Multi-Factor Authentication Experts in Hamburg

I implemented a Zero-Trust architecture for robust, military-grade maritime container mini data centers based on VMware & Tanzu to support containerized GIS workloads for ground forces. The main focus was on securing communications, workload protection, and data access in contested electronic battle environments affected by jamming, interception, signal manipulation, and constantly changing operational conditions. I designed and architected use cases so that every element of workload, identity, and system could continue to operate independently and securely even in degraded or disrupted scenarios. In parallel, I defined the enterprise and solution security architecture with LeanIX, Bizzdesign, and HOPEX as enterprise architecture, repository, and governance platforms to maintain architecture inventory, relationships, traceability, target pictures, and security governance in complex environments. For the architectural designs, I used Sparx Enterprise Architect to describe formal architecture views, interfaces, trust boundaries, and system architecture in both IT and OT environments. IriusRisk was used for threat modeling of the solution to identify architecture-driven risks, derive security requirements, and detect countermeasures and design gaps directly from the solution models. Risk and compliance management was supported with Archer. Architecture decisions, control gaps, and operational risks were translated into controlled governance and auditable compliance measures. For documentation, collaboration, and visual design, I used Confluence to maintain Architecture Decision Records, Security Blueprints, and workflows. I used Lucidchart and draw.io to create design artifacts tailored to stakeholders. I also defined OT security concepts with support from electrical and mechanical engineers in the areas of oil, vehicle onboard systems, rail, power plants, pharma, gas turbines, and nuclear technology. I created the end-to-end OT security strategy, starting with global policy, developed into standards and procedures, and finally aligned with Bell-LaPadula, Purdue Model, SABSA, TOGAF ADM, CENELEC 50701, IEC 62443, and NIST standards. In addition, I worked with engineering team leads to identify critical KBP assets and place them under protective measures that segmented SCADA, PLC, and HMI assets. I drove collaboration between Security, IT, and OT teams to create standardized workflows and use cases for the OT security solution catalog, while integrating Defense-in-Depth and Zero-Trust principles into operational environments. A key part of my work was integrating multidisciplinary engineering, security, and operations stakeholders into a unified security blueprinting strategy and ensuring that architecture, threat modeling, governance, and documentation were technically strong and operationally practical.

Enterprise Content Management (ELO ECM) & Process Automation:

• Multi-Tenant System Architecture & Tenants: Designed, deployed, and maintained the ELO infrastructure for over 7080 legal entities (shipping and land-based companies with a total of 150+ active users in onshore/offshore operations).
• User & Group Administration: Full administration of ELO users, creation and maintenance of ELO groups, and implementation of granular, role-based access controls (RBAC).
• Dynamic Workflow Architecture: Designed, programmed, and implemented complex, dynamic approval workflows with hierarchical and cross-departmental approval levels (Multi-Tier Line Approvals, e.g. for invoice approvals and contract management).
• Operational Support & Troubleshooting: Daily troubleshooting of incoming workflow issues, continuous process adjustments, and error resolution during ongoing operations.
• Compliance, Archiving & Optimization: Managed archive structures, replaced paper-based processes with automated ELO pipelines, and ensured compliance with GDPR and audit standards.

Microsoft Dynamics NAV (Navision) – Administration & ERP Support:

• Tenant & User Management: Administration and permission management for complex multi-tenant environments with over 30 tenants (companies and shipping entities) in NAV.
• Master Data & Financial Processes: Created and maintained customers, vendors, posting groups, and supported intercompany transactions.
• Operational Support & Troubleshooting: Daily mid-level error handling for interfaces, document processing, and accounting processes across the various companies.

Hybrid Identity & Modern Workplace Management (M365 / Intune):

• Hybrid Directory Management: Administration of Active Directory (AD) and Entra ID (Azure AD) in a hybrid environment, including identity synchronization, Single Sign-On (SSO), and Multi-Factor Authentication (MFA).
• Endpoint & Security Management: Managed mobile devices and laptops through Microsoft Intune (MDM/MAM), implemented security baselines, compliance rules, and automated software rollouts.
• Security & Network Administration: Administration of Microsoft Defender for Endpoint and management of Sophos VPN authentication profiles to secure remote access.
• Collaboration Infrastructure: Administration of Exchange Online and Microsoft Teams Admin Center, including email hygiene, shared mailboxes, guest access, and SharePoint security policies.

• Developed a greenfield CRM for managing incoming customer requests for a municipal utility provider
• Implemented with PHP/Symfony 5, EasyAdmin, Doctrine ORM and Oracle XE
• Handed over to CiS GmbH after initial groundwork as planned

• Support and maintenance of IT workstations
• Operating, administering, and installing physical and virtual servers
• Administering proxy, firewall, and antivirus solutions
• Administering network and infrastructure including data backup
• Assisting in planning replacements and renewals of IT systems
• Assisting in planning, coordinating, and implementing IT security measures
• Microsoft server operating systems Windows Server 2016/2019
• Central services: AD, GPO, DNS, DHCP, WSUS, SCCM