Based in Vienna. Working internationally. From our Vienna office, we focus on the Austrian and southern German markets while delivering projects well beyond those borders. International clients with a presence in Vienna also rely on our global experience and technical depth.
Dipl. Arch. ETH ZT | Chartered civil engineer and court-certified expert
Oliver Bertram stands for architecture that works. As a licensed and sworn civil engineer as well as a court-certified expert, he focuses on what makes real estate valuable over time: technically precise revitalisation, sophisticated refurbishment and future-ready workplace concepts.
His background is both international and technical. Trained at ETH Zurich, he combines engineering precision with a broad design perspective. Before his current role, he delivered complex industrial large-scale projects worldwide and, as CEO of Wideshot, led international design assignments. That range of experience, from set design and hotels to industrial buildings, sharpened his focus on what matters most: disciplined processes, dependable timing and functional detail.
Through Bertram ZT GmbH, he now applies this experience to clients across the DACH region. He is the point of contact for clients seeking confidence in technical due diligence, general planning and the strategic repositioning of their work environments.
Professional background and expertise
MA Design | Expert in Project Leadership & User Coordination
Stefanie Mittelbach stands for project leadership that combines structure, foresight and a deep understanding of human and organisational dynamics. As an experienced project leader and certified psychosocial consultant, she has a talent for grasping complex challenges holistically, maintaining structure even in highly dynamic phases and helping decisions happen when they need to.
Her background combines international design management with solid psychological training. This enables her to understand requirements not just as technical data, but as expressions of how organisations actually function, and to translate them into workable planning processes.
Before joining Bertram ZT, she led complex projects as Head of International Projects for major organisations including PwC, Deutsche Bank and the UN. Her experience facilitating decision-making at management level, together with her consensus-oriented approach, makes her a strong partner for clients who want structure and momentum in demanding projects.
Within Bertram ZT GmbH, she is responsible for project leadership and user coordination. With high personal ownership and a strong holistic perspective, she ensures that architectural ambitions and operational requirements are aligned and delivered on time.
Professional background and expertise
