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Software Engineer, Billing

Braintrust· Engineering
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San Francisco, New York City, SeattleFull-timePosted 1w ago

About the role

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 own the billing architecture end-to-end and work across metering, subscriptions, entitlements, invoicing, credits, and payments to deliver reliable customer experiences.

Responsibilities

  • 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 the systems that power Braintrust billing, such as: - A reliable usage-metering and aggregation pipeline that turns product activity into accurate customer usage. - A subscription, limits, and entitlement system that supports plan allowances, feature access, trials, upgrades, and on-demand usage. - Internal tools and APIs for investigating billing anomalies, issuing credits, and helping customers understand their account state. - Observability across the billing pipeline, including metering lag, event completeness, reconciliation discrepancies, and payment health.

Qualifications

  • 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
  • Experience building or maintaining financial ledgers, credits, balances, or invoice systems is a plus
  • Comfortable shipping end-to-end, from backend infrastructure and data systems to internal tools and customer-facing UI
  • Previous experience founding or working at startups is a plus
  • Has an appreciation for the tension between moving quickly and preserving customer trust and billing correctness

Skills

Required:TypeScriptRustSQLBilling systemsMetering and aggregationStripe integration

Benefits

  • Medical, dental, and vision insurance
  • Daily lunch, snacks, and beverages
  • Flexible time off
  • Competitive salary and equity
  • Wifi & cellphone stipend
Last updated Oct 18, 2026. Interested? Apply on the company site.
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About Braintrust

Ship quality AI at scale

Braintrust is the AI observability platform for tracing production, running evals, and catching regressions before they reach users.

AI debuggingAI development platformAI evaluationAI evaluation frameworkAI monitoringAI observabilityAI performance testingAI testing
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