ML Engineer

About the Position

At Aristocrat, we are advancing gaming technology with modern, powerful solutions. Our mission is to bring happiness to life through play. We value collaboration, creativity, and a strong passion for excellence. We are looking for an ML Engineer to join our MLOps team and strengthen its modeling core. You will own machine learning models end to end, from data and experimentation to production, and help us build the monitoring and experimentation culture that keeps them reliable and aligned with the business over time. You will make a real difference in our products and players' experiences.

Responsibilities

• Design, train, evaluate, and retrain machine learning models with emphasis on recommender systems that support game features, player experience, and operational efficiency.
• Own the design of our model performance monitoring: define what to track (drift, data quality, degradation), thresholds, and what “the model is still healthy” means in business terms.
• Help establish a solid experimentation culture: model versioning and experiment tracking with tools such as MLflow or Weights & Biases, so experiments are reproducible and model versions are easy to compare and promote.
• Help establish a model governance culture: define how models are promoted to production and lay the foundations of the communication contract between the MLOps team and Data Science.
• Create templates and cookiecutter scaffolding to standardize how Data Science structures, hands off, and communicates its models and experiments.
• Build robust training and feature-engineering pipelines, and write clean, production-ready Python and SQL.
• Explore and contribute to early-stage projects involving LLMs, RAG, and agentic AI where they bring value - as a complement to the role, not its core.
• Develop simple interfaces (e.g., Streamlit) to expose ML capabilities to non-technical users when useful.
• Collaborate with teams across product, data, and engineering, and communicate results, limitations, and recommendations clearly across technical and business audiences.

Requirements

• 4+ years of experience applying machine learning to real-world problems, from data to deployment.
• Proven experience with recommender systems (collaborative filtering, ranking, or similar) applied to real products.
• Strong Python skills and hands-on experience with ML libraries (scikit-learn, PyTorch/TensorFlow, XGBoost or similar).
• Solid SQL expertise and experience working with large data warehouses.
• Hands-on experience with experiment tracking and/or model registry tools (MLflow, Weights & Biases, or equivalent).
• Experience designing or contributing to model monitoring / performance tracking in production.
• Comfort working with cloud platforms (e.g., GCP, AWS, Azure), Docker, and Airflow.
• A strong analytical foundation, with a background in a quantitative field (mathematics, physics, computer science, engineering) or equivalent experience.

Nice to Have

• Experience with Snowflake or similar cloud data warehouses.
• Hands-on experience building applications with Generative AI (LLMs), including API integration.
• Interest or early experience in RAG systems - whether through prototypes, side projects, or professional work.
• Interest or familiarity with agentic AI concepts or frameworks (e.g., LangChain agents, CrewAI).
• Ability to build simple user interfaces (e.g., Streamlit) to expose ML models to wider teams.

We Offer

• Competitive salary range: €43,926 - €81,577 per year.
• Hybrid role with 3 days at the office weekly.
• Comprehensive pay and benefits package designed to stay competitive in the market, support your wellbeing, and recognize your contribution to our success.

About the Company

Aristocrat is a world leader in gaming content and technology, and a top-tier publisher of free-to-play mobile games. With three operating business units, spanning regulated land-based gaming (Aristocrat Gaming), social casino (Product Madness), and regulated online real-money gaming (Aristocrat Interactive), our team of over 7,300 employees worldwide is united by our company’s mission to bring joy to life through the power of play. We deliver great performance for our B2B customers and bring joy to the lives of the millions of people who love to play our casino and mobile games. And while we focus on fun, we never forget our responsibilities. We strive to lead the way in responsible gameplay, and to lift the bar in company governance, employee wellbeing, and sustainability. We’re a diverse business united by shared values and an inspiring mission to brighten life through the joy found in play.