Senior Staff Software Engineer, AI Model Lifecycle

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Crusoe is a vertically integrated AI infrastructure company seeking a Senior Staff Software Engineer to build a managed platform for the full AI model lifecycle. The role focuses on fine-tuning and training large foundation models, including LLMs, with multi-node orchestration and reinforcement learning pipelines. You will own dataset, model, and experiment management at scale.

• Manage fine-tuning systems for large foundation models (SFT, PEFT, LoRA, adapters) with multi-node orchestration, checkpointing, and failure recovery
• Implement and maintain end-to-end training pipelines for Large Language Models
• Build distillation and reinforcement learning pipelines including preference optimization, policy optimization, and reward modeling
• Own dataset, model, and experiment management: versioning, lineage, evaluation, and reproducible fine-tuning at scale

• Advanced degree in Computer Science, Engineering, or a related field
• 4-5+ years of industry experience leading impactful projects in the AI space
• Experience with Generative AI including LLMs and multimodal models
• Hands-on experience training, fine-tuning, and aligning LLMs using Reinforcement Learning and RFT techniques
• Proactive, collaborative, and able to work autonomously

• Proficiency in Golang or Python for large-scale production services and PyTorch
• Contributions to open-source AI projects such as vLLM
• Performance optimizations on GPU systems and inference frameworks