Software Engineer, Billing

SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today, SpaceX is actively developing the technologies to make this possible, with the ultimate goal of making life multiplanetary and expanding consciousness to the stars.

SpaceXSI is building Super Intelligence to help humanity understand the universe. Our teams are building the full Super Intelligence stack: from our Colossus supercomputers, to Grok models, to our suite of applications, including Grok Bot, Grok Build, Grok Imagine, Grok Voice, and X. We're creating a powerful flywheel where more compute trains better models, better models power more useful products, and what we learn from people using those products shapes what we build next. SOFTWARE ENGINEER, BILLING We're hiring a Software Engineer, Billing to evolve the systems that power how Cursor charges and reconciles revenue across millions of developers and enterprise teams. You will work across the billing stack, usage metering pipelines, subscription and entitlement systems, payment integrations, and the ledger layer, to make billing accurate, scalable, and transparent. This is a deeply technical IC role. It is not a finance ops role, and it is not a backend generalist role wearing a billing hat.

RESPONSIBILITIES:

• Implement usage and billing systems changes end-to-end, from updates in the UI and raw usage events at the edge to invoiced amounts in Stripe, including the metering pipeline, aggregation logic, entitlement enforcement, and ledger

• Evolve our ledger system that serves as the source of truth for customer balances, credits, overages, and adjustments, with the correctness guarantees that financial systems require

• Integrate deeply with Stripe including subscriptions, usage records, invoices, webhooks, and edge cases like mid-cycle plan changes, prorations, and failed payment recovery

• Build billing APIs and internal tooling that product, finance, and customer success teams depend on to query customer state, issue credits, and investigate billing anomalies

• Improve observability across the billing pipeline, metering lag, reconciliation discrepancies, invoice accuracy, so the team can quickly detect and debug billing regressions

• Partner with product, infrastructure, and finance teams to ship new pricing models with confidence and minimal operational risk

BASIC QUALIFICATIONS:

• Experience shipping a usage-based billing system in production or working on billing systems in general.

PREFERRED SKILLS AND EXPERIENCE:

• Opinions on metering architecture, idempotency, and exactly-once semantics

• Experience shipping a usage-based billing system in production and opinions on metering architecture, idempotency, and exactly-once semantics

• Experience integrating deeply with Stripe, understanding its data model, and dealing with erroring webhooks

• Experience building or maintaining a financial ledger and understanding why it's required

• Care about correctness and making sure customers don't have to manually review their invoices

• Able to hold the tension between "move fast" and "do not lose revenue or trust."

• Feel comfortable shipping features end-to-end, from scaling up infrastructure to tweaking a UI component

ADDITIONAL REQUIREMENTS:

• Onsite role: must be able to work in person at the San Francisco or New York office

COMPENSATION AND BENEFITS: The annual compensation range for this role is listed below. Annual Salary: $140,000 - $225,000 USD Your actual level and base salary will be determined on a case-by-case basis and may vary based on the following considerations: job-related knowledge and skills, education, and experience. Base salary is just one part of our total rewards package at SpaceXSI, which also includes equity, comprehensive medical, vision, and dental coverage, access to a 401(k) retirement plan, short & long-term disability insurance, life insurance, and various other discounts and perks.