Backend Engineer, AI

About the Company Rain is the global stablecoin payments platform for enterprises, neobanks, platforms, developers, and AI agents. Our technology allows partners to move, store, and use stablecoins instantly and compliantly through global payment cards, rewards, on/offramps, wallets, and cross-border rails. As both a Visa and Mastercard Principal Member, Rain issues cards that work at more than 175 million merchant locations in over 220 countries and territories. Built natively for stablecoins and trusted by more than 100 organizations worldwide, Rain delivers secure, scalable infrastructure that makes money move freely and instantly around the world. You will have the opportunity to deliver massive impact at a hypergrowth company backed by some of the top investors in fintech, crypto, and SaaS. In January 2026, we closed a $250M Series C led by ICONIQ, valuing Rain at $1.95B, with Sapphire Ventures, Dragonfly, Bessemer Venture Partners, Galaxy Ventures, FirstMark, Lightspeed, Norwest, and Endeavor Catalyst also participating. If you're curious, bold, and excited to help shape a borderless financial future, we'd love to talk. Our Ethos We believe in an open and flat structure. You will be able to grow into the role that most aligns with your goals. Our team members at all levels have the freedom to explore ideas and impact the roadmap and vision of our company. About the T [... source excerpt omitted ...] t make our operations smarter and customer-facing infrastructure at the intersection of AI agents, fintech, and stablecoins, including some of the first agentic payment systems in production. If you want to shape how AI gets built into a payments company, this is 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 W [... source excerpt omitted ...] dded 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 ge