We are seeking a highly skilled and experienced Senior Data Scientist to join our team. In this high-impact role, you will be the expert driving our success by creating and optimizing critical areas like User Acquisition models, LTV predictions, and Ad Monetization strategies. You will shape our product roadmap through in-depth Product Analytics and ensure data-driven growth by leading A/B testing initiatives with scientific rigor. If you thrive in a fast-growing and dynamic company and want to have real impact, we’d love to hear from you!

Job Requirements

• 6+ years of professional experience in data science, focusing on machine learning, statistical analysis, and deep learning. Ideally paired with experience in the mobile gaming industry

• Proven expertise in user acquisition modeling, product analytics, and A/B testing methodologies and tools

• Proficiency in Python (Pandas, NumPy, Scikit-learn, TensorFlow, PyTorch)

• Familiarity with SQL for database querying and data manipulation

• Strong knowledge of statistical methods and their application in business

• Experience with cloud platforms (AWS, GCP) is a plus

• Strong project management skills, with a track record of leading data science projects

• Excellent communication skills and the ability to translate data into insights

• Strong problem-solving skills and the ability to work collaboratively in a cross-functional team environment

• You communicate fluently in English, both written and spoken.

Nice-to haves:

• Experience with mobile gaming analytics

• Hands-on experience with Looker for data visualization and reporting

• Familiarity with ad tech tools and platforms (e.g., Google Ads, Facebook Audience Network, Firebase)

• Knowledge of reinforcement learning and its applications in gaming or ad optimization

Job Requirements

• Predictive User Modeling: You will build and optimize machine learning models to understand and predict user behavior across the full lifecycle - acquisition, engagement, churn, and LTV. Partner with marketing, product, and growth teams to turn those predictions into measurable business impact.

• Product Analytics: You will be responsible for conducting in-depth product analysis to identify key metrics and areas for improvement, using data insights to guide product development and enhance user experience. Additionally, you will collaborate with product managers to steer data-driven features and improvements

• A/B Testing: You will collaborate closely with the product team to design, implement, and analyze A/B and multivariate tests to optimize product features and marketing strategies. During those initiatives, you will be responsible for ensuring scientific rigor and proper statistical methods. Finally, you will support interpreting the results and providing actionable insights to stakeholders

• Machine Learning & Statistical Analysis: You will develop and deploy machine learning models for predictive analytics, user segmentation, and personalization, while applying deep learning techniques for complex data analysis tasks (image recognition, natural language processing, etc.) to drive user acquisition and monetization of our JustPlay app

• Project Management: Lead data science projects from concept to delivery, coordinating with cross-functional teams (including Engineering, Product, and marketing) and managing timelines, deliverables, and stakeholder communication

Job Benefits

• Work-Life Balance and Flexibility: Flexible working hours and options for digital nomads, occasional office visitors, or regular office-goers

• Mental Health Support: Free personal coaching through our partner nilo.health to support our team members to live fulfilled lives at home and at work

• Training & Development: A competitive personal development budget of up to 2000€/year for training, conferences, workshops, etc.

• Germany-Based Benefits: 25 vacation days, free Wellhub gold subscription, free monthly Deutschland-Ticket, and a monthly €50 tax-free internet contribution

• State-of-the-Art Equipment: Doesn’t matter if you are a MacBook or Windows user; we will provide you with the technical gear you need to succeed

• A Relocation Package: Includes visa support for those who need it

• Berlin Office Perks: Ergonomic setup, free daily lunch, and a dog-friendly environment.

• Engaging and Diverse Work Environment: Join a diverse team, with over 30 nationalities working from over 25 different locations

* Benefits may vary depending on location and contract type. Do not hesitate to ask us about more details on our benefits offer.

About us

Come join the team building the engine behind rewarded mobile gaming – making playtime truly rewarding. At JustPlay, we’re on a mission to power a fairer, more sustainable rewarded gaming ecosystem where users earn real value for their time through a self-sustaining modell.

Since launching in 2020, we’ve grown into one of the world’s leading rewarded gaming platforms, with 25M+ downloads and 500K+ daily active users. Headquartered in Berlin and backed by NCSoft, one of the world’s leading gaming companies, we continue to operate fully independently – combining the speed, ownership, and ambition of a startup with the long-term backing of a global gaming powerhouse.

With a team across 20+ countries, we’re shaping a major shift in mobile gaming – and it’s still early enough for you to make your mark. At JustPlay, you’ll build end-to-end, move fast, and ship work that reaches millions – in a company that’s profitable, built to last, and focused on outcomes over hype.