Cartesia · 2 months ago
Researcher, Post Training
San Francisco, CA
Full-time
Onsite
Mid LevelCartesia is pioneering the next generation of AI with a focus on interactive intelligence. The Researcher on the Post-Training team will develop methods and systems for multimodal models, emphasizing preference optimization, model evaluation, and feedback-driven learning.
Artificial Intelligence (AI)Real TimeSoftware
Responsibilities
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
Qualification
Required
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
Preferred
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
Company
Cartesia
Cartesia provides real-time multimodal intelligence for all devices.
Founded in 2023
11-50 employees
H1B Sponsorship
Cartesia has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (6)
2024 (2)
Funding
Current Stage
Early StageTotal Funding
$86MKey Investors
Kleiner PerkinsIndex Ventures
2025-03-11Series A· $64M
2024-12-12Seed· $22M
Leadership Team
Karan Goel
Founder / CEO
Arjun Desai
Co-Founder
Recent News
South China Morning Post
2025-11-26
2025-10-23
Company data provided by crunchbase