Context

mydoc-loyalty is a service built around a loyalty program. Here, you can’t “just write code” — mistakes directly affect business processes.

The challenge

Create a predictable backend that:

• handles rules correctly
• scales logically
• integrates easily via API

Implementation

The focus was on:

• clear business logic
• explicit API contracts
• well-structured data models

I intentionally avoided hidden magic and implicit behavior.

Result

The service turned out to be:

• transparent
• maintainable
• easy to evolve

Takeaway

Backend code is always a conversation with future developers. The clearer you speak now, the less pain there will be later.