Software Engineer, Agents

About the Role Cartesia is hiring a Software Engineer, Agents to build the backend platform behind Line, our voice agents product. The Agents stack — a Go API with Python workers — is what customers rely on to run real‑time, production‑grade voice agents. You’ll own backend work end‑to‑end and directly shape the latency, reliability, and developer experience of every agent built on Cartesia. Your Impact Build and operate the distributed systems behind Cartesia’s voice agents: load balancing servers, workers, and the real‑time media pipelines that tie them together. Take projects from spec to production: design, build, ship, monitor, iterate. Make the architectural calls that compound over time – latency budgets, reliability targets, scaling primitives – and clearly articulate the tradeoffs. Define the developer experience for engineers building on Cartesia: APIs, observability, and applied evaluations. What You Bring 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. 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; comfortable writing clear specs and contributing actively in design reviews. Nice‑To‑Haves 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). Our Benefits Competitive base salary alongside attractive equity package. A monthly stipend to help you get to and from the office. Flexible PTO – take as much time as you need to recharge. Meals and snacks – lunch, dinner and snacks, provided daily. Your own personal Yoshi. #J-18808-Ljbffr Cartesia