Software Engineer, Money Platform

The role

You will build and own the money engine behind OpenRouter's inference gateway and agentic products. This includes developing systems for metering, pricing, invoicing, payments, and the ledger.

What you will do

• Develop flexible pricing and contract terms.
• Automate quote-to-cash processes.
• Define the financial core for fees, plans, and entitlements.
• Establish data architecture for internal and customer reporting.
• Manage usage to revenue processes including metering and pricing.
• Reconcile served usage against charges.
• Own billing, payments, and collections including Stripe integration.
• Build a double-entry ledger and automate reconciliation.
• Manage provider settlements and payables.
• Partner cross-functionally with Provider, Trust & Safety, Sales, CS, and Finance teams.

Required qualifications

• 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.
• Comfortable with Postgres and analytical stores (ClickHouse or similar) at high event volume.
• Working knowledge of accounting: AR/AP, revenue recognition, deferred revenue, month-end close.
• Ability to work well across teams.
• High agency and AI-forward.
• Use coding agents daily and like automating away manual finance ops.

Nice to have

• Built usage-based, hybrid or seat-based billing at scale.
• Experience with streaming data pipelines (e.g. Dataflow, Spanner, Kafka) for metering.
• Experience with payments fraud and risk systems (e.g. Stripe Radar).
• Experience with multi-currency, sales tax/VAT or global payment methods.
• Helped get financial systems ready for an audit.
• Existing OpenRouter user, or have built projects in AI tooling.

About the company

OpenRouter is the leading AI routing and infrastructure layer that enterprises use to access, manage, and optimize large language models across providers.