Work
WorkOptimuz in production
Electronic invoicing for Ecuador
Every sale at the register becomes an invoice authorized by the SRI, Ecuador’s tax authority. If the SRI goes down, the system recovers without issuing a duplicate.
0 duplicate invoices
- Role
- Software developer at Optimuz
- Status
- in production since October 2026
- Stack
- Laravel 13, PHP 8.3, PostgreSQL 16, React 19, TypeScript, MUI, TanStack Query, NestJS, Docker, nginx, Linux
- Links
- optimuz.dev private repositories
The problem
Small businesses in Ecuador must issue an electronic invoice, authorized by the tax authority (SRI), for every sale. Doing it by hand is slow and error-prone.
What I did
I develop and modernize Optimuz’s invoicing product without interrupting invoicing.
- From the register to the SRI. I integrated Loyverse POS: every sale becomes an authorized invoice on its own, and the customer gets the PDF and the XML by email.
- Guaranteed issuing. If the SRI goes down, the system resends the same signed XML. Neither the invoice number nor the sale is duplicated.
- Lumen 8 to Laravel 13, with no downtime. I validated the migration by comparing hundreds of responses against the old version, with automatic rollback.
- A new dashboard in React 19. I migrated it from Angular 13 screen by screen, sharing the session.
- The new POS. I designed a Flutter app that takes payments offline, with identical tax math in Dart and PHP. Management approved the design and it is in development.
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Home
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Invoices
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Menu
Outcome
In production since October 2026, with hundreds of authorized invoices and zero duplicates.
- 0 duplicate invoices across hundreds issued
- −61% download size React dashboard vs. Angular
- −72% code in the new dashboard