[Hiring] Principal / Staff Data Scientist @Xsolla

Role Description

We are looking for an accomplished Principal Machine Learning Engineer to join our global ML organization. In this role, you will:

• Drive innovation across our machine learning ecosystem.
• Architect advanced ML solutions.
• Mentor junior ML engineers around the world.
• Shape our technical direction by leading complex ML initiatives.
• Elevate engineering standards.
• Guide teams as they build scalable, production-ready machine learning systems.

If you are ambitious, energized by solving challenging technical problems, passionate about developing talent, and excited to influence the future of ML/AI in the video game industry, this could be the perfect role for you.

Qualifications

• Advanced Degree in Statistics, machine learning, or related areas.
• Experience in statistics/ML expertise with a track record of leading high-impact data science initiatives at scale of billions of transactions.
• Hands-on experience creating, training, and fine-tuning models, not just integrating hosted model APIs.
• Experience owning models in production: deployment, monitoring, drift detection, retraining.
• Production experience with classical ML for fraud/anomaly detection, recommendation, or churn/LTV.

Requirements

• Supervised learning, transfer learning on machine learning as well as neural networks.
• Basic LLM knowledge, especially how to use it and where not to use it.
• MLOps foundations: feature stores, experiment tracking, model registries (MLflow/W&B-class), continuous training pipelines.
• Model serving and inference optimization (vLLM-class serving, quantization).

Nice-to-Have

• Publications, conference talks, or recognized open-source contributions to training/eval tooling.
• Graph-based fraud detection (fraud rings, device/account linkage).
• Gaming, payments, fraud, advertising domain experience.
• Hands-on, up-to-date experience with modern AI tools (e.g., Claude, Copilot, Cursor) for code generation, review, and accelerating day-to-day engineering work.

Benefits

• 100% company-paid medical, dental, and vision plans.
• Unlimited Flexible Time Off.
• Personalized career roadmap for each US employee.
• Investment in professional development through training and educational opportunities.

We prioritize the physical, mental, and emotional well-being of our employees and their families through a comprehensive Benefits Program. Together, we’re not just building a business; we’re cultivating a community that values creativity, collaboration, and the transformative power of play.