Multi-Tenant SaaS Billing & Usage
Usage metering, tiered subscriptions, and provider-agnostic billing for a multi-tenant SaaS, accurate to the event and reconciled automatically.
Billing accuracy
99.99%
Event-accurate metering
100%
Manual reconciliations
0
The challenge
A SaaS product had outgrown flat pricing; usage-based billing was a spreadsheet nightmare: 200+ manual invoice adjustments per month, 5% revenue leakage from metering gaps, and 3-day close cycles. They needed event-accurate metering, tiered plans, and self-reconciling billing.
What we built
We modelled usage as an append-only event stream metered in real time, layered tiered subscription logic on top, and abstracted billing behind an idempotent gateway so charges and credits reconcile automatically.
The outcome
Billing is accurate to the event, usage is metered in real time per tenant, and monthly manual reconciliation was eliminated entirely.
Stack
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Start a projectHow it's built
Usage is an append-only event stream on Kafka; invoices are a re-derivable projection, never hand-edited.
Tiered subscription and proration logic is modelled explicitly, not encoded in ad-hoc queries.
The billing gateway is idempotent so retries and webhooks can never double-charge.
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