Use cheap, accessible infrastructure as a laboratory: old e-waste machines, home broadband, open-source software, tiny local LLMs and a low-cost VPS. Rather than beginning with "use a queue" / 'use Re

Use cheap, accessible infrastructure as a laboratory: old e-waste machines, home broadband, open-source software, tiny local LLMs and a low-cost VPS. Rather than beginning with "use a queue" / 'use Redis" or "build microservices," exercises begin with pressures such as lost work, slow consumers, machine failure, sensitive data or sudden load, then let the reader discover why particular architectur