Every previous post in this series has been quietly leading here. The moment you spread a system across more than one machine — replicas, shards, multiple services — you're doing distributed systems, and distributed systems have their own laws of physics. This final part is about those laws: why the network will betray you, what the CAP theorem really forces you to choose, and how message queues and microservices help you cope.
This wraps up my system design fundamentals series.
I am a Software Engineer and Lead Project Manager at Sparkout Tech Solutions Pvt Ltd. I enjoy turning complex problems into simple, beautiful, and intuitive solutions.
I occasionally build some open-source software for myself, stock trader and an avid football player and cricket fan.
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