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AfterQueryAfterQuerySan Francisco, CA

Research Scientist - Post Training

Design and run SFT/RL experiments to measure dataset impact on LLM performance, capabilities, and alignment. Collaborate with labs to provide evidence of improvements; requires strong LLM training knowledge and fast experimentation, ideally undergrad/master's research background.

150k – 250k
On-siteAI Research

About the role

What You'll Do

  • Run controlled SFT and RL experiments to measure the impact of our datasets on model performance.
  • Quantify lift across capabilities (reasoning, tool use, long-horizon tasks, domain-specific workflows).
  • Communicate your findings with partner labs to help drive sales.
  • Work with internal SPLs to iterate on data quality based on your results.

What We're Looking For

  • Strong familiarity with LLM training and evaluation methodologies.
  • Genuine obsession with how data structure, selection, and quality drive model behavior.
  • Ability to design lightweight experiments, move fast, and extract actionable insights from messy results.
  • Comfort working across domains (you'll touch finance, software engineering, policy, and more).
  • A bias toward building over theorizing.
  • Great candidates are undergrad research or master's research (but haven't done a phd).

Compensation Structure

$250k-450k total compensation + equity

Skills

Llm TrainingSftRlModel EvaluationPyTorchHugging FaceExperiment DesignData QualityReasoning CapabilitiesTool Use

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