Software Engineer, Product

Cartesia; San Francisco (CA); On-site; USD 120,000 - 150,000; Full time

Job summary

A pioneering AI company in San Francisco is seeking a Software Engineer to build and scale platform infrastructure for voice AI products. The role involves creating platform components, owning core infrastructure, and collaborating with product teams. Ideal candidates should have over 3 years of backend engineering experience, customer outcome focus, and familiarity with TypeScript, Python, and Go. A supportive and fast-paced team environment is emphasized.

Qualifications

• 3+ years of experience as a backend or platform engineer.
• Ability to navigate ambiguous problems to deliver results.
• Comfort across technology stack including TypeScript, Python, and Go.

Responsibilities

• Build and scale product platform components.
• Own critical product infrastructure end-to-end.
• Work with product teams to identify shared needs.

Skills

Building scalable systems

Customer outcome focus

Problem solving

Strong judgment on scalability

TypeScript

Python

Go

Tools

PostgreSQL

Redis

NATS

Datadog

Prometheus

OpenTelemetry

Job description

About Cartesia

Our mission is to build the next generation of AI: ubiquitous, interactive intelligence that runs wherever you are. Today, not even the best models can continuously process and reason over a year-long stream of audio, video and text—1B text tokens, 10B audio tokens and 1T video tokens—let alone do this on-device.

We're pioneering the model architectures that will make this possible. Our founding team met as PhDs at the Stanford AI Lab, where we invented State Space Models or SSMs, a new primitive for training efficient, large-scale foundation models. 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.

About the Role

Cartesia is hiring a Software Engineer, Product to build and scale the platform infrastructure that powers Cartesia's voice AI products. You'll code composable platform components that accelerate feature delivery across our API and conversational AI systems.

Your Impact

• Build and scale product platform components to support Cartesia's growth.

• Own critical product infrastructure end-to-end, such as realtime infra.

• Work alongside product teams to identify shared needs and build platform primitives that multiply their velocity.

What You Bring

• 3+ years of experience as a backend or platform engineer building scalable systems.

• You think in terms of customer outcomes, not just technical requirements.

• Enjoy full ownership of your work, and effectively navigate ambiguous problems to deliver results.

• Strong judgment on when to move fast and when to invest in scalability.

• Comfort across our stack: TypeScript on the frontend, Python + Go on the backend. You don't need to be an expert in all three, but you're not afraid of any of them.

Nice-to-Haves

• Each of these is a plus, but not required to qualify for the role.

  • Experience with PostgreSQL, Redis, NATS, or similar data and messaging systems at scale.

  • Familiarity with real-time streaming systems, or WebRTC.

  • Background in observability infrastructure (Datadog, Prometheus, OpenTelemetry) and building internal tooling for debugging production systems.

Our Culture

🏢 We’re an in-person team based out of San Francisco. We love being in the office, hanging out together, and learning from each other every day.

🚢 We ship fast. All of our work is novel and cutting edge, and execution speed is paramount. We have a high bar, and we don’t sacrifice quality or design along the way.

🤝 We support each other. We have an open & inclusive culture that’s focused on giving everyone the resources they need to succeed.