6+ years building production backend systems, of which 3+ years actively building and operating billing or metering systems in production
Hands-on experience with usage-based / metered billing: rating, aggregation, and proration logic
Hands-on experience with subscription / recurring billing alongside usage-based models
Hands-on experience with prepaid credits / wallet systems and auto top-up mechanics
Hands-on experience with enterprise / contract billing: custom pricing and negotiated terms
End-to-end integration of a third-party billing platform (Stripe Billing, Metronome, Orb, or Zuora)
Strong expertise in Python and TypeScript/Node (Go a plus)
Production experience with transactional databases (Postgres or equivalent) for financial-grade data
Built high-volume event / usage pipelines into a data warehouse (Kafka or Kinesis → Snowflake or BigQuery)
Owned billing correctness in production: reconciliation, idempotency, invoice accuracy
Product-Led Growth (PLG) experience: worked on billing for high-volume, self-serve users
Hands-on with Auth0, Okta, or similar identity systems in production
Shipped revenue systems under SOX or financial audit constraints
Led a billing system migration or re-platform with zero revenue loss or downtime
Built hybrid billing combining usage, subscriptions, and prepaid in one system
Worked across both a payments layer (Stripe) and a metering / rating layer (Metronome / Orb)
Billed a developer-facing / API product with pay-as-you-go and API-key metering
Used Snowflake for usage aggregation and revenue analytics