Senior ML Platform Engineer Build Scalable AI Infra

Klaviyo is seeking a Senior Machine Learning Platform Engineer to build core ML and AI platforms and tools. You will drive initiatives for training, deploying models, and scaling systems at data and traffic scale. This is a backend-heavy, hands-on IC role based in Boston. You will collaborate with product, ML, data science, and infra teams to deliver durable platforms that accelerate AI development across Klaviyo, with a focus on reliability and cost efficiency.