data scientist

X-FLOW is a mobile game development company established in 2018, known for creating Happy Color, a leading digital coloring book and ad-driven mobile app, with a diverse team spread across the UK, Cyprus, the Netherlands, and other global regions.

• Lead Data Science initiatives focused on advertising monetization, maximizing revenue while maintaining a great user experience;
• Develop ML models for ad targeting, ranking, pricing, revenue prediction, and monetization optimization;
• Improve recommendation and personalization systems to increase user engagement, retention, and lifetime value;
• Analyze user behavior and advertising performance to identify growth opportunities and drive product decisions;
• Design, analyze, and interpret A/B tests and other experiments;
• Collaborate closely with Product Managers, Engineers, and Analysts to define roadmap and prioritize high-impact initiatives;
• Mentor Data Scientists through technical guidance, code reviews, and best practices;
• Drive the adoption of scalable ML solutions and ensure high standards for experimentation and model quality;
• Present insights and technical solutions clearly to both technical and non-technical stakeholders.

• 5+ Years of experience in Data Science, preferably in consumer mobile products;
• Proven experience with advertising monetization, revenue optimization, or advertising analytics;
• Strong experience building recommendation, personalization, or ranking systems;
• Advanced proficiency in Python and SQL;
• Hands-on experience with machine learning models, including classification, regression, ranking, forecasting, and predictive modeling;
• Strong understanding of experimentation methodology and applied statistics;
• Experience working with large-scale behavioral datasets;
• Experience leading or mentoring Data Scientists and driving technical initiatives;
• Ability to translate business goals into ML solutions with measurable impact;
• Native Russian language;
• Nice to have: experience with mobile advertising ecosystems (AdMob, AppLovin, Unity Ads, ironSource, etc.), experience with recommendation systems based on embeddings, collaborative filtering, or learning-to-rank, experience deploying ML models into production, experience with LLMs or GenAI applications, experience with MLOps and cloud platforms (AWS, GCP, Azure).

• Competitive salary and benefits package;
• Opportunity to work on high-scale mobile products with millions of users;
• Direct impact on monetization strategy and core product algorithms;
• High level of ownership and autonomy;
• Opportunity to shape the Data Science direction and mentor a growing team;
• Opportunity to work with a talented and passionate team in a creative and dynamic environment;
• Flexible working hours;
• Career growth and professional development opportunities;
• A fun and inclusive company culture that celebrates diversity and creativity.