Software Engineer, Product
Cartesia · *HQ - San Francisco, CA
About this role
## About Cartesia Cartesia’s mission is to architect AI that learns from and interacts with the world like humans do. We’re pioneering model architectures that make this possible—building on State Space Models (SSMs), a new primitive for training efficient, large-scale foundation models. We combine model innovation and systems engineering with design-minded product engineering to build and ship cutting-edge models and experiences. We’re funded by leading investors including Index Ventures and Lightspeed Venture Partners, along with Factory, Conviction, A Star, General Catalyst, SV Angel, Databricks, and others. ## About the Role Cartesia builds real-time multimodal intelligence—fast, state-of-the-art voice models and the products that make them useful. Starting as a research lab, we now bring our research to customers through intuitive tools for creating, testing, and shipping with voice. In this role, you’ll build product experiences around Cartesia’s models. You may work across **Voices**, **Playground**, and other core surfaces as priorities evolve. You’ll own work end-to-end and directly shape the quality, usability, and developer experience of how customers discover our models, understand what they can do, and put them into production. ## Your Impact - Build polished, intuitive experiences across **Voices**, **Playground**, and adjacent product surfaces—turning powerful model capabilities into workflows customers can understand and use. - Own customer problems end-to-end, from discovery and prototyping through implementation, launch, measurement, and iteration. - Improve the speed and confidence with which customers can evaluate, configure, and integrate Cartesia’s voice models. - Define how product quality is measured by building analytics, evaluations, experiments, and regression tracking to reveal where experiences succeed or break down. ## What You Bring - Experience building and operating customer-facing software 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 outcomes, usability, quality, and developer experience—and you have opinions on what to build and why. - Full-stack range and the ability to own a product surface across frontend, backend, APIs, data, and operational concerns. - Fluent use of coding agents and a habit of keeping pace with the frontier. - Clear communication with technical and non-technical audiences, strong cross-functional partnership, and a sharp presence in product and design reviews. ## Nice-to-Haves - Experience building developer tools, creative tools, playgrounds, or API-adjacent products. - Experience building AI-powered products and translating model capabilities, limitations, and quality tradeoffs into understandable user experiences. - Strong frontend craft with **React** and **TypeScript**, including polished, highly interactive workflows. - Experience with audio, media, real-time systems, product analytics, experimentation, or evaluation infrastructure. ## More Details - **In-office policy:** In-person team based out of **San Francisco (🇺🇸)**, **London (🇬🇧)**, and **Bangalore (🇮🇳)**. - **Visa sponsorship:** Provided on a case-by-case basis; your recruiter will discuss needs on the first call. - **Execution:** We ship fast—novel, cutting-edge work with a high bar for quality and design. - **Culture:** Open & inclusive, focused on giving everyone the resources
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