Java Experts in Dusseldorf

• Operation and further development of the network and security infrastructure.

• Monitoring, analysis and resolution of network and security incidents.

• Cross-department collaboration with other specialist teams for operations, further development and reporting.

• Firewall vulnerability analysis.

• Firewall rule approvals.

• Troubleshooting IP communication issues in the network and firewall infrastructure.

• Security-critical IT infrastructure, processing of personal data, compliance with legal regulations.

• Products: Palo Alto Networks Firewalls, Cisco ACI, Checkpoint Firewalls, F5

• Technologies: SDN, SDWAN, Cisco EPIC, Cisco ACI

• Optimizing and accelera­tion of our Gitlab CI pipeline

• Conceptual work for the PoC of the Zero Trust system

• Extension of the policy-engine backend in Go

• Extension of the policy-testing mechanism in Python

• Architectural design of the PEP component of Zero Trust

• Documentation of the product

• Technologies: Zero Trust, Go, Python, Gitlab CI, Docker, JWT, Domain-Driven Design

• Training the AI models, evaluating images and texts for UI/UX, turning the provided data into insights via OpenAI Feather as part of the machine learning workflow

Technologies: OpenAI Feather

• Overall project planning for resources, budget, costs, license and service contracts, cost optimization and negotiations
• Leading and managing the project team and achieving the project goals
• Leading digitalization projects and their phases such as concept, planning, change and requirements management, configuration, implementation, testing, interfaces, communication and approval
• Conducting planning meetings
• Organizing, planning and conducting team, customer and requirements workshops with up to 50 participants at operational and management level
• Main contact for technical and functional topics as well as project coordination
• Recording and maintaining backlogs (user stories and EPICs) in Jira and turning requirements into user stories and prioritizing them
• Approval and publication of online services in the Wirtschafts-Service-Portal.NRW (WSP.NRW)
• Creating and maintaining project documentation
• Planning and designing the nationwide rollout/reuse as part of the once-for-all principle via WSP/FIT-Connect
• Communication between stakeholders, customers, authorities and the Ministry of Economic Affairs, Industry, Climate Protection and Energy (MWIKE)
• Work according to the SCRUM method

PLANT-MY-TREE®-per-order

The application enables Shopify merchants to automatically place tree-planting orders for every incoming order. By integrating ecological contributions directly into the purchase process, the manual effort for tracking and billing reforestation initiatives is eliminated. The system increases transparency for end customers through real-time visualizations of the ecological impact directly in the storefront. The architecture is based on a modular monolith with Spring Boot in the backend and an integrated React app inside the Shopify admin area. The solution uses webhooks to capture order data in an event-driven way and integrates the weclapp ERP system for automated monthly invoicing. An app proxy mechanism provides dynamic statistics such as CO2 compensation and planted trees without any performance loss for the merchant shop.

Tasks:

• Design of the modular software architecture based on Spring Modulith to ensure high maintainability
• Development of the event-driven business logic for evaluating Shopify orders via webhooks
• Implementation of automated invoicing by connecting the weclapp REST API
• Building the frontend using React Router and Shopify App Bridge for native integration
• Design of the database model and implementation of the persistence layer with JPA/Hibernate and Prisma
• Integration of internationalization processes for global use in the frontend and email communication
• Automation of deployment processes using Docker and GitLab CI/CD

Project skills: Java 25, Spring Boot, Spring Security, Spring Modulith, Hibernate, JPA, REST API, PostgreSQL, Maven, Liquibase, React, TypeScript, React Router, Vite, Node.js, Prisma, Zod, Docker, Docker Compose, GitLab CI/CD, Shopify CLI, Shopify App Bridge, Polaris, weclapp, i18next, Lombok, Vitest

Program Manager for a radical architecture and IT transformation program (RAITT) reshaping the applications landscape (i.e. cloud transformation) and operating model into agile organisation.

• E2E readiness towards mass-market business division covering demand, delivery, test and roll-out phases
• Driving Telefonica internal teams and external system integrators to ensure delivery on time and in quality in adherence to defined processes
• Management of risks, issues and dependencies on program level

• Ensured 99%+ platform availability across Android, iOS, and web, maintaining zero customer-impact and zero P1 incidents through proactive monitoring and risk mitigation.

• Led Incident, Problem, and Change Management with offshore operations and vendors, driving rapid issue resolution and improving product stability.

• Partnered with QA teams and international OpCos to validate defects, reproduce issues, and enhance product quality using real-time customer insights.

• Managed end-to-end lifecycle activities including platform migrations, infrastructure upgrades, certificate renewals, and integrations (Identity, API, Messaging).

