Software Engineer, Money Platform

OpenRouter · Remote, United States

About OpenRouter

OpenRouter is the leading AI routing and infrastructure layer that enterprises use to access, manage, and optimize the best large language models across providers—without lock-in, capacity constraints, or unnecessary cost. We power the most advanced AI teams in the world by giving them the flexibility to move fast, scale confidently, and stay future-proof as models evolve.
As enterprise adoption of AI accelerates, OpenRouter sits at the center of how organizations operationalize LLMs across research, product, and production workloads.
Every token that flows through OpenRouter is a financial event. Billions of requests run across hundreds of models and dozens of providers, and each request carries its own cost, price, discount and contract terms. Behind the inference engine sits a money engine: metering, pricing, invoicing, credits, payments, payouts and the ledger that ties it all together.
You will be responsible for the robust and flexible platform that lets the business sell any pricing model it can dream up. If you come from fintech and have a passion for financial engineering, this is your chance to reimagine an AI-first, agentic Money Platform from the ground up.
Flexible pricing and contract terms.

Any commitment size, BYOK pricing, overages, platform fees and per-seat pricing. Automate quote-to-cash.

Take a signed contract straight to a provisioned, correctly billed customer with no manual uploads. Build credit transfers at onboarding and self-serve credit grants for CS into our own tools.
Financial core that owns fees, plans and entitlements. Establish robust data architecture for internal and customer reporting.
Every completed request is metered, priced and recorded exactly once, across our streaming spend-tracking pipeline and usage records. Reconcile what we served against what we charged.
Own billing, payments & collections.

That means invoicing, prepaid credits, auto top-ups, refunds, tax/VAT, POs and spend-against-commitment tracking. It also covers the Stripe integration, failed-payment recovery and overdue-invoice collections.
Build the ledger, AP & reconciliation.

Build a double-entry ledger as the financial system of record. Automate reconciliation across Postgres, Stripe, billing and usage data. Partner closely with the Provider team on usage tracking, per-generation cost attribution and provider pricing/discounts, and with the Trust & Safety team on payments fraud and abuse prevention.
The system ensures idempotency of financial transactions, anomaly detection, auditability and least-privilege access for finance tools. 5+ years building production financial systems: billing, payments, ledgers or revenue infrastructure, at a fintech or a usage-based SaaS company.
~ Deep fluency in money-correctness patterns: idempotency, double-entry accounting, exactly-once event processing, reconciliation and safe migrations of financial data.
~ Hands-on experience with Stripe (or similar processors) and a billing/invoicing platform, including contract, subscription and usage-based models.
~ Strong TypeScript and SQL. You can talk with Finance in their language.
~ High agency and AI-forward. Experience with streaming data pipelines (e.g. Experience with payments fraud and risk systems (e.g. Experience with multi-currency, sales tax/VAT or global payment methods.
Youve helped get financial systems ready for an audit.
Youre an existing OpenRouter user, or have built projects in AI tooling.