Enterprise Architecture Expertise with Academic Rigour and Real-World Experience
Portamus GmbH was founded as a spin-off of the University of St. Gallen (HSG) — one of Europe's leading business schools. We bring academic best practices and certified expertise to enterprise architecture, business process management, and digital transformation for organisations across Germany and Europe.
From HSG to the Heart of German Enterprise
Portamus was born at the University of St. Gallen (HSG), Switzerland's premier business and technology institution. Our founding team brought together academic researchers and enterprise practitioners with a shared conviction: that the gap between business strategy and IT execution is the single biggest drag on organisational performance.
"Today, Portamus operates at the intersection of Enterprise Architecture Management, Business Process Management, and IT Service Management, deploying certified architects and experienced professionals who work directly with your senior teams."
Dr. Marcel Rosenberger, Managing Director, Portamus GmbH
Architects and Consultants Network
Every client engagement is led by a credentialed senior professional — not delegated to junior staff. Here are the people you can trust.
Dr. Marcel Rosenberger
Managing Director
Marcel founded Portamus as an HSG spin‑off and has since led enterprise architecture and process‑management engagements for large enterprises and public administrations across Germany and Europe. As interim Chief Architect, he oversaw the consolidation of Singapore’s government data centres, which host critical health‑sector infrastructure. He holds a doctorate in information systems and has published extensively on software migration, enterprise modelling, and social‑CRM architecture.
Sarah Rosenberger
Senior Financial Advisory
Sarah has extensive experience in financial consulting and the banking sector. At Portamus, she leads the demanding international client relationship management function. Her combination of financial expertise and many years of consulting experience ensures strong governance across all client projects. In addition, she runs her own financial services agency.
Dr. Olaf-Rüdiger Hasse
Senior Advisory Network
Olaf brings over decades of IT leadership and has held Senior Vice President and board-level executive roles at major consulting and software organisations, leading operations, growth strategy, and CxO-level client engagements across Europe. He contributes deep expertise in technology consulting, product strategy, and high-stakes programme delivery, with a particular focus on enterprise architecture and transition & change management.
Dr. Gerd Kopetsch
Senior Advisory Network
Gerd holds a degree in economics and has deep expertise in process design and organisational development. He channels this knowledge into coaching engagements and structured qualification programmes, helping organisations build internal capability alongside structural change. As Senior Advisor, he contributes expertise in change facilitation and process-driven organisational transformation in challenging business environments.
What Sets Our Approach Apart
Our clients return engagement after engagement because of the rigour, independence, and seniority we bring to every project.
HSG Academic Foundation
Founded as a university spin-off, we bring structured, evidence-based methodologies — not ad-hoc consulting.
Certified Senior Expertise
TOGAF®, ITIL®, SAP, and PRINCE2 certified. Every engagement is delivered by credentialed senior professionals.
Vendor-Neutral
We advise independently of any technology vendor. Our recommendations are driven by your business needs alone.
Senior-Only Delivery
No junior consultants, no subcontracting. Every client works directly with our senior architects and analysts.
International Expertise
Deep knowledge of German and European regulatory requirements, public sector processes, and enterprise IT environments.
Measurable Outcomes
We define success metrics at the start and track them throughout — cost savings, process efficiency, delivery timelines.
Certifications & Credentials
Our consultants hold the leading enterprise architecture and IT management certifications, ensuring rigour and quality on every engagement.
TOGAF®
Certified
ITIL®
Foundation
SAP ERP
Certified
ArchiMate®
Foundation
ArchiMate®
Practitioner
ERP
TERP10
ADOIT
Trained
Solutions Business Manager (SBM)
Certified
Universität St.Gallen (HSG)
Spin-Off
Consulting Club
Premium Member
The Portamus Approach
Every engagement follows our structured methodology, adapted to your organisation's context and pace.
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.
Ready to Discuss Your Enterprise Architecture Challenge?
Get in touch with our senior architects and consultants. We offer an initial discovery session to understand your situation before recommending a path forward.
Office hours Mon–Fri 9am–6pm CET. Reach us at contact@portamus.com or +49 (0)208-30980891.