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Validity Inc. Logo

Principal AI Engineer

Validity Inc.

$200,000 - $250,000
Dec 23, 2025
Boston, MA, US
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Validity is looking to solve real problems by shipping agentic AI systems

Requirements

  • 10+ years of engineering experience shipping impactful products
  • 2+ years building agentic AI systems
  • Strong product sense and understanding on how to integrate agents into user experiences
  • Experience with agentic frameworks. We use Mastra AI, so either experience with or a willingness to learn Typescript
  • ML engineering or data science background
  • Experience with evaluation frameworks, observability tools, or synthetic data generation

Responsibilities

  • Build and deploy agentic AI systems
  • Perform research spikes to evaluate scope and feasibility
  • Help set technical direction through working prototypes and rapid experimentation
  • Create evaluation datasets, labeling workflows, and instrumentation to improve agent performance
  • Move from idea to production-ready implementation at speed

Other

  • Ability to work 3 days per week (Tuesdays, Wednesdays and Thursdays) to work on-site in Boston, MA
  • Bias toward action and rapid decision-making
  • A doer: you're hands-on with code and you experiment daily
  • Fast and intelligent: you make smart decisions quickly and iterate
  • Comfortable with ambiguity: you forge ahead when the path isn't clear