Software Engineer, Full Stack (Agent Platform) at Sapiom

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers.She will pick the best candidates from Jack's network.The next step is to speak to Jack.Job TitleSoftware Engineer, Full Stack (Agent Platform)SalaryNot DisclosedCompany DescriptionSapiom is a $50M Series A platform building the "spine" for AI agents, providing the infrastructure needed for machines to act in the world. Backed by Dragonfly, Accel, and Anthropic, Sapiom unifies compute, identity, and spend controls into an operating system for the next generation of agentic products.Job DescriptionYou will build the core machinery for agent production, owning end-to-end systems like real-time model routing and high-scale billing ledgers. At Sapiom, full-stack means owning the interface that gives customers granular control over their agents' authority. This is a high-stakes role where reliability and correctness are paramount as you scale.LocationSan Francisco, USAWhy this role is remarkableJoin an elite team with deep infrastructure DNA; the founder previously led payments engineering at Shopify for five years and built autonomous agent companies.Work at the frontier of AI infrastructure with $50M in funding from premier investors including Accel, Dragonfly, Menlo Ventures, and Anthropic.Own mission-critical systems where being wrong is expensive, building the routing engine and ledger handling 270M+ consumption events for leading agentic companies.What You Will DoArchitect real-time routing systems that place model calls against latency and cost targets, enabling customers to run agents economically at scale.Develop high-fidelity metering and billing systems that reconcile millions of events, ensuring absolute correctness in both internal ledgers and customer-facing dashboards.Build the control plane for agent authority, designing credential-scoped permissions and hardening gateways to safely hand power to autonomous machine agents.The ideal candidateHas 4-7 years of professional experience owning production systems end-to-end, particularly in high-stakes environments like billing, payments, or financial ledgers.Demonstrates a mastery of designing for failure, with hands-on experience managing timeouts, retries, and idempotency in complex, high-traffic distributed systems.Possesses a true full-stack mindset, capable of building the sophisticated interfaces that sit on top of their own back-end infrastructure to provide user control.Who are Jack & Jill?Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.How does this work?Jack's an AI agent for job searching and career coaching. He works for you.Jill is the AI recruiter working for the company. She recruits from Jack's network.If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.We never post fake jobsThis isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network.Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description.We appreciate this can make them look a bit suspect, but there isn't much we can do about it.Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.