SregERP: Light-Steel DDD Modular Monolith
A 9-crate Rust + Svelte 5 ERP for light-steel manufacturing with meter-level stock segment lineage, cut optimization, and realized-waste accounting.
Generic inventory systems count discrete SKUs, which fails completely in light-steel (baja ringan) manufacturing and distribution where every cut of a spandek roofing sheet or 50m coil creates child segments, offcut remainders, and potential margin leakage.
We engineered SregERP as a 9-crate Rust DDD modular monolith (kernel, inventory, sales, procurement, fulfillment, hr, organization, expenses, web_api) on Axum 0.8, SQLx 0.9, and PostgreSQL 16, paired with a SvelteKit 5 runes interface. Every physical sheet is tracked as a StockSegment aggregate in meters with parent-child cut lineage, stock-form cut policies (largest-remainder for spandek sheets, best-fit for rolls), multi-branch holding scopes, and Monday-Saturday Gaji Harian payroll.
Eliminated unrecorded offcut waste by tying physical cut execution, Lapor Rusak damage grading, Prime/Clearance/Dead stock valuation, and weekly payroll directly into live P&L, Balance Sheet, and Cash Flow statements.