situation (set the scene and give the necessary details of your example) – Task (describe what your responsibility was in that situation) – Action (explain exactly what steps you took to address it) – Result (share what outcomes your actions achieved).

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Let your personality shine

It is a recruiting process, but this doesn’t mean you can’t loosen up and showcase your personality. We are looking for an authentic character and we are open to having some small talk or a funny joke thrown into the mix. This might even show us that you’re a good cultural fit. Remember, next to all our ambition we like to have fun!

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Come with your questions

At the end of the interview, we will ask you whether you have any questions for us. Use this time to get answers to all your questions or clear out any curiosities. Always have two or three questions prepared, whether about the position specifically or about career development, upcoming projects, or company culture.

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Don’t be afraid of rescheduling

Even if you’ve already scheduled an interview, urgent things might pop up in your schedule or you might not feel fit to attend the interview. We are all humans & we treat these situations with empathy. It’s better to reschedule rather than not be 100% prepared to attend the interview. Simply communicate the change with your TA Manager and we will find a solution.

Finding Home Abroad – Relocation Stories

We’re supporting new colleagues from all over the world to move to Hamburg, Germany – see what they have to share about their relocation experience:

Read Relocation Article

“Unlike other companies, justDice/applike was there for me from the beginning. After signing the offer, I got comprehensive support in gett