Researcher, Post Training

The role

You will own research initiatives to improve the alignment and capabilities of multimodal models. You will develop new post-training methods and evaluation frameworks and partner with research, product, and platform teams.

What you will do

• Own research initiatives to improve the alignment and capabilities of multimodal models
• Develop new post-training methods and evaluation frameworks to measure model improvement
• Partner closely with research, product, and platform teams to define best practices for creating specialized models
• Implement, debug, and scale experimental systems to ensure reliability and reproducibility across training runs
• Translate research findings into production-ready systems that enhance model reasoning, consistency, and human alignment

Required qualifications

• Deep knowledge of preference optimization and alignment methods, including RLHF and related approaches
• Experience designing evaluations and metrics for generative or multimodal models
• Strong engineering and debugging skills, with experience building or scaling complex ML systems
• Ability to trace and diagnose complex behaviors in model performance across the training and evaluation pipeline

Nice to have

• Experience with multimodal model training (e.g., text, audio, or vision-language models)
• Contributions to alignment research or open-source projects related to model evaluation or fine-tuning
• Background in designing or implementing human-in-the-loop evaluation systems

Benefits

• Competitive base salary
• Attractive equity package
• Fully covered medical insurance along with dental and vision for you and your family
• 9 weeks paternity leave
• 12 weeks maternity leave
• 401(k)
• Monthly commuter stipend
• Flexible PTO
• Lunch, dinner and plenty of snacks, provided daily
• Your own personal Yoshi

Before you apply

• Visa sponsorship is provided and assessed on a case-by-case basis
• Cartesia participates in E-Verify and will provide Form I-9 information to confirm employment eligibility after hire

About the company

Cartesia's mission is to architect AI that learns from and interacts with the world like humans do. The founding team met as PhDs at the Stanford AI Lab where they invented State Space Models.