Cartesia

Software Engineer, Agents

*HQ - San Francisco, CA

Sponsorship not specifiedDetected 68 days ago

PythonGoDistributed SystemsDatabricksDockerKubernetesgRPCSystems EngineeringLoad BalancingVoIP

About the role

The Agents stack - a Go API with Python workers - is what customers rely on to run real-time, production-grade voice agents.

Build and operate the distributed systems behind Cartesia's voice agents: load balancing servers, workers, and the realtime media pipelines that tie them together.
Take projects from spec to production: design, build, ship, monitor, iterate.
Define the developer experience for engineers building on Cartesia: APIs, observability, and applied evaluations.
Our team combines deep expertise in model innovation and systems engineering paired with a design-minded product engineering team to build and ship cutting edge models and experiences.
We're funded by leading investors at Index Ventures and Lightspeed Venture Partners, along with Factory, Conviction, A Star, General Catalyst, SV Angel, Databricks and others.
We're fortunate to have the support of many amazing advisors, and 90+ angels across many industries, including the world's foremost experts in AI.
You'll own backend work end-to-end and directly shape the latency, reliability, and developer experience of every agent built on Cartesia.
🦖 Your own personal Yoshi

3+ years building distributed backend systems in production, ideally at a high-growth startup. We care more about what you've shipped than strict YOE.
Strong product instincts for platform work - you think in customer-facing latency, reliability, and developer experience, and you have opinions on what to build and why.
Second-order thinking about backend architecture - you can explain why a design choice was made and what it trades off.
comfortable writing clear specs and contributing actively in design reviews.
Note: Cartesia participates in E-Verify and will provide the federal government with Form I-9 information to confirm employment eligibility after hire.

We care more about what you've shipped than strict YOE.
Fluent, day-to-day use of AI coding tools, and a habit of keeping pace with the frontier.
A strong communicator with both technical and non-technical audiences
Experience with Go and/or Python in a backend platform context.
Realtime media systems in production (WebRTC, SIP, RTP, low-latency audio)
Deep experience with cloud and infra primitives (Kubernetes, Docker, NATS, gRPC, OpenTelemetry and modern observability stacks).
Distributed systems at scale dealing with non-trivial throughput, autoscaling, multi-region architectures.
Voice agents or agent framework experience (Pipecat, LiveKit, OpenAI Agents SDK, Claude SDK, Vercel AI SDK).

💰 Compensation Competitive base salary alongside attractive equity package.
🩺 Health Insurance Fully covered medical insurance along with dental and vision for you and your family.
🧑‍🧑‍🧒‍🧒 Parental Leave 9 weeks paternity & 12 weeks maternity leave
🚆 Commuter Allowance A monthly stipend to help you get to and from the office.
🏖️ Flexible PTO Take as much time as you need to recharge your batteries.
We consider qualified applicants without regard to race, color, religion, sex, national origin, age, disability, veteran status, genetic information, or any other legally protected status.

Our mission is to architect AI that learns from and interacts with the world like humans do.
Cartesia is hiring a Software Engineer, Agents to build the backend platform behind Line, our voice agents product.

We provide visa sponsorship support and assess each circumstance on a case-by-case basis.
However, visa sponsorship is dependent on many factors, including the role you are applying for, and the location you are going to be based, and so we can't always guarantee success.
Your Recruiter will work with you to understand your visa sponsorship needs from the first call.

This listing is sourced directly from Cartesia's careers page and normalized into a canonical job model.