Sovereignty is not an option. It is a choice.
Anyone who runs software on proprietary platforms relinquishes control - over data, licensing costs, and technical dependencies.
A12 is the alternative: a proven open-source platform for specialized digital processes and complex administrative applications.
Developed in Germany.
In productive use by the tax administration for over a decade.
Open. Modular. Future-proof. No vendor lock-in.
MORE THAN
30
Years of
ExPERIENCE
ExPERIENCE
MORE THAN
1000
Employees
AT mgm
AT mgm
MORE THAN
100
Experts in the
A12 Dev Team
A12 Dev Team
An Average of
10
YEARS of Productive
Software Lifetime
Software Lifetime
One strategic platform. Unlimited possibilities.
A12 provides a proven foundation for digital sovereignty, from simple applications to complex administrative solutions. The platform adapts to your IT landscape, not the other way around.
Development of Custom Software and Procedures
A reliable foundation for mission-critical processes.
Platform for Integrated IT Landscapes
One platform to modernize your entire landscape
Replacement of Small and Fragmented Applications
From 1,000 mini applications to a stable administration landscape
Strong Partner Ecosystem
Proven expertise in consulting, integration, and operations
Five reasons why public administrations choose A12 - and stay for the long run.
Proven Digital
Sovereignty
Sovereignty
Software "Made in Germany" for long-term independence through open standards and European principles
Open Platform Architecture
Modular extensibility for sustainable integration without growing technical debt
Beyond Low-Code
Public Administration requirements built-in: security, compliance, accessibility, and governance are built directly into the platform
AI Readiness
Transparent, traceable AI decisions: governance and control firmly in your teams' hands
Built for the Germany Stack
Integrable, standards-based, and scalable for the federal government, states, and municipalities.
Learn more
Digital sovereignty:
Software "Made in Germany" for long-term independence
For over a decade, the platform has been processing tax returns for an entire country - handling more than 50 million transactions annually and serving over 200,000 users per hour during peak periods. What works for ELSTER works for your specialized systems.
A12 is backed by over 30 years of experience in developing enterprise software that performs reliably in production.
A12 is backed by over 30 years of experience in developing enterprise software that performs reliably in production.
Full control over data, architecture, and operation
No vendor lock-in through open standards and APIs
Investment protection for long application lifecycles
Stable and sustainable systems over decades
Open platform architecture:
Modular, extensible and built for change
The key factor is whether a platform is designed in such a way that government agencies can truly act independently: with technical control in their own hands, clearly separated from the technology, open interfaces, no hidden dependencies, and full access to the code.
A12 delivers exactly that - as a member of the Open Source Business Alliance and with a governance model designed for long-term community development.
Modular and extensible architecture
Open APIs and standards for integration
Business logic stays stable even as technology evolves
Reduced technical debt over time
Beyond low-code:
Public sector requirements built-in
A12 goes beyond low-code by embedding public sector requirements directly into the platform. Security, compliance, quality assurance, accessibility, and deployment governance are part of the foundation.
Administration and IT communicate using a common language, which increases acceptance and speeds up delivery. improves collaboration and results in more robust systems.
Built-in security, compliance, and accessibility
Quality and governance by default
Clear roles for administration and IT teams
Long-term maintainability and reduced dependencies
AI Framework:
Deterministic, controlled, verifiable
A12 combines model-driven engineering with controllable AI and secure agentic coding. The AI operates based on explicit software models rather than as a black box. Decisions remain transparent and traceable, and teams retain control and oversight.
This enables public administrations to deploy AI productively and in compliance with the EU AI Act for long-term, critical systems without losing control or resorting to opaque automation.
This enables public administrations to deploy AI productively and in compliance with the EU AI Act for long-term, critical systems without losing control or resorting to opaque automation.
AI operates based on explicit, traceable models
Transparent and traceable decisions
Governance and control remain within the administration
Secure AI without loss of control
Ready for the Germany Stack:
Open Source from Germany for the public administration
Public administration needs interoperable building blocks that can be combined into a shared digital infrastructure. A12 is designed precisely for this purpose: it is integrable, standards-based, and scalable across federal levels - for the federal government, states, and municipalities.
With its open-source release, A12 is now available as a sovereign platform component for the Germany Stack.
Open source from Germany
Interoperable building blocks
Scalable across federal levels
Strong ecosystem for consulting, integration and operations
Digital sovereignty out of conviction
Germany and Europe must regain digital sovereignty and control over its digital technologies - from development and operation to long-term maintenance. As a strategic platform for managing government services, A12 provides the foundation for this.
Meet us here
Customer Story
Bayerisches Landesamt für Steuern (BLfSt)
A12 – A Key Component of ELSTER for Many Years
Complex tax logic. Modeled, not coded.
50M+
tax returns processed
digitally every year
digitally every year
20M+
identities securely managed
200K+
active users in peak hours
What started in 1996 as the foundation for an electronic tax return is today a standard application used by millions – and still evolving. For many years, mgm technology partners has supported the Bavarian State Office for Taxes in developing and maintaining key ELSTER components, including the "Mein ELSTER" portal. With A12, tax administration experts can model and update validation rules across more than 1,000 tax models themselves – without developer involvement.
The result: faster response to regulatory changes, lower maintenance effort, and a platform that stays reliable at massive scale.
The result: faster response to regulatory changes, lower maintenance effort, and a platform that stays reliable at massive scale.
“In the implementation of ELSTER we opted for a lean project approach with controllable implementation steps. In small teams our experts of fiscal and taxation matters cooperate directly with the technical experts."
Roland Krebs, Division Director at the Bavarian State Tax Office (BayLfSt)
Roland Krebs, Division Director at the Bavarian State Tax Office (BayLfSt)
