I have designed and operated cloud environments for federal agencies, healthcare systems, and mid-market businesses. Those are very different environments with very different requirements, but the underlying discipline is the same: understand what the system needs to do, design it so it performs and survives, document it so it can be maintained.
At Avaya Professional Services I architected cloud environments for Impact Level 5 federal compliance. That means designing for security, availability, and auditability at a level most businesses will never need -- but the habits it builds carry into every engagement I take on. I know what rigorous infrastructure design looks like because I have done it in environments where there was no tolerance for anything less.
I approach every infrastructure engagement the same way: start with the business requirements, identify what availability and recovery actually need to look like for this operation, then design the architecture that achieves that without over-engineering or unnecessary cost.