Numeral (YC W23)

Foundational AI Engineer

Numeral (YC W23)

full-time

Posted on:

Location Type: Hybrid

Location: San FranciscoCaliforniaUnited States

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Salary

💰 $175,000 - $300,000 per year

Job Level

About the role

  • Design, build, and operate production AI systems, including tool-calling agents, model orchestration layers, and RAG.
  • Implement and maintain AI integrations using modern frameworks, MCP servers, and external model providers.
  • Build and evolve scalable backend services and APIs that power automated workflows and customer-facing features.
  • Think in automation and workflows: design systems using tools like n8n, Claude Code-style agents, or similar orchestration approaches where appropriate.
  • Make architectural decisions that balance latency, cost, reliability, and iteration speed.
  • Own infrastructure, observability, and performance for both AI and non-AI services.
  • Collaborate closely with product, design, and data teams to ship features that solve real customer problems.
  • Help define engineering best practices, AI safety/reliability norms, and our overall technical culture.

Requirements

  • 7+ years of experience building products in high-growth environments.
  • 2+ years of experience building with LLMs.
  • Avid use of state-of-the-art AI development tools such as Cursor and Claude Code.
  • Fluency with backend technologies like PostgreSQL, Redis, and cloud services (AWS preferred).
  • Experience with frontend development, especially TypeScript and its ecosystem.
  • Strong product sense, balancing performance, flexibility, and speed.
  • Comfortable working in dynamic startup environments with evolving needs.
  • Excellent communication and collaboration skills.
Benefits
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Applicant Tracking System Keywords

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Hard Skills & Tools
AI systemsmodel orchestrationbackend servicesAPIsautomationLLMsPostgreSQLRedisTypeScriptcloud services
Soft Skills
communicationcollaborationproduct senseadaptabilityproblem-solving