Transform Your Enterprise Architecture. Align Business with IT. Enterprise Architecture
Portamus GmbH helps large enterprises, public administrations, and mid-market companies achieve real IT-business alignment through TOGAF-certified consulting, business process management, and hands-on digital transformation programmes.
Trusted by Leading Organisations
Serving Complex Organisations Across Germany and Europe
We work with large enterprises, public administrations, and mid-market companies that need senior architecture expertise to navigate transformation with confidence.
The IT-Business Gaps We Help You Close
Enterprise IT complexity rarely solves itself. These are the situations we're called in to address.
Not sure where to begin? Our initial architecture assessment gives you a clear baseline in 2–4 weeks.
End-to-End EA & Transformation Services
From architecture assessment to programme delivery, Portamus provides the full spectrum of enterprise architecture and digital transformation services.
Application Portfolio Management
Architecture Consulting
Rationalise your application portfolio — identify redundancies, end-of-life systems, and consolidation opportunities to reduce total cost of ownership.
Architecture Maturity Assessment
Architecture Consulting
Evaluation of your enterprise architecture function's maturity against industry benchmarks — identifying capability gaps, governance weaknesses, and a structured path to a higher-performing EA practice.
Business-IT Risk Analysis
Architecture Consulting
Structured analysis of your IT risk landscape — identifying architecture risks, business-IT misalignment, and technology dependencies that represent material risk to your strategic objectives.
Business Process Management
Process Management
End-to-end BPM consulting covering process modelling in BPMN 2.0, process optimisation, and full BPM implementation — from discovery through deployed, measurable processes.
Change & Problem Management
Service Management
Structured change management and problem management process design — reducing the risk of IT changes and eliminating recurring incidents through root-cause driven problem resolution.
Cloud Architecture & Migration
Transformation
Cloud architecture design and migration planning covering target architecture, workload assessment, hybrid cloud governance, and a phased migration roadmap aligned to your business objectives.
Why Leading Organisations Choose Portamus
We are a specialist enterprise architecture consultancy — not a generalist IT firm. Every engagement is led by a certified senior architect with real-world delivery experience.
Senior Architects Only
Every engagement is led by a certified senior architect or consultant. No junior-led work, no subcontracting.
TOGAF® & ITIL® Certified
Our team holds TOGAF®, ITIL® Foundation, and SAP ERP certifications — which means we know when to apply a framework and when to adapt it to your reality.
Vendor-Neutral Advice
We are not affiliated with any technology vendor. Our recommendations are driven solely by your business needs.
HSG Academic Foundation
Founded as a spin-off of the University of St. Gallen, we bring structured thinking to messy real-world problems — without the ivory tower.
European Market Expertise
Deep knowledge of German and European regulatory contexts, business culture, and enterprise IT landscapes.
Long-Term Partnerships
We build lasting relationships. Most clients retain us across multiple programmes and years of transformation.
Our Certifications & Methodological Standards
TOGAF®
The Open Group Architecture Framework
ITIL
IT Infrastructure Library Service Management
SAP ERP
SAP Enterprise Resource Planning
ArchiMate
ArchiMate Modeling Language Foundation
ArchiMate
ArchiMate Modeling Language Practitioner
SAP ERP
TERP10 Certified
ADOIT
Enterprise Architecture
Solutions Business Manager (SBM)
Certified
University of St.Gallen (HSG)
Spin-Off
Consulting Club
Premium Member
Our Methodologies & Frameworks
We apply internationally recognised frameworks — TOGAF, ITIL, BPMN, ArchiMate and more — to deliver structured, repeatable transformation results.
ArchiMate® 4 — Enterprise Architecture Modelling Language
ArchiMate® 4
The international standard for enterprise architecture modelling — the visual language of TOGAF.
BPMN 2.0 — Business Process Model and Notation
BPMN 2.0
The OMG standard for business process modelling — used by Portamus for all BPM engagements.
COBIT 2019 — Governance of Enterprise IT
COBIT 2019
Comprehensive IT governance and management framework covering 40 governance and management objectives.
Design Thinking for Digital Transformation
Design Thinking
Human-centred innovation approach for designing digital services, products, and transformation programmes.
GDPR Data Architecture & Governance
GDPR Data Architecture
Architecture patterns and governance frameworks to embed GDPR compliance into your enterprise data architecture.
ISO/IEC 20000 — IT Service Management Standard
ISO/IEC 20000
The international standard for IT Service Management — the formal certification counterpart to ITIL® best practices.
The Portamus Approach
Every engagement starts with understanding your specific situation — your culture, your people, your constraints. The methodology follows, not the other way around.
Understand
We begin by comprehensively grasping your current state: business goals, IT landscape, stakeholder expectations, and pain points.
Analyse
We examine your architecture and processes in depth — assessing initiatives, tracking objectives, and identifying gaps.
Design
We develop architecture blueprints, process models, and transformation roadmaps aligned with your strategic direction.
Realise
We translate designs into implementation, working alongside your teams to ensure tangible, measurable outcomes.
Govern
We establish governance frameworks to sustain the architecture and ensure continuous alignment as your organisation evolves.
Real Outcomes. Documented Results.
Enterprise architecture consulting is measured by business outcomes, not deliverables. Here is how we have created measurable impact for our clients.
European Aviation Authority Designs ECCAIRS-Integrated Occurrence Reporting System
Optimisable digital system for managing internal aviation occurrences, required integration with European ECCAIRS standard
Process design for IORS, ECCAIRS integration architecture, SAP integration evaluation, staff training
IORS live (easa.europa.eu/iors), ECCAIRS integrated, EU-wide incident data exchange enabled
Fashion Retailer Builds ITIL-Compliant ITSM with Automated CMDB
No unified ITSM, missing CMDB, manual release processes without unified automation for host and Java workloads
ITIL CMDB with automated asset discovery, Nagios monitoring, ChangeMan z/OS release management, Serena PPM
Automated CMDB live, release management brought into production, SLAs and OLAs defined
National Healthcare System Consolidates ITSM Architecture Across 22 Hospitals
Fragmented ITSM across 6 hospital clusters, no unified monitoring for health-critical SLAs
End-to-end ITSM architecture across 8 process areas, SLA monitoring design, 4-system integration blueprint
Unified ITSM blueprint for $54M programme, SLA-capable monitoring, integration architecture delivered
Trusted by Enterprise Leaders
Mr. Rosenberger with his team from Portamus possesses excellent professional and technical expertise and impressed with his quick comprehension, determination, and flexibility.
Questions We Hear Sometimes
Don't see your question here? Our team is happy to talk through your specific situation — no sales pressure, no obligation.
Ask Your QuestionReady to Align Your Business with IT?
Whether you're starting an architecture programme from scratch or rescuing a stalled transformation, Portamus brings the senior expertise and proven methodology to deliver results.
Initial calls are free and obligation-free · Responses within 1 business day