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Principal Machine Learning Engineer
HubSpot
Remote · United StatesSalary not disclosedfull-timeHubSpot Careers
HubSpot is building the foundational AI infrastructure that powers our next generation of agentic product experiences. We’re looking for a Principal Machine Learning Engineer to help shape the base layer that product teams build on: agent runtime, evaluation systems, quality signals, model optimization, fine-tuning, and model routing.
Responsibilities
- Build infrastructure for agent runtime, evaluation, quality measurement, and model optimization.
- Create tooling that helps teams understand where their evals are strong, where coverage is missing, and where users are asking questions the system is not yet prepared to handle.
- Design signal pipelines that surface user frustration, agent failure states, and quality issues before they show up as CSAT drops.
- Build systems to evaluate new models across agents, improving product quality, reducing cost, and supporting future model routing.
Languages
- Work format
- Remote
- Seniority
- Lead
- Posted
- 28 Sept 2026
- Last verified
- 5 Oct 2026
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