AI Researcher is open at Radixark in San Francisco (hybrid). The posting gives a salary of $200K - $400K. Posted on Nov 11, 2026, and still on Radixark’s careers page when we last checked, on Nov 14, 2026.
About the role
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
The employer’s own description, as published on Radixark’s careers page.
Hiring at Radixark
Radixark has 19 open roles right now. Most are in Engineering, Product and Sales & Business Development. The median advertised salary across its roles with a published range is $300K. See all its roles