Stefan Keller

Stefan Keller serves as Chief Product Officer at Open Systems, where he is responsible for the strategic evolution of the company’s SASE portfolio with a clear focus on impact, responsibility, and customer value. He shapes how security, networking, and managed services come together as an integrated platform – designed to operate reliably in complex, real-world environments. 

He supports Open Systems’ ongoing transition toward cloud-delivered SASE models, drawing on long-standing experience across areas such as SD-WAN, Zero Trust, ZTNA, and managed security. His approach is characterized by translating technological developments into practical, scalable solutions that customers can operate with confidence. 

As a product leader, Stefan stands for clarity, accountability, and sustainable product decisions. He emphasizes platform thinking, service-oriented architectures, and close customer proximity to ensure innovation delivers tangible value in daily operations. 

With a strong European foundation and an international perspective, Stefan is focused on further developing Open Systems as a trusted SASE and managed security partner – prioritizing substance, long-term differentiation, and trust.