AI Research Engineer (LLM)

Location: Must be based in San Francisco (On-site)

Salary: $210,000 – $450,000 per year

Company

hirify.global is an applied research lab curating data solutions for foundation model development, serving frontier AI labs to improve model performance.

What you will do

• Design and run training experiments to isolate the impact of datasets on model behavior.
• Build and maintain post-training infrastructure for SFT, RL, and evaluation workflows.
• Develop reliable pipelines for data preparation, versioning, sampling, and checkpoint management.
• Create experiment orchestration systems to ensure reproducibility and comparability.
• Integrate internal systems with partner-lab training stacks and compute environments.

Requirements

• At least 2 years of professional experience in machine learning engineering, research engineering, or ML infrastructure.
• Strong Python and software engineering skills.
• Hands-on experience with PyTorch, JAX, Ray, and Slurm.
• Experience building production-quality ML training, evaluation, or data infrastructure.
• Practical experience with LLM fine-tuning, post-training, and evaluation.
• Ability to build reliable, reproducible systems for launching and comparing ML experiments.

Culture & Benefits

• Competitive salary and meaningful equity.
• Comprehensive health insurance including medical, vision, and dental.
• 401(k) plan with employer match.
• Daily meals and UberEats stipend.
• Wellness stipend covering Equinox membership.
• Commute covered.