How We Built a Smart Subscription Platform with AWS and Stripe

The challenge: Growing SaaS companies struggle with subscription complexity—trial management, billing automation, dunning flows for failed payments, and usage-based pricing. Manual processes lead to lost revenue and frustrated customers.

The Problem

A fast-growing B2B SaaS company was losing significant revenue due to manual billing and delayed invoicing. They used five different spreadsheets to track subscription states, couldn't scale trial management, and had no visibility into churn drivers.

"Every failed payment required manual intervention. We were leaving money on the table and customers were frustrated." — Finance Operations Lead

Our Solution

Skillzmist built a fully integrated subscription platform with two interfaces:

• Admin dashboard for managing subscription tiers, trial rules, discounts, and revenue analytics
• Customer portal for self-service billing management, payment method updates, and usage visibility

Architecture & Technical Decisions

We designed around Stripe as the source of truth for payments, with AWS handling application logic:

• Stripe billing engine handles recurring charges, retries, and dunning flows automatically
• AWS Lambda webhooks process Stripe events in real-time to update customer status
• PostgreSQL stores customer metadata, usage metrics, and billing history
• React + Redux provide a responsive, real-time admin experience
• Automated email notifications via SendGrid for invoices, upgrades, and renewal reminders

Technologies Used

Results & Impact

Financial impact in first year:

• Processes 100k+ transactions monthly with 99.9% success rate
• Automated dunning flows recover 25% more failed payments than manual retries
• Trial-to-paid conversion increased by 18% with automated reminders
• Customer portal adoption at 72%—reduces support requests by 40%
• Billing reconciliation reduced from 3 days to 2 hours

The finance team now spends 15 minutes per week on billing instead of 20+ hours. Customers have transparency into their usage and upcoming charges, reducing surprise-related cancellations.

Key Features That Drive Revenue

Smart dunning: Stripe automatically retries failed payments at optimal times, recovering 25% more failed charges.

Usage-based billing: Customers on premium plans are charged based on actual usage, ensuring fair pricing and predictable revenue.

Churn analytics: Dashboard shows which customers are at risk based on usage trends and engagement patterns.

Flexible trials: Teams can create different trial rules by customer segment and automatically convert to paid plans.

Lessons Learned

• Let Stripe handle complexity: Trying to build custom retry logic is a mistake. Stripe's dunning flows are battle-tested.
• Webhook reliability matters: Implement idempotent webhook handlers and a dead-letter queue for failed events.
• Transparency reduces churn: Customers who can see their usage and costs are less likely to cancel unexpectedly.

Why This Matters

For product-led SaaS companies, subscription automation directly impacts profitability. Each percentage point improvement in retention or payment recovery translates to significant revenue.

A well-built subscription platform gives finance teams confidence, reduces operational burden, and lets product teams focus on features instead of billing workflows.

Ready to Automate Your Billing?