# Researcher, Post Training at Cartesia

- Company: Cartesia
- What the company does: Integrate real-time text-to-speech with Sonic-3.6, Cartesia. Backed by General Catalyst, Index and Kleiner Perkins.
- Company website: https://www.cartesia.ai/
- Type: Startups (AI role)
- Level: Mid level
- Location: *HQ - San Francisco, CA
- Work setup: On-site
- Pay: $180K to $350K base salary per year (USD)
- Posted: 2025-10-21
- Apply by: 2026-10-08
- Apply: https://jobs.ashbyhq.com/cartesia/33a8d2ef-ccc1-446a-8fd3-9c21cd211900
- Page: https://www.1752.vc/careers/jobs/cartesia-researcher-post-training/

## About the role

The next leap in model intelligence won’t come from scale alone — it will come from better post-training and alignment. Cartesia’s Post-Training team is developing the methods and systems that make multimodal models truly adaptive, aligned, and grounded in human intent.

## What they're looking for

- 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

Tags: Research