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Sanity Logo

Sr. Full Stack Engineer, New Venture

Sanity

$220,000 - $255,000
Oct 28, 2025
Remote, US
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Sanity.io is looking to solve the problem of how machines can truly understand and use human-created content by building systems that structure and enrich large volumes of information to enable AI agents and LLMs to access the right context at the right time.

Requirements

  • Deep expertise in Node.js and React.js (our core tech stack).
  • Hands-on experience with LLM APIs or AI-powered applications, including building evaluation pipelines and designing metrics for performance testing and evaluation.
  • Strong architectural design skills; you are able to create scalable, structured systems that support clean APIs and rich data models.
  • Bonus points if you’re comfortable with Python (for data/ML tasks).
  • You're excited about augmenting your own work with AI, whether it’s using tools like Cursor, GitHub Copilot, or building custom workflows.

Responsibilities

  • Design and build AI-driven features and agents that revolutionize how content is created, structured, and delivered.
  • Leverage LLMs to analyze unstructured content (e.g. plain text) and infer structured data and metadata, making content more organized and “AI-ready.”
  • Collaborate with design and product to prototype intuitive user experiences that blend AI automation with human oversight, iterating on feedback to get it just right.
  • Apply emerging AI and ML research, from prompt engineering to dataset optimization, to create scalable, reliable product features.
  • Stay at the forefront of LLM research, understanding model behaviors, limitations, and capabilities to inform system design decisions.
  • Write clean, maintainable, well-tested code.
  • Contribute to team best practices for AI development, ensuring solutions are robust and sustainable at scale.

Other

  • Based in the San Francisco Bay Area and able to work at least 2 days per week in our San Francisco office.
  • 5+ years of software engineering experience, ideally building user-facing products.
  • A naturally curious and creative problem solver who loves to experiment and learn new technologies.
  • Collaborative and communicative. You work well in a team, share ideas, and can explain complex concepts clearly. You enjoy cross-functional collaboration.
  • Comfortable with ambiguity and excited about working on undefined problems that require creative solutions.