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Shillinq — Architecture

Complete open-source business administration suite for freelancers, sole proprietors, SMBs, and corporations. Combines bookkeeping, invoicing, procurement, and contract management into one self-hosted solution on Nextcloud.Named after the shilling — one of the oldest and most widely used coins in European history, from the Roman solidus to the British shilling to the East African shilling still in use today.Shillinq covers:- Bookkeeping & general ledger (double-entry accounting)- Accounts payable & receivable- Sales invoicing & e-invoicing (UBL/Peppol)- Purchase orders & procurement workflows- Supplier management & approval chains- Contract lifecycle management (creation, renewal, obligations)- Bank reconciliation & payment matching- VAT/tax reporting & compliance- Financial statements (P&L, balance sheet, cash flow)- Budget planning & forecasting- Multi-currency support- Dutch government compliance (BBV, IV3, SiSa, DigiInkoop)

Standards​

  • Aanbestedingswet: Aanbestedingswet 2012 (aanbestedingsrecht)
  • BBV: Besluit Begroting en Verantwoording provincies en gemeenten (government-accounting)
  • BW Boek 2 Titel 9: Burgerlijk Wetboek Boek 2 Titel 9 - Jaarrekening (handelsrecht)
  • DCAT: Data Catalog Vocabulary (Openbaar en toegankelijk)
  • DCAT-AP-NL: Het Nederlandse applicatieprofiel op DCAT-AP ()
  • DigiInkoop: DigiInkoop e-Procurement (e-procurement)
  • Fiscale bewaarplicht: Fiscale bewaarplicht (AWR art. 52) (belastingrecht)
  • Handelsregisterwet: Handelsregisterwet 2007 (handelsrecht)
  • ISO 20022: ISO 20022 Financial Messaging (payments)
  • IV3: Informatie voor Derden (government-accounting)
  • NLCIUS: Semantisch Model e-Factuur (e-invoicing)
  • Peppol BIS: Pan-European Public Procurement Online Business Interoperability Specifications (e-invoicing)
  • RGS: Referentie Grootboekschema (accounting)
  • SBR: Standard Business Reporting (financial-reporting)
  • SEPA: Single Euro Payments Area (payments)
  • SiSa: Single Information Single Audit (government-accounting)
  • TOOI: Thesauri en Ontologieën voor Overheidsinformatie (Uitwisselingsfundament)
  • UBL: Universal Business Language (e-invoicing)
  • Wet OB: Wet op de Omzetbelasting 1968 (belastingrecht)
  • Wet VPB: Wet op de Vennootschapsbelasting 1969 (belastingrecht)
  • Wwft: Wet ter voorkoming van witwassen en financieren van terrorisme (financieel-toezicht)
  • XBRL: eXtensible Business Reporting Language Dimensions (financial-reporting)

Feature Domains​

  • Ai
  • Analytics
  • Collaboration
  • Core
  • Document Management
  • Governance
  • Integration
  • Media
  • Participation
  • Scheduling
  • Security

Architectural Decision Records​

  • Architecture — Shillinq — see openspec/architecture/
  • Data Storage — Shillinq — see openspec/architecture/
  • Deployment — Shillinq — see openspec/architecture/
  • Integration — Shillinq — see openspec/architecture/
  • Security — Shillinq — see openspec/architecture/

Data Layer​

All data stored via OpenRegister (JSON schema validated objects). No custom database tables.