Interview Questions/System Design/Design a Subscription Billing System
IntermediateSystem-Design
30 min

Design a Subscription Billing System

BillingPaymentsFinance
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Interview Question

Design a recurring billing system with plan management, invoicing, dunning, and proration.

Key Points to Cover
  • Subscription plans: upgrades, downgrades, trials
  • Invoicing: tax, discounts, credits, proration
  • Payments: retries, dunning, failed payment handling
  • Ledger and reconciliation processes
  • Integrations: ERP, reporting, revenue recognition
Evaluation Rubric
Flexible subscription plan model25% weight
Accurate invoicing and proration25% weight
Robust dunning and retry strategy25% weight
Reliable ledger and reconciliation25% weight
Hints
  • 💡Handle mid-cycle plan changes carefully.
Potential Follow-up Questions
  • How to support usage-based billing?
  • How to handle international tax compliance?
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