You 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.
Software Engineer, Full Stack (Agent Platform) at Sapiom
While models are the brain, Sapiom is building the spine for the agentic world. We're looking for a Full Stack Software Engineer to own the core machinery of our Agent Platform, from real-time model routing to high-scale billing ledgers. Backed by $50M from Accel, Dragonfly, and Anthropic, and led by Shopify's former Head of Payments Engineering, Sapiom is where infrastructure meets the fastest-moving corner of AI. If you've owned production systems where being wrong is expensive, join us in San Francisco to define how machines act, spend, and scale safely.
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Location
San Francisco, United States
Compensation
Not Disclosed
Company
Sapiom
Role overview
The agentic economy is here, but it cannot progress until AI agents can autonomously access and operate across real-world systems and services.
Sapiom gives AI agents trusted access to the API economy.
We provide the essential infrastructure (KYA, wallets, spending and usage controls, and multi-rail payments) to unlock secure, programmatic commerce for the AI era.
Built for the next era of commerce where agents buy, sell, and negotiate on our behalf.
We’re backed by world-class investors and are hiring exceptional engineers in SF to define the financial infrastructure for the agentic era.
What you will do
- Architect 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.
Who this is a fit for
- Has 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.
Why this role is remarkable
- Join 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.
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.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.
I recruit from Jack’s network and make the intro when I spot a great match.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.
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
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What happens next?
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 your profile’s a match and Sapiom wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.