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RainRainNew York, NY

Backend Engineer, AI

Builds and scales backend systems, APIs, and data pipelines for AI-powered features, agents, and automation in a fintech payments platform using stablecoins. Requires 3-8+ years experience with Node.js and production LLM systems.

Salary not listed
Hybrid3+ YOEBackend Engineering

About the role

What You'll Do

  • Be a critical part of the technical and product roadmap
  • Build and scale the backend systems, APIs, and data pipelines that power Rain
  • Design and ship AI-powered features, agents, and automation into our core platform
  • Build shared AI infrastructure: composable tool interfaces, eval frameworks, and permission-aware data access
  • Rapidly ship new capabilities to our customers and internal teams
  • Work embedded with the business, understand the workflows you're building for firsthand

What We're Looking For

  • Experience with Node.js and other backend technologies
  • 1–3+ years building production systems that use LLMs, tool calling, structured outputs, prompt architecture, retrieval patterns
  • A builder mentality, someone who experiments with side projects
  • Comfortable with ambiguity, you can take a loosely defined problem, make decisions, and ship
  • This position is for folks with 3–8+ years of experience, compensation will be based on experience

Nice to Have

  • Eval framework design, building systematic ways to measure AI quality
  • Fintech experience (neobank or card issuing experience gets extra brownie points)
  • Experience building internal tools or platform systems at a growth-stage company

Skills

Node.jsLLMsTool CallingStructured OutputsPrompt ArchitectureRetrieval PatternsAPIsData PipelinesEval FrameworksFintech

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