# Software Engineer, Agent Harness 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 $250K base salary per year (USD)
- Posted: 2026-05-15
- Apply by: 2026-10-08
- Apply: https://jobs.ashbyhq.com/cartesia/16cd6cd7-454b-4e44-9a04-6a4677a3e920
- Page: https://www.1752.vc/careers/jobs/cartesia-software-engineer-agent-harness/

## About the role

Cartesia builds real-time multimodal intelligence: fast, state-of-the-art voice models, and the platform that puts them into production. We started as a research lab, pioneered the state space model architecture, and now we're bringing that research to customers through Managed Agents, our voice agents product.

## What they're looking for

- Experience building and operating distributed backend systems in production, ideally at a high-growth startup. We care more about what you've shipped than strict years of experience
- Strong product instincts: you think in customer-facing latency, reliability, and developer experience, and you have opinions on what to build and why
- Fluent use of coding agents and a habit of keeping pace with the frontier
- Clear communication with technical and non-technical audiences, sharp specs, and a strong presence in design reviews

Tags: Engineering