Service A calls Service B synchronously. Service B calls Service C. Service C calls Service A. Now a deploy to any of them requires coordinating all three. A bug in Service B takes down Services A and C. This isn''t microservices — it''s a distributed monolith.
Your server is in UTC. Your database is in UTC. Your cron job runs at "9 AM" — but 9 AM where? Customer in Tokyo and customer in New York both get charged at your server''s 9 AM. Your "end of day" reports include data from tomorrow. Timezone bugs are invisible until they''re expensive.
Your marketing team runs a campaign. It goes viral. Traffic spikes 50x in 10 minutes. Your servers crash. This is the happiest disaster in tech — and it''s entirely preventable. Here''s how to build systems that survive sudden viral traffic spikes.