POS-31662
HubSpot is building the next generation of AI experiences across our go-to-market products. We’re hiring a Senior Machine Learning Engineer II to join the Flywheel Context (Contacts) team, where you’ll build the context platform layer that powers accurate, high-performing AI assistants and agents.
This is a backend-leaning ML engineering role focused on shipping production software—designing systems that help other engineering teams retrieve relevant facts, manage long/complex context, and evaluate quality at scale. If you love building durable platforms (not just prototypes), this role is for you.
Design, build, and operate backend services that power context retrieval and enrichment for AI assistants and agents.
Build platform capabilities for storing, searching, and retrieving “insights” and relevant facts across HubSpot’s GTM data.
Develop systems to manage and compress context when it gets large (e.g., long contact histories, high-volume CRM data).
Create tooling that allows other engineering teams to ship assistants/agents faster, with consistent APIs and reusable primitives.
Build and maintain evaluation and measurement approaches (offline evals, golden datasets, automated metrics, human review loops) to ensure context quality and answer accuracy.
Collaborate closely with sister platform teams and downstream product engineering teams (your “customers”) t