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Karumi (YC F25) Logo

Product Engineer (Full-Stack)

Karumi (YC F25)

Salary not specified
Dec 4, 2025
San Francisco, CA, US
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Build features that directly impact how customers experience and adopt our platform, making architectural decisions across the entire stack.

Requirements

  • Strong full-stack development experience (frontend + backend)
  • Proficient in React and modern JavaScript/TypeScript
  • Python skills with FastAPI or similar frameworks
  • Experience with PostgreSQL, Redis, and async patterns
  • Comfortable with AWS/Azure/GCP, deployment pipelines, and infrastructure basics
  • Experience building with LLMs and AI-powered features
  • Browser automation or headless browser technologies

Responsibilities

  • Build full-stack features from UI components to backend services
  • Design and implement responsive, intuitive user interfaces with React
  • Develop high-performance APIs using FastAPI and async Python
  • Work with LLM integrations, prompt engineering, and AI-powered workflows
  • Deploy and monitor features across our AWS infrastructure
  • Gather user feedback and iterate rapidly on what you ship

Other

  • We sponsor visas for qualified candidates.
  • Product mindset - you care about user experience and customers, not just code
  • Design sensibility and attention to UI/UX details
  • Previous startup or 0-to-1 product experience
  • Visa sponsorship available