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Working on different systems lately:
• Stripe payments (subscriptions + webhooks)
• Zoho CRM ↔ Firebase sync
• Multi-tenant SaaS backend
• GraphQL APIs
Different projects, same pattern:
Most effort goes into handling edge cases.
• duplicate events
• partial failures
• inconsistent data
• retries
The “happy path” is easy.
Making the system reliable is the real work.
#backend #apis #systemdesign
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