Annotation
Both had to be reasoned out rather than looked up. That is the part worth showing.
Multi-tenant CRM · Solvevare
The first background job system I architected from scratch. Scheduling, custom intervals, per-user SMTP configs, retry logic and failure tracking — with one hard constraint: never send the same person the same campaign twice.
Inventory platform · Solvevare
Allocation rules cascading from category to subcategory to individual product, across user groups and individuals. Deducting one person's limit could not affect anyone else's. No good tutorials exist for this — the logic came from first principles.