Senior Machine Learning Engineer - Policy & Safety

Requirements

• You have solid experience building and deploying machine learning systems in production environments at scale
• You are experienced with training, evaluating, and maintaining ML models using modern frameworks such as PyTorch
• You have a deep understanding of machine learning evaluation, including dataset design, metrics, and continuous improvement systems
• You know how to design systems that balance performance, reliability, and real-world impact in high-stakes domains
• You care about building safe, responsible, and user-centric ML systems
• You are comfortable working across disciplines, partnering with legal, policy, and product stakeholders
• You have experience leading technical projects and influencing direction within a team or product area
• You have experience with distributed systems or backend technologies (e.g., Scala)

What You'll Be Doing

• Design, build, and ship production-grade machine learning systems that power content safety and policy enforcement at Spotify scale
• Own and lead key technical initiatives across detection, classification, and policy evaluation systems
• Develop and maintain ML models for content moderation, including multimodal and LLM-based systems
• Build robust evaluation frameworks, including standardized datasets, offline and online metrics, and continuous improvement loops
• Drive experimentation to improve model performance, reliability, and fairness in safety-critical systems
• Collaborate closely with cross-functional partners in Trust & Safety, Legal, and Public Affairs to align on policy and enforcement needs
• Provide technical leadership within the team, mentoring engineers and contributing to ML strategy and prioritization
• Represent technical decisions and trade-offs in stakeholder discussions and influence product direction

Nice to Haves

• You have experience with distributed systems or backend technologies (e.g., Scala)

Where You'll Be

• This role is based in London or Stockholm
• We offer you the flexibility to work where you work best! There will be some in person meetings, but still allows for flexibility to work from home.