Role description
RadixArkAbout 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