Paraguay e-invoicing pilot tester (SIFEN test environment, own RUC + digital certificate)

We are launching Timbra, a cloud invoicing platform for Paraguay that issues electronic invoices through SIFEN (e-Kuatia). The software is built and tested against a SIFEN simulator. We now need a real Paraguayan taxpayer to run it against SET's official test environment and confirm the end-to-end flow.

WHO WE ARE LOOKING FOR
- Based in Paraguay, with an active RUC (individual or company).
- Has, or is willing to obtain, a digital signature certificate (firma digital, F1) from a MIC-accredited provider such as Documenta or eFirma. We reimburse the certificate cost.
- Comfortable with Marangatu, web apps and basic tax concepts. An accountant or an existing electronic invoicer is ideal.
- Spanish required, English optional.

WHAT YOU WILL DO (about 2 to 3 weeks, a few hours per week)
1. Request enablement as facturador electronico in SIFEN's test environment (Ambiente de Pruebas) via Marangatu and obtain a test timbrado.
2. Create your account in Timbra, upload your certificate and complete the onboarding yourself. You never share your Marangatu password or certificate with us; the certificate stays encrypted inside your account.
3. Run the SIFEN test plan (Guia de Pruebas): sales invoices, credit and debit notes, cancellation and number invalidation, with different customer and tax cases.
4. Report each result with screenshots, the SIFEN response code and short notes. Log any bug or confusing screen.
5. Two short video calls: kickoff and wrap-up.

DELIVERABLES
- Test documents approved by SIFEN in the test environment, with protocol numbers.
- A completed checklist of the test plan.
- A short feedback report on usability and any errors found.

BUDGET: fixed price paid on milestones (enablement done, test plan done), plus reimbursement of the certificate. Bonus if you continue as a paid production pilot after the test.

TO APPLY, ANSWER THESE
1. Do you have an active RUC in Paraguay? Individual or company?
2. Do you already have a firma digital certificate? From which provider?
3. Have you issued electronic invoices before (own business or clients)?
4. Are you available for two 30-minute calls in the next two weeks?

Do NOT send RUC numbers, certificates, passwords or any personal data in your proposal. We only need the answers above.

--- ESPANOL ---
Estamos lanzando Timbra, una plataforma de facturacion electronica en la nube para Paraguay (SIFEN / e-Kuatia). Buscamos un contribuyente real en Paraguay, con RUC activo y firma digital (F1) de un PSC habilitado (Documenta, eFirma u otro; reembolsamos el costo), que solicite la habilitacion en el ambiente de pruebas de SIFEN, cree su cuenta en Timbra, cargue su certificado el mismo (nunca nos comparte claves ni certificado) y ejecute la Guia de Pruebas: facturas, notas de credito y debito, cancelacion e inutilizacion. Entregables: documentos aprobados por SIFEN en pruebas con protocolo, checklist completo e informe breve de errores. 2 a 3 semanas, pocas horas por semana, dos llamadas cortas. Para postular responda: RUC activo (persona o empresa)? Ya tiene firma digital y de que proveedor? Emitio facturas electronicas antes? Disponibilidad para dos llamadas de 30 minutos? No envie RUC, certificados, contrasenas ni datos personales en la propuesta.