AI Researcher
Palo Alto, CAFull-timePosted 3 days agoStill listed 2 days ago
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At a glance
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Job overview
RadixArk is seeking researchers and engineers to train AI models across the full training stack, from data and training recipes through post-training, reinforcement learning, and evaluation. The team works on large-model pre-training, mid-training, and post-training, as well as reasoning and reward modeling. Candidates may bring research or engineering experience in large-model training and should value shipping results alongside research.
Skills & qualifications
Skills
Qualifications
Full job description
About the role We’re looking for researchers and engineers who love training the best AI models. You’ll work on the full training stack, from data and recipes to post-training, RL, and evaluation, alongside a small, high-caliber team building at the frontier of AI systems. What you might work on
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Pre-training, mid-training, and post-training of large models
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Reinforcement learning, reasoning, and reward modeling
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Data, evaluation, and the research behind making models measurably better
You might be a fit if you
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Have a track record of research or engineering on large-model training
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Care about shipping results, not just publishing them
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Are curious, direct, and comfortable with ambiguity
How this job compares
Set against the 7,391 open AI Engineer jobs on Olive Jobs, counted November 14, 2026.
- Pay
- This postingNot listed
- California median$154–255K/yr1,166 salary ranges
- US median$31–81/hr116 hourly ranges
- Openings
- Olive Jobs lists 1,388 open AI Engineer jobs in California and 7,391 across the US. 8% of them nationwide are listed as remote or flexible.
- Experience
- AI Engineer postings that state a minimum ask for 5 years of experience at the median; the middle half ask for 3 to 7 years (6,514 postings).
- Education
- 3,094 of the 7,391 open AI Engineer jobs (42%) ask for a bachelor's degree or higher.
Counted across the open, public US postings on Olive Jobs on November 14, 2026. Figures based on too few postings are left out.
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