Machine Learning Engineer, Consumer Alliance

HelloFresh seeks a Machine Learning Engineer for the Menu Personalization team in Warsaw. You will build and operate ML systems for recommender stacks, working with cross-functional teams to improve customer experience. The role involves designing feature pipelines, training workflows, model serving, and experimentation tooling.

• Build and operate ML systems for menu personalization across feature pipelines, training, model serving, experimentation, and infrastructure.
• Transition research and experiments into reliable production systems.
• Maintain accountability for significant components of the recommender stack from design to deployment and operation.
• Operate deliverables, instrumenting and improving systems based on real-world performance.
• Contribute to the personalization roadmap with Product and Engineering.
• Raise technical standards through code and design reviews.

• 3+ years building and operating production ML systems.
• Production experience with recommender systems or large-scale personalization strongly preferred.
• Fluency in Python, Apache Spark, and working knowledge of Kafka, Kubernetes.
• Statistical literacy for experiment design and model evaluation.
• Operational judgment to diagnose and fix system issues under load.