All case studies
FintechConfidential — Fintech·22 weeks
Usage-based billing engine for a B2B fintech
Metered billing, invoicing, and revenue analytics, rebuilt
Overview
Engineered a high-throughput usage-based billing system handling metering, plan logic, dunning, and revenue analytics for thousands of B2B accounts.
Challenge
Legacy billing couldn't model usage tiers, leaked revenue on edge cases, and blocked product-led growth experiments.
Solution
Built an event-sourced billing core with idempotent metering, audit-grade ledgers, plan versioning, and a Stripe-integrated invoicing layer.
Outcome
Unblocked monetization experiments, eliminated leaked revenue, and reduced finance reconciliation effort dramatically.
Highlights
- Event-sourced billing core
- Plan versioning & retro-billing
- Stripe invoicing integration
- Finance-grade audit trail
Stack
Node.jsTypeScriptPostgresKafkaStripeKubernetes