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RadixarkPosted Nov 11, 2026
AI Researcher
San Francisco · Remotefull timeRemote$200k–$400kH1B: no
Radixark The AI Researcher at Radixark works on training large AI models across the full training stack including data, recipes, post-training, reinforcement learning, and evaluation. The role involves research and engineering to improve model training and performance.
Responsibilities
- 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
Qualification
Care about shipping resultsCurious
Required
- Track record of research or engineering on large-model training
- Care about shipping results, not just publishing them
- Curious, direct, and comfortable with ambiguity
Company
Radixark
View company pageSource: ashby
Active within the past hour
Remote-friendly