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System Design Masterclass · Cloud Infrastructure
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A team at a mid-size fintech company had 40 microservices. Each service needed to handle retries when calling other services, implement circuit breakers, enforce mutual TLS, collect latency metrics, and manage traffic routing for canary deployments. Every team implemented these concerns differently. Some services retried three times, others five. Some had circuit breakers, others crashed in a cascade. When a new compliance requirement mandated encryption for all internal traffic, 12 teams had to update their code independently.
The problem was clear: every service was solving the same infrastructure problems in its own way, and the inconsistency was causing outages.
A service mesh moves all of this out of application code and into the infrastructure layer. Your services just make calls. The mesh handles retries, encryption, observability, and traffic management transparently. One configuration change applies to all 40 services simultaneously.