Multi-lingual Data Specialist

Cartesia

Cartesia

IT
San Francisco, CA, USA
USD 180k-250k / year + Equity
Posted on Sep 16, 2025

Location

HQ - San Francisco, CA

Employment Type

Full time

Location Type

On-site

Department

Staff

Compensation

  • $180K – $250K • Offers Equity

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.

The Role

To build truly global AI, our models must be trained on data that reflects the world's diversity of languages and cultures. We are searching for a Multi-lingual Data Specialist to own the quality and coverage of our multi-lingual models. You will be our in-house expert on global data, ensuring our models perform exceptionally well across dozens of languages. You have a keen eye for linguistic nuance, and a passion for building inclusive and representative datasets at scale.

What you’ll do

  • Design and build large-scale multilingual datasets for model training.

  • Build evaluations of multilingual speech models, both via manual annotation and at scale with automated metrics.

  • Partner with product teams to ensure support for key languages and markets.

What we’re looking for

  • Experience building or working with large multilingual datasets

  • Experience evaluating generative models across multiple languages.

  • Ability to help guide human annotation and evaluation across multiple languages.

  • Familiarity with the nuances of multi-lingual speech is preferred.

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 everyday.

🚢 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 and design along the way.

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

Our perks

🍽 Lunch, dinner and snacks at the office.

🏥 Fully covered medical, dental, and vision insurance for employees.

🏦 401(k).

✈️ Relocation and immigration support.

🦖 Your own personal Yoshi.

Compensation Range: $180K - $250K