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Research Scientist - LLM Post-Training & RL
Job in
San Francisco, San Francisco County, California, 94199, USA
Listed on 2026-07-11
Listing for:
Mixpeek
Apprenticeship/Internship
position Listed on 2026-07-11
Job specializations:
-
Research/Development
Research Scientist, AI Business & Operations
Job Description & How to Apply Below
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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