Senior Staff Software Engineer, AI Model Lifecycle

Crusoe; San Francisco (CA); On-site; USD 250,000 - 300,000; Full time

Benefits offered by this job

Restricted Stock Units

Paid time off

Health, dental & vision insurance

HSA contributions

Parental leave

Life insurance & disability

Tuition reimbursement

Wellness support

Commuter benefits

401(k) match

Volunteer time off

Job summary

Crusoe is hiring for a role focused on scaling AI model training and optimization. You will lead multi-node fine-tuning, build end-to-end training pipelines for Large Language Models, and implement reinforcement learning-based approaches to improve model alignment and performance.

We value hands-on experience with RL/RFT, Generative AI, and producing robust, production-grade AI services. This role offers a competitive compensation package including RSUs and comprehensive benefits, with salary up

Qualifications

• Advanced degree in Computer Science, Engineering, or related field.
• 4-5+ years of industry experience leading AI/ML projects.
• Experience in Generative AI, LLMs, and multimodal models.
• Hands-on experience with Reinforcement Learning and Reinforcement Fine-Tuning (RFT).

Responsibilities

• Manage fine-tuning systems for large foundation models with multi-node orchestration and cost-efficiency.
• Implement and maintain end-to-end training pipelines for Large Language Models.
• Apply reinforcement learning to fine-tuning and training stages (RFT).
• Develop distillation and RL pipelines (preference optimization, policy optimization, reward modeling).
• Manage datasets, models, and experiments with versioning and reproducibility.

Skills

Generative AI

LLMs training

Reinforcement Learning

Autonomy

Collaboration

Education

Advanced degree in Computer Science, Engineering, or related field

Tools

Python

Golang

PyTorch

Job description

Crusoe is on a mission to accelerate the abundance of energy and intelligence. As the only vertically integrated AI infrastructure company built from the ground up, we own and operate each layer of the stack — from electrons to tokens — to power the world's most ambitious AI workloads. When you join Crusoe, you join a team that is building the future, faster.

We're in the midst of the greatest industrial revolution of our time. The demand for AI compute is boundless, and power is a bottleneck. We're solving that — with an energy-first approach that makes AI infrastructure better for the world and faster for the people innovating with AI.

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.

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.

About This Role:

What You’ll Be Working On:

• 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.

What You’ll Bring to the Team:

• Advanced degree in Computer Science, Engineering, or a related field.
• 4-5+ years of industry experience leading and driving impactful projects in the AI Space
• 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.
• Proactive and collaborative approach with the ability to work autonomously
• Passion for building cutting-edge AI products and solving challenging technical problems.

Bonus Points:

• 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.

Benefits:

• Competitive compensation
• Restricted Stock Units
• Paid time off & paid holidays
• Comprehensive health, dental & vision insurance
• Employer contributions to HSA account
• Paid parental leave
• Paid life insurance, short-term and long-term disability
• Professional development & tuition reimbursement
• Mental health & wellness support
• Commuter benefits (parking & transit)
• Cell phone stipend
• 401(k) Retirement plan with company match up to 4% of salary
• Volunteer time off

Compensation Range

Compensation will be paid in the range of up to $250,000 - $300,000 + 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.