Senior Machine Learning Engineer - Messaging Platform
Core
Design, build, and ship machine learning models to optimize messaging (push, email, in-app) for Spotify's billion-user platform, focusing on long-term user journeys via reinforcement learning.
Role type
Senior IC machine learning engineer (messaging optimization)
Builds
ML models for message optimization across push, email, and in-app channels
Domain
Music streaming / Recommendation systems
Deliverable
production ML models
Required skills
Production ML model deployment, multi-objective optimization, reinforcement learning, PyTorch, distributed systems (Ray), A/B experimentation design, causal inference, metric decomposition
Preferred skills
AI-assisted development tools, long-term optimization systems
Technologies
PyTorch, Ray
Responsibilities
Design and ship ML models for messaging optimization; Plan and run multi-objective A/B experiments; Contribute to reinforcement learning systems; Own the full ML lifecycle from data to deployment; Integrate ML models with upstream domain value signals; Help shape AI-assisted development tools
Seniority
Senior, hands-on IC
