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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.

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    Work format
    Remote
    Seniority
    Lead
    Posted
    28 Sept 2026
    Last verified
    5 Oct 2026

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