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RARadixArk logo

RadixArk

San Francisco

AI Researcher.

FULL TIMEREMOTEDATA & ML$200K–400K/YR

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

  • Pre-training, mid-training, and post-training of large models

  • Reinforcement learning, reasoning, and reward modeling

  • Data, evaluation, and the research behind making models measurably better

You might be a fit if you

  • Have a track record of research or engineering on large-model training

  • Care about shipping results, not just publishing them

  • Are curious, direct, and comfortable with ambiguity

Pay
$200k–400k/yr
Where
San Francisco · Palo Alto Office · Singapore
Work
Remote
Type
Full time
Posted
11 Nov, 2026
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