• Established operational excellence and governance by designing service support models, leading Early Life Support (ELS) and post-launch stabilization, delivering KPI reporting, and ensuring seamless transition from project to service management.

• Product: Secure Net - Classic, Converged & Home Wifi Protect

• Product Description: The all-in-one digital security service that helps keep you and your family safe online when using the Vodafone (Mobile and Broadband) network. Get alerts if your personal information shows up anywhere it shouldn't, whilst we find and block malicious content across all your devices using.

• Clients: Vodafone OpCos - Spain, Italy, UK, Ireland, Greece, Turkey, Germany, Portugal, Romania

• Role & Location: Service Manager for Lifecycle and Operations at Düsseldorf, Germany

Worked with/on: ITSM Remedy, Jira, Confluence, Splunk, Dynatrace, Tableau, Mongo DB, Google Analytics, App Follow

• Architected and deployed a live B2B geocoding and demographic-data platform for Germany, combining address lookup with census-based population statistics through a web application and REST API.

• Evaluate, design, and implement Power BI solutions for Cat4 reporting, significantly improving reporting efficiency, accuracy, and stakeholder visibility.
• Develop and maintain robust data integration interfaces between Cat4 and Power BI, eliminating manual processing bottlenecks.
• Configure and continuously optimise Power BI reports to deliver sharper management insights and support data-driven decision-making.
• Ensure full GDPR data protection compliance across Power BI reports, proactively identifying and mitigating risks.
• Acquired in-depth product knowledge of CAT4, a globally deployed enterprise platform, enabling effective requirements analysis, solution design, and seamless Power BI integration across client environments.
• Developed and integrated scalable reporting templates within the CAT4 product interface, delivering new product features and enhancing data visualisation, reporting efficiency, and stakeholder visibility across global users.
• Trained and mentored staff on Power BI configuration and best practices, accelerating adoption and embedding a data-driven culture.
• Prepared clear technical documentation and delivered hands-on demonstrations to end users and clients, ensuring smooth adoption and confident use of Power BI solutions integrated with CAT4.
• Researched and recommended licensing strategies for cost-effective and scalable Power BI deployment.

SKILLS - BI & Visualisation: Power BI (Desktop, Service, Report Builder), DAX, Power Query

Project and Product Management Tool: CAT4

• Analysis and remediation of security vulnerabilities in a risk assessment system for energy trading
• System analysis
• Threat modeling
• Decision-making on vulnerability mitigation strategies
• Implementation of vulnerability detection mechanisms
• Security scans
• DevSecOps practices
• Technical environment: Visual Studio Code, JetBrains Suite, MS Threat Modeling Tool, DevSecOps, Git, AWS, DynamoDB, SQL Server, Endur, Snowflake, Orca
• Languages: C#, JavaScript, TypeScript, Python, PowerShell, Bash, Terraform, SQL

• Worked on FPGA enhanced network encryption device with secure boot, TPM2.0 and smart card integration for BSI approved usage with Post Quantum Cryptography
• Developed and audited Linux drivers
• Collaborated using GitLab, Gerrit, Confluence and Jira
• Technologies: C, C++, Secure Boot

• Project management for the location consolidation of a major telecom provider (client: Telefonica) since 2023
• IT multi-project management for a large leasing company (client: Athlon) from 2021 to 2022
• Migration of applications to the cloud and to another data center
• Extension and optimization of the application landscape through additional projects
• Project management for developing a platform for internet access on airplanes of various airlines (client: m3Connect/Deutsche Telekom) 2021
• Responsible leadership of an IP network consolidation (infrastructure project) at a major telecom provider (client: Cisco/Vodafone) from 2017 to 2020
• Planning and coordination of migrations and rollouts
• Team leadership integrating different teams (network operators, hardware and service suppliers)

The Helaba ATLAS project aims to modernize core systems and make them future-proof. As part of the subproject, the existing legacy system for international payments is being replaced by a modern web-based application.

• Analysis of functional and technical requirements
• Analysis and optimization of business processes
• Process modeling
• Preparation and facilitation of workshops
• Defining project scope and prioritizing requirements
• Business process management (analysis, modeling, and optimization)
• Specification of user stories
• Designing business and authorization concepts
• Testing and acceptance
• Designing mockups in Figma
• Creating the UI/UX style guide for web applications Approach: Scrum (agile) Technologies: Jira, Confluence, MS Teams, Conceptboard, Java, Vaadin, Figma

I continuously expand my expertise in AI and automation, working with ChatGPT, OpenAI, Manus, Gemini, MS CoPilot, API, LangChain, Hugging Face, Manus, TensorFlow and Auto-GPT as well as Python-based ML frameworks and MLOps tools to intelligently transform classic software development, analysis, and testing processes.