Backend Engineer, AI

Rain is a global stablecoin payments platform for enterprises, neobanks, platforms, developers, and AI agents. The Backend Engineer, AI will build and scale backend systems, APIs, data pipelines, and shared AI infrastructure while delivering AI-powered features, agents, and automation for Rain’s core platform.

Responsibilities

• 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

Preferred

• 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
• Eval framework design
• AI quality measurement
• Fintech experience
• Internal tools development
• Platform systems experience

Benefits

• Unlimited vacation, with a requirement for Rainmakers to take a minimum of 10 days for themselves
• Flexible workplace: work from home, come into an office, or both
• New Rainmakers receive a stipend to set up a comfortable home workspace
• For US Rainmakers, 95% coverage of health, dental, and vision plan costs and 90% coverage for dependents
• For US Rainmakers, a 100% company-subsidized life insurance plan
• 401(k) with a 4% company match
• Every Rainmaker gets an equity option plan
• Monthly stipend for eligible health and wellness spending, including gym memberships, fitness classes, massages, and acupuncture
• Rainmakers working from the office receive lunch and dinner covered with a DoorDash credit
• Team and company offsites, both domestic and international

Company

• Enterprise stablecoin-powered card and payments infrastructure platform
• New York, New York, USA
• https://www.rain.xyz/
• Founded in 2021
• 51-200 employees

Qualifications

• 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
• 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

Required skills

• AI Agents, Backend Systems, Eval Framework Design, Fintech, LLM Tool Calling, Large Language Models (LLMs), Node.js, Prompt Architecture, Retrieval Patterns, Structured Outputs

Experience

• 3+ years