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Senior Machine Learning Engineer, Model Training and Reinforcement Learning

About Nebius: Nebius is leading a new era in cloud infrastructure for the global AI economy. We are building a full-stack AI cloud platform that supports developers and enterprises from data and model training through to production deployme

Company

Nebius

Location

Palo Alto, California, United States

Status

Open

Posted

2026-07-22T22:52:25+00:00

Nebius Token Factory is hiring a senior engineer to own large-scale training and reinforcement-learning experiments for frontier model improvement. The work covers SFT, continued pretraining, preference optimization (DPO/IPO/KTO) and RLHF/RLAIF, PPO and GRPO, plus reward functions, verifiers, synthetic data pipelines, and distributed training infrastructure built on Megatron-LM, DeepSpeed, PyTorch FSDP and Ray. Candidates need strong Python and PyTorch skills, experiment design, and hands-on model training or RL experience. The role is on-site in Palo Alto, with a posted base range of $195,200 to $262,200.