Senior Software Engineer, AI Model LifeCycle

Location San Francisco, CA - US Employment Type Full time Location Type On-site Department Cloud Engineering Crusoe's mission is to accelerate the abundance of energy and intelligence. We’re crafting the engine that powers a world where people can create ambitiously with AI — without sacrificing scale, speed, or sustainability. Be a part of the AI revolution with sustainable technology at Crusoe. Here, you'll drive meaningful innovation, make a tangible impact, and join a team that’s setting the pace for responsible, transformative cloud infrastructure. About this role The Senior Software Engineer for the Model LifeCycle team will contribute to building a managed platform for the entire application development lifecycle, with a specific focus on leveraging Machine Learning models, including Large Language Models (LLMs). What You Will Be Working On Implement and maintain systems for fine-tuning 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. Implement components for distillation and reinforcement learning pipelines (e.g., preference optimization, policy optimization, reward modeling). Develop and maintain core agent execution infrastructure. Implement features for dataset, model, and experiment management, focusing on versioning, lineage, evaluation, and reproducible fine-tuning. Collaboration and Impact Work closely with Senior Engineers and Principal Engineers, as well as product and platform teams, to implement system abstractions and APIs. Contribute to technical discussions on training runtimes, scheduling, storage, and model lifecycle management. 4-5+ years of industry experience with demonstrated history of consistent success leading a varied portfolio of initiatives across your function Engage with the open-source LLM ecosystem. This role involves significant implementation ownership for core system components. What You’ll Bring to the Team Engineering Fundamentals Bachelor's degree in Computer Science, Engineering, or a related field. Experience delivering production-ready features. Familiarity with essential cloud-based services (e.g., compute, storage, networking). AI/ML Expertise Familiarity with Generative AI (Large Language Models, Multimodal). Experience with AI infrastructure components (training, inference). Preferred Qualifications Proficiency in Golang or Python for production services. Familiarity with PyTorch. Some experience with training and fine-tuning LLMs. Personal Attributes Proactive and collaborative approach. Strong communication and interpersonal skills. Passion for building AI products and solving technical problems. Benefits Industry competitive pay Restricted Stock Units in a fast growing, well‑funded technology company Health insurance package options that include HDHP and PPO, vision, and dental for you and your dependents Employer contributions to HSA accounts Paid Parental Leave Paid life insurance, short‑term and long‑term disability Teladoc 401(k) with a 100% match up to 4% of salary Generous paid time off and holiday schedule Cell phone reimbursement Tuition reimbursement Subscription to the Calm app MetLife Legal Company paid commuter benefit; $300/month Compensation Range Compensation will be paid in the range of up to $166,000 - $201,000 + Bonus. Restricted Stock Units are included in all offers. Compensation to be determined by the applicants knowledge, education, and abilities, as well as internal equity and alignment with market data. Crusoe is an Equal Opportunity Employer. Employment decisions are made without regard to race, color, religion, disability, genetic information, pregnancy, citizenship, marital status, sex/gender, sexual preference/ orientation, gender identity, age, veteran status, national origin, or any other status protected by law or regulation. #J-18808-Ljbffr