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Skontro

Documentation for the Skontro project

Skontro is an open-source German-compliant mini-ERP for the Mittelstand, with first-class EN 16931 e-invoicing.

  • Vision & Scope

    Why Skontro exists, the German e-Rechnung deadlines (1 Jan 2027 / 2028), the gap in open-source German tooling, and the scope of v0.1.0 through v0.4.

    Read the Vision & Scope

  • Requirements

    Software Requirements Specification (PDF) — 62 functional, 45 non-functional, 10 interface requirements. ISO/IEC/IEEE 29148 format.

    Browse requirements

  • Architecture

    arc42-structured architecture document. Sections 1–4 published: introduction & goals, constraints, context & scope, solution strategy. Sections 5–12 expand as the build progresses.

    Read the architecture doc

  • Compliance

    EN 16931 e-invoicing, ZUGFeRD 2.1, GoBD digital bookkeeping (with 2024 and 2025 BMF updates), §14 UStG mandatory fields, German VAT rates. Reference implementation, not certified.

    Read the compliance documents

Documentation map

This site follows the Diátaxis framework, organizing content along two axes — practical vs theoretical, and learning vs working:

Practical Theoretical
Learning Tutorials (coming) Concepts (coming)
Working Operations guides Reference (API, ADRs)

Formal deliverables (SRS, SDD) are produced as PDFs under Requirements and linked from this site.