Digital Tech MS
Online print shop with artwork approval and production
Context
A print shop sells business cards, banners, stickers and stationery — products where almost nothing has a shelf price and almost everything depends on artwork the customer sends in.
The challenge
Print products have no fixed price: it varies by material, finish, dimensions and quantity, and some combinations only make sense as a custom quote. At the same time, printing is irreversible — wrong artwork approved by mistake becomes material loss, not a bug you patch in production.
The architecture
A pricing engine over configurable options that calculates on the server and recalculates before writing the cart, with an escape hatch into custom quoting when a product has no fixed price. And an artwork flow with explicit approval, which only then releases production.
How the code is organised
The same architectural base as ImpressãoMais3D — a modular monolith by bounded context with the domain layer isolated by an ESLint rule. This codebase was the one that later gave rise to ImpressãoMais3D.
Architecture flow
Configuration
- Material, finish, dimensions and quantity
Server-side price
- Recalculated before the cart is written
- Or a custom quote
Order
- Items and prices frozen
Artwork approval
- Explicit: only then is production released
Production
Delivery
- Shipping or pickup with a code
Engineering decisions
Price calculated on the server
The price never comes from the client. Configurable options feed a calculation engine that runs on the server and is recalculated before the item is written to the cart — the browser cannot negotiate its own discount.
Quoting for what has no price
A product with no fixed price is not left out of the store: it enters through its own quote-request flow that staff answer and the customer accepts, without leaving the same account and order history.
The order as an immutable record
Closing the cart freezes items and prices into an order with its own number and status cycle. What was agreed at purchase time does not change later, even if the catalogue does.
Pickup with a code
Customers choosing in-store pickup get a code that staff redeem at the counter — the order is only marked delivered against that redemption.