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AI Researcher

RadixArk

Ashby
Location
San Francisco; Palo Alto Office; Singapore, Singapore
Type
FullTime
Salary
Salary not specified
Posted
11 Nov 2026
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
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