Software Engineer, Billing

San Francisco · New York City · Seattle · Full-time · Posted Oct 13, 2026

At a glance

Braintrust is the agent observability platform. By actively applying intelligence to agent traces and automatically surfacing the most critical patterns, Braintrust gives teams the visibility to understand how agents behave in production and the tools to improve them.
Teams at Notion, Stripe, Box, OpenAI, and Cloudflare use Braintrust to trace their agents, find the issues in their observability data, and run evals that tell them how to improve.

We're looking for a Software Engineer, Billing to build the systems that make Braintrust's pricing, usage, and payments accurate, scalable, and transparent.
You'll work across the billing stack: usage metering, subscriptions and entitlements, payment integrations, invoicing, credits, and the internal systems that reconcile them.

Own Braintrust billing architecture end-to-end, including metering, plans, subscriptions, entitlements, invoices, credits and payments.
Design our billing architecture to solve immediate needs and simplify billing for new features as they are developed and released.
Ensure Braintrust accurately measures and bills for product usage, including processed data, evaluation scores, model usage, and data retention.
Partner with product, infrastructure, finance, and customer-facing teams to introduce new pricing models and billing workflows with confidence.
Build a reliable usage-metering and aggregation pipeline that turns product activity into accurate customer usage.
Build a subscription, limits, and entitlement system that supports plan allowances, feature access, trials, upgrades, and on-demand usage.
Build internal tools and APIs for investigating billing anomalies, issuing credits, and helping customers understand their account state.
Build observability across the billing pipeline, including metering lag, event completeness, reconciliation discrepancies, and payment health.

Expert-level understanding of TypeScript, Rust, SQL, backend systems, APIs, and distributed data-processing patterns
Experience building and operating production usage-based billing, payments, or subscription systems
Experience with metering, aggregation, idempotency, reconciliation, and event-driven architectures
Experience integrating with Stripe or similar payment infrastructure
Comfortable shipping end-to-end, from backend infrastructure and data systems to internal tools and customer-facing UI

Experience building or maintaining financial ledgers, credits, balances, or invoice systems is a plus
Previous experience founding or working at startups is a plus