Senior Data Scientist (m/f/d) at EGYM

EGYM is developing machine learning solutions for EGYM Genius, the personalized training plan engine. Responsibilities: - Build ML models using training and health data to support effective workouts - Analyze complex datasets and validate hypotheses - Design LLM-based components and agents that orchestrate multi-step workflows - Establish evaluation pipelines for LLM features with golden datasets and human evaluations - Work with local/open-source models, balancing quality, latency, and cost - Collaborate with Software Engineering and Product Management - Monitor AI/ML advancements to maintain state-of-the-art solutions Requirements: - 5+ years delivering ML-based solutions (personalization, recommender systems preferred) - Production-ready Python programming - SQL and NoSQL database proficiency - Strong ML fundamentals with hands-on LLM experience - Prompt design, retrieval, tool use, and multi-step flow expertise - Ability to combine classical ML and LLM approaches - Clear communication and end-to-end ownership Benefits: - €60/month flex budget (transportation/meals) - 30 days vacation annually - Hybrid work (2 office days required) - Free gym access via EGYM Wellpass - Subsidized pension - Bike leasing program - Mentoring programs - Employee discounts