Open source from May 2026. Enterprise-proven for 30 years — for digital sovereignty.
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
A12 in 100 Seconds
One Platform. Unlimited Possibilities.
A12 provides a trusted foundation for digital growth, supporting everything from simple applications to complex enterprise solutions. Whatever your starting point, A12 has you covered and is fit for your purpose.
Custom
Enterprise Software
A reliable foundation for mission-critical processes.
Replacing small and fragmented apps
From 1,000 mini applications to a stable enterprise landscape
Integrated IT Landscapes
One platform to modernize your entire landscape
Development of Software Products
Future-Proof Your Product Roadmap from Day One
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.
A12 is going open source in May 2026 – in close coordination with the Bavarian State Tax Office.
Read the full announcement →
The result: faster response to regulatory changes, lower maintenance effort, and a platform that stays reliable at massive scale.
A12 is going open source in May 2026 – in close coordination with the Bavarian State Tax Office.
Read the full announcement →
“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)
What Makes A12 Unique
Open
Source
Source
Built on open standards and freely available – for complete transparency, auditability, and freedom from vendor lock-in
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
Enterprise Features Built-in
More than low code: AI, security, compliance, accessibility, and governance are built directly into the platform
Deterministic AI Framework
Enterprise-safe use of AI: governance and control firmly in the hands of your teams
Full Development Ecosystem
From modeling and implementation to operation and monitoring – all components aligned
Innovation.Implemented.
Where AI meets Model-Driven Low Code
AI is redefining how software is built — but only clear principles turn speed into lasting value. A12 provides the foundation to harness agentic coding in a controlled, secure, and scalable way, transforming PoCs into production software built to endure.