VPN Experts in Hamburg

Rollout of printers and PCs

• Effective management of external service providers to ensure smooth operations.
• Planning and implementation of a global rollout for 150,000 clients.
• Carrying out a comprehensive risk analysis, including overall risk, site-specific risks, and security risks.
• Successful consolidation of two existing ServiceNow systems to optimize service management.
• Close coordination with program management to achieve the project goals.

• Environment: AWS, Ruby on Rails, GraphQL, React Native
• Penetration test for Backend, Android-App and iOS-App

• Data-analysis, Preparation, gathering and coordination of business requirements for retrieval of monthly- and long term (CLV – relevant) cost- and revenue-components per contract for a customer–base–grouping project (HUB–Project) for B2C-Postpaid-Controlling
• Concept and Implementation of cost- and revenue-KPIs calculation and corresponding CLV–reports (Oracle, Perl, SVN, MS SQL Server, MS Power BI, Serviceware Performance Analytics)
• Operational support of the HUB-Project – various ad-hoc reports, deployments, job-scheduling etc. (Oracle, SVN, BICSuite–Scheduler, DWSODA etc.)
• Analysis, implementation, retrieval and reporting of various physical and financial KPIs for B2P-Prepaid Business on an existing data-mart (Oracle, Perl)

• Responsible for the configuration, maintenance, monitoring, troubleshooting, and optimization of the IT infrastructure, including Extreme Networks, SD-WAN, and Fortinet security solutions, at all international company locations in Europe and North America
• Development of a comprehensive strategic roadmap to optimize the network architecture, including VLANS, NAC, QoS, firewall configurations, VPNs, DPI, NGFW, threat intelligence, and SSL/TLS inspection
• Implementation of the OneIT strategy through the introduction of new technologies such as Cisco DNA Center, ExtremeCloud IQ, FortiOS, FortiManager, and FortiAnalyzer, which increased employee skills and the efficiency of the IT systems
• Integration of IT and OT systems to optimize the network and security architecture and improve operational efficiency

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.

• Designed and implemented a Python-based ETL pipeline with the Dagster framework to transform raw energy data from heterogeneous sources using InfluxDB and visualizations in Grafana
• Defined time-based and dependency-based jobs
• Deployed to managed Kubernetes clusters using Helm
• Integrated InfluxDB Cloud
• Prepared data for use in Grafana, including cleaning, normalization, and time-based resampling in Python
• Developed dashboards and visualizations in Grafana
• Developed unit tests with mocking using pytest
• Set up a CI/CD pipeline in GitLab

Technologies: Python, Dagster, InfluxDB, Grafana, pandas, pytest, REST, CI/CD, GitLab, Container, Kubernetes, Helm, Docker, Cloud

• Poliks – State Police System for information, communication, and case management and other state variants (ViVa, Bravo, customs)
• Developed a test framework for test automation to replace an existing proprietary test client for new developments, focusing on easy maintenance and simple extensibility for new technologies
• Designed the architecture
• Implemented the architecture
• Created a proof of concept by migrating existing test cases into the new test framework
• Platform: C#, .NET, Jira, XRay, Confluence, Playwright, Selenium, UI Automation, Appium, HTML, Git, VMWare, Windows 11, Linux

• Configuration of Dell switches, routers, and access points.
• Troubleshooting and issue resolution.
• Extreme, Cisco and Dell switches and routers environment, Extreme A3 NAC, Extreme CloudIQ.

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.

• Monitoring the health and performance of internal IT systems (servers, networks, endpoints)
• Performing routine checks on Active Directory, SCCM, antivirus, and MDM platforms
• Diagnosing and resolving hardware/software issues on Windows, macOS, and mobile platforms
• Conducting quality checks when implementing new technologies
• Creating accurate documentation of incidents, changes, and service requests
• Tracking and managing IT equipment inventory

• Disciplinary and professional leadership of the IT and service team
• Definition and documentation of the Current Mode of Operation (CMO) in Confluence: application landscape, infrastructure, networks, backup & storage
• Development of the Future Mode of Operation (FMO) including process analysis & stakeholder interviews with all departments using BPMN and flowcharts
• Optimization of license management: reduction of ongoing software costs by approx. 17% p.a.
• Introduction and establishment of Jira as the central tool for project and service management
• Introduction and rollout of the HR software MindKey to digitize HR processes
• Introduction of a VoIP solution with Microsoft Teams incl. PSTN connection to replace classic telephony
• Introduction of the production and planning software OptiControl to digitize operational processes
• Rollout of Intune as a Mobile Device Management solution for Windows, iOS and Android
• Build-up of Power BI dashboards for machine park monitoring and financial reporting
• Planning and execution of the IT consolidation of two locations for 170 users
• Introduction of automated penetration testing with Pentera
• Coaching and mentoring the team in agile methods & project management
• Operational support in day-to-day business: administration, incident & change management
• Management of external service providers and assurance of the quality of outsourced IT services
• Responsibility for the IT budget incl. planning and controlling
• Direct reporting line to management with regular management reports on IT KPIs, budget and project status

• Developed a complete solution for ethics committees and medical associations, from application submission to approval
• Integrated a DICOM viewer to display medical images (CT, MRI)
• Implemented a file system with folder and subfolder structures
• Identified and fixed security vulnerabilities
• Improved code quality and application performance
• Maintained customer servers

• Embraced full-time caregiving while achieving B2 German fluency
• Advanced cybersecurity skills through hands-on training at Masterschool
• Worked with AI & LLM tools: ChatGPT, Claude, Gemini, prompt engineering basics, LLMs, AI-assisted writing tools

• Collaborated closely with key users, business analysts and product owners to understand requirements, define priorities and derive solutions
• Managed external service providers
• Oversaw and executed updates, patches and release management
• Handled incident, problem and change management according to ITIL
• Analyzed and evaluated incidents and changes for operational impact and business processes
• Monitored systems and interfaces, ensuring IT security and compliance requirements
• Supported IT planning, cost monitoring and contract management
• Created and executed tests for maintenance and projects
• Assisted in designing technical solutions and contributed to projects such as IT landscape harmonization and modernization
• Independently led operations-related projects and continuously optimized processes
• Achieved significant cost savings through supplier negotiations, rightsizing and decommissioning of legacy systems
• Technologies: Azure DevOps, ServiceNow, icinga, metalogic mPE/mPX, FIS, inubit, Oracle, LeanIX, One Identity, Confluence, Copilot, XML, JSON, SQL, RabbitMQ, Python, BPMN, OKR, ITIL, Kanban