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Project · case-study

LETOS

An e-commerce operations system centered on inventory, order flow, marketplace integration, and backend reliability.

.NETMySQLEF CoreNginx

Overview

LETOS is a case study in practical e-commerce operations: products, inventory batches, orders, returns, and marketplace synchronization.

Problem

The hard part is not listing products. It is keeping multiple channels aligned while preserving a reliable internal source of truth.

Technical challenges

  • Batch-based inventory changes.
  • Concurrent order and cancellation flows.
  • Integration failures from third-party marketplaces.
  • Clear audit trails for operational debugging.

Lessons learned

The database model and movement log are the backbone. When the audit path is clear, support and debugging become dramatically easier.