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Research Scientist - LLM Post-Training & RL

Job in San Francisco, San Francisco County, California, 94199, USA
Listing for: Mixpeek
Apprenticeship/Internship position
Listed on 2026-07-11
Job specializations:
  • Research/Development
    Research Scientist, AI Business & Operations
Salary/Wage Range or Industry Benchmark: 180000 - 260000 USD Yearly USD 180000.00 260000.00 YEAR
Job Description & How to Apply Below
Position: Staff Research Scientist - LLM Post-Training & RL

Trajectory is seeking a highly skilled researcher to design and build the post-training stack that enables models to continually learn from real production workflows. You will own end-to-end experiments across data, training, and evaluation, shaping telemetry into learnable signals and training and serving custom LLMs and agents.

You will work directly with the founders and design partners, making foundational technical and product decisions and helping define the culture and architecture of a

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