Cloud & AI Engineering

# one app, nine rungs

You build one thing, then you make it survive real traffic

Every project grows the same application — Ask My Docs — a document question-answering API. It starts as one process on one server that a handful of people can use. It finishes as an autoscaled, observed, multi-cloud platform with GPUs that appear only when they are needed. Nothing is thrown away between projects, so you always know why the next piece exists.

1. 01~10 people at once · $5–12 / month
2. 02~50 people at once · $10–20 / month
3. 03~50 people at once · $25–40 / month
4. 04~500 people at once · $0 idle → ~$60 busy
5. 05~5,000 people at once · $70–120 / month
6. 06~50,000 people at once · $150–600 / month
7. 07the same — but now you can see it · +$10 / month
8. 08~50,000 people at once · measured against AWS
9. 09~50,000, on any of three clouds · the full comparison