About JustPlay
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 model.
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.
Your Role
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 such as 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, dynamic company and want to have a real impact, we’d love to hear from you!
Your Responsibilities
- Predictive User Modeling: Build and optimize machine learning models to understand and predict user behavior across the full lifecycle, including acquisition, engagement, churn, and LTV. Partner with marketing, product, and growth teams to turn those predictions into measurable business impact.
- Product Analytics: Conduct in-depth product analysis to identify key metrics and areas for improvement. Use data insights to guide product development, enhance user experience, and collaborate with product managers on data-driven features and improvements.
- A/B Testing: Collaborate closely with the product team to design, implement, and analyze A/B and multivariate tests to optimize product features and marketing strategies. Ensure scientific rigor and appropriate statistical methodologies, while helping stakeholders interpret results and turn them into actionable insights.
- Machine Learning & Statistical Analysis: Develop and deploy machine learning models for predictive analytics, user segmentation, and personalization. Apply deep learning techniques to complex data analysis tasks, such as image recognition and natural language processing, to drive user acquisition and monetization of our JustPlay app.
- Project Management: Lead data science projects from concept through delivery, coordinating with cross-functional teams including Engineering, Product, and Marketing. Manage timelines, deliverables, and stakeholder communication.
Job Requirements
- 6+ years of professional experience in data science, with a focus on machine learning, statistical analysis, and deep learning. Experience in the mobile gaming industry is highly desirable.
- Proven expertise in user acquisition modeling, product analytics, and A/B testing methodologies and tools.
- Proficiency in Python, including Pandas, NumPy, Scikit-learn, TensorFlow, and PyTorch.
- Familiarity with SQL for database querying and data manipulation.
- Strong knowledge of statistical methods and their application in business.
- Experience with cloud platforms such as AWS or GCP is a plus.
- Strong project management skills, with a proven track record of leading data science projects.
- Excellent communication skills and the ability to translate complex data into clear, actionable insights.
- Strong problem-solving skills and the ability to work collaboratively in a cross-functional team environment.
- Fluent 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 such as Google Ads, Facebook Audience Network, and Firebase.
- Knowledge of reinforcement learning and its applications in gaming or ad optimization.
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 in living fulfilled lives at home and at work.
- Training & Development: A personal development budget of up to €2,000 per year for training, conferences, workshops, and more.
- Germany-Based Benefits: 25 vacation days, free Wellhub Gold subscription, a free monthly Deutschland-Ticket, and a monthly €50 tax-free internet contribution.
- State-of-the-Art Equipment: Whether you’re a MacBook or Windows user, we’ll provide the technical equipment you need to succeed.
- Relocation Package: Relocation support, including visa assistance for those who need it.
- Berlin Office Perks: Ergonomic workspace setup, free daily lunch, and a dog-friendly environment.
- Engaging and Diverse Work Environment: Join a diverse team representing more than 30 nationalities and working from over 25 different locations.
Benefits may vary depending on location and contract type. Do not hesitate to ask us for more details about our benefits offering.
