Encryption 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.

• 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

• Coaching junior developers
• Further development and customer-specific extensions of a standard software product (microservices (DDD) and partly monolith)
• Interface extensions
• Web services
• Test automation
• Design
• Technologies used: Java8, Java17, TypeScript, Python, PostgreSQL, Spring (Integration, Data, Boot), JPA, AWS (Cloud, Lambda, EC2, SQS/SNS), Microservices, Fitnesse/Cucumber, Gitlab

• Continued updates to NavHub GPS server firmware on ARM system
• Developed embedded C/C++ code using Eclipse, embedded Linux, GCC
• Implemented web UI with JavaScript/jQuery, PHP, CSS, HTML
• Configured HTTPS/PKI setup using OpenSSL and Nginx

• Developed a solution for filtering heavily noisy analog sensor data by combining high-speed sampling and digital firmware filtering
• Increased the battery life of a battery-powered medical device from approx. 10 days to approx. 18 months
• Supported the overall project through the first clinical tests and TÜV approval