Engineering case
Product card data by article number
A service that returns a marketplace product price, stock and attributes from a single article number — with access keys, plans and daily quotas.
The card is split in two by how reachable each source is. The static part comes from an open store whose address is computed from the article number itself; price and stock come from a protected channel that needs a clean address. The response therefore states plainly what it managed to get — fresh data, cache, or a refusal — instead of quietly serving something stale.
Platforms sit behind one interface: a new one is a new class, and the layers above do not change.
Python · FastAPI · SQLite