SaaS Billing & Subscription Platform

A B2B SaaS company had manual billing processes causing revenue leakage and customer churn from billing failures.

Built a fully automated billing engine integrating Stripe with dunning management, proration, and real-time invoicing.

Next.js 14 frontend, Node.js microservice backend, PostgreSQL with Prisma ORM, deployed on AWS ECS with Redis caching.

Handling concurrent plan upgrades without double-billing, implementing idempotent payment webhooks, and building a multi-currency invoicing system.

Reduced billing-related churn by 34%, automated 100% of invoice generation, and cut billing support tickets by 78%.