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Research Engineer, Data Infrastructure (Language Modeling)

Cartesia· Research
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*HQ - San Francisco, CA$200k - $350kFull-timePosted 3w ago

About the role

Data infrastructure specialist to build datasets and systems powering pretraining for Cartesia's language models, including scalable data pipelines, data loading/versioning, and collaboration with research to optimize data quality and mixture composition.

Responsibilities

  • Build and operate performant, scalable data processing infrastructure for acquiring, ingesting, and combining massive text datasets.
  • Design and operate scalable, high-throughput, and reproducible data pipelines — covering ingestion, preprocessing, filtering, deduplication, and augmentation.
  • Design and run ablation experiments to understand how data sources, processing choices, and mixture weights affect model quality.
  • Partner closely with research and infrastructure teams to co-design data loading, versioning, and experimentation pipelines.
  • Establish and enforce rigorous standards for data quality, with a tight feedback loop between dataset characteristics and model behavior.
  • Identify and source novel datasets; manage relationships and budgets with external data vendors and partners.

Qualifications

  • Hands-on experience with ML data infrastructure: training data pipelines, dataset versioning, large-scale data loading, and the interplay between data systems and model training and inference.
  • Strong modern engineering execution: clean, well-tested code, fluency with current tools, and a willingness to pick the right tool for the problem rather than defaulting to familiar patterns.
  • Familiarity with building and evaluating datasets for generative models and reasonable working knowledge of how they're trained and inference.

Skills

Required:ML data infrastructureSoftware engineeringDataset construction for generative models

Benefits

  • 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
  • 401(k)
  • Commuter Allowance: A monthly stipend to help you get to and from the office.
  • Flexible PTO
  • Meals & Snacks: Lunch, dinner and plenty of snacks, provided daily.
Last updated Sep 30, 2026. Interested? Apply on the company site.

About Cartesia

Real-time TTS API with AI laughter and emotion

Cartesia offers Sonic-3, a streaming text-to-speech API capable of generating natural, expressive voices with laughter in 40+ languages—built for AI agents and interactive applications.

AI voicesinteractive appsliquid-ai-recruiting-targetmultilingualstreaming APItext-to-speechvoice-ai-stack
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