Senior Software Engineer (AI Model LifeCycle)

• The Senior Software Engineer for the AI Model Lifecycle team will play a crucial role in building a comprehensive managed platform for the entire application development lifecycle, with a specific focus on leveraging Machine Learning models, including Large Language Models (LLMs)
• Manage fine-tuning systems for large foundation models (SFT, PEFT, LoRA, adapters), including multi-node orchestration, checkpointing, failure recovery, and cost-efficient scaling
• Implement and maintain end-to-end training pipelines for Large Language Models
• RFT and Reinforcement learning to the fine tuning and training sections
• Distillation and reinforcement learning pipelines (e.g., preference optimization, policy optimization, reward modeling)
• Dataset, model, and experiment management: versioning, lineage, evaluation, and reproducible fine-tuning at scale

Benefits

• Health & wellbeing: Comprehensive health benefits designed to support your overall wellness
• Time away: Paid time off for vacations, family bonding, and unexpected needs
• 401(k) match: Build your financial future with our 401(k) matching program
• Mental wellness: Resources and support for your emotional wellbeing and navigating life’s challenges- If you want to do the most meaningful work of your career, help our customers and partners advance their AI strategies, and be part of a high-performing team that believes in each other, come build with us at Crusoe
• We’re looking for problem-solving, opportunity-finding teammates with a sense of urgency, who believe in the scale of our ambition and thrive on a path not fully paved — people who want to grow their careers alongside a team of experts across energy, manufacturing, data center construction, and cloud services
• Passion for building cutting-edge AI products and solving challenging technical problems
• Proactive and collaborative approach with the ability to work autonomously
• Experience in Generative AI (Large Language Models, Multimodal)
• Hands-on experience training, fine-tuning, and aligning LLMs using Reinforcement Learning and Reinforcement Fine-Tuning (RFT) techniques
• 4-5+ years of industry experience leading and driving impactful projects in the AI Space
• Advanced degree in Computer Science, Engineering, or a related field
• Proficiency in Golang or Python for large-scale, production-level services and PyTorch
• Contributions to open-source AI projects such as vLLM or similar frameworks
• Performance optimizations on GPU systems and inference frameworks