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• Mendix low-code development / project management
• Managing external resources
• Customer and user management, roles
• Master data entry
• Quote preparation
• Material costing
• Workflows
• Basic CRM functions
• API interfaces (email, SMS, AI chatbot)
• PDF API (.NET development using Aspose.PDF)
• Stakeholder management (dev teams, enorin team, test client)
• Risk management (backend access & sizing, role concepts)
• Testing and staff training
• Creating epics and stories in Confluence
• Jira Scrum planning and management

Product:

• Built a production-ready AI platform for generating brand-aware marketing images and videos from product data, user requirements, and uploaded media.
• Own the platform architecture, technical roadmap, API design, security, deployment workflow, operational reliability, and model-provider strategy.
• Developed the core platform in .NET and built supporting AI and workflow prototypes in Python, applying language-independent API contracts and structured interfaces between services and model providers.
• Implemented reliable background processing with RabbitMQ, persisted workflow state, idempotent handling, retries, failure recovery, logging, secure storage, authorization, and credit accounting.
• Made pragmatic build-versus-buy and model-routing decisions based on reliability, latency, cost, and maintainability rather than novelty.

Agent Orchestration & RAG Systems

• Built and compared agent workflows using Microsoft Agent Framework, LangGraph, and LangChain, including tool use, conditional routing, clarification steps, state management, and hand-offs between agents.
• Implemented reusable .NET components for agents, prompts, tools, model providers, structured responses, and retrieval with pyvector, making it easier to change AI providers without rewriting the core workflow.

• Expert for the agency's architecture management area

• Support for standardizing the agency's IT landscape

• Further development of architecture management

• Shaping the agency's business architecture

• Restructuring, managing and maintaining all IT assets

• Support for creating a unified software asset management and CMDB

• Creation of a unified document management (e-file)

• Transition of documents into a central DMS structure

• Link between architecture management and the internal department's business process management

• Support in drafting strategic and tactical development plans

• Organizing communication with key stakeholders

• Support in conception, organization and coordination of the architecture office to be built

• Guidance and consulting throughout the entire architecture management process

• Consulting the agency's divisions on architectural topics and their framework conditions

• MS Office, Windows 10, VBA

• ITIL, TOGAF, PowerBI, Kanban, Scrum

• In-house government tools

• Open Touch Conversation, Webex, Wire, BDBOS

• MS SharePoint, JIRA, Confluence

• ARIS, ArchiMate, BPMN

• Regulated environment within a German banking group (approx. 8,500 employees, hybrid cloud strategy).

• Responsible for operating, provisioning, and continuously securing business-critical platforms – including a GenAI chat application, a big data/AI platform, and data science workspaces based on Azure Virtual Desktops and VMs. Ownership of Azure DevOps projects for ShaiHulud and React2Shell, as well as BSI alerts – Security Operations improvements across the SDLC.

• Deployment responsibility for the GenAI chat application, big data/AI platform (BDAI), and data science workspaces (AVD/VM-based) in the respective landing zones.

• Deployment & release management: end-to-end responsibility for deploying portal and service applications across multiple Azure landing zones, including technical approvals, compliance with development team deployment guidelines, and ensuring ITIL-based change and release processes via ServiceNow.

• Azure landing zones & network architecture: design, provisioning, and operation of Azure landing zones for 3-tier web applications with enhanced network segmentation, VNet peering, hub-and-spoke architectures, private endpoints, and firewall integration across separate subscriptions and tenants.

• Azure DevOps governance & operations: ownership of the Azure DevOps organization, including projects, repositories, and CI/CD pipelines; implementation of governance requirements such as branch policies, approval gates, permission models, and audit-ready operating structures.

• Infrastructure as Code (Terraform): design, implementation, and operation of a modular Terraform architecture for standardized cloud infrastructure deployment, including state management, provider versioning, reusability, and policy-as-code approaches.

• CI/CD pipeline engineering: design, operation, and optimization of complex YAML-based CI/CD pipelines with multi-stage deployments, template standardization, self-hosted agents, integrated secret management, and automated quality and security checks.

• Git migration & platform consolidation: planning and execution of repository and pipeline migration from Azure DevOps to GitLab CI/CD, including automated scripts, full Git history transfer, pipeline porting, and platform consolidation.

• Container & platform operations (AKS): operation and security assessment of containerized workloads on Azure Kubernetes Service, centralization of on-premises container registries for ACR.

• OpenShift (OCP) security reviews: security assessment of code baselines, build pipelines, and deployment processes for on-premises OpenShift clusters with critical applications, and derivation of specific hardening recommendations.

• Shift-left security & DevSecOps transformation: introduction of a company-wide shift-left approach for early security integration in development and deployment processes, enabling developers to perform self-led security checks and sustainably reduce vulnerabilities before production (IDE integrations, pre-commit hooks, local scanners).

• Software supply chain security: analysis and mitigation of supply chain risks in NPM- and Yarn-based applications through dependency audits, CI/CD pipeline hardening, token rotation, and restriction of risky build and lifecycle mechanisms.

• Frontend & framework security (React / Next.js): security assessment and coordination of critical vulnerability remediation across platform applications and web frameworks, including coordination and complementary technical mitigations with all teams following BSI alerts.

• Software composition analysis (SCA): introduction and operation of automated vulnerability scans for container images, pipelines/artifacts, and third-party dependencies, including SBOM exports within CI/CD pipelines.

• SAST/DAST integration: design and piloting of static and dynamic application security tests in close collaboration with security architecture and development teams, for continuous improvement of code and runtime security, and establishing operational acceptance tests.

• Artifact & registry consolidation: analysis and consolidation of all package and container repositories for service applications and AKS workloads, aiming for a centralized, secured registry strategy with centralized vulnerability scanning and governance.

• Dependency-Track & SBOM strategy: advising the compliance board on introducing a central SBOM and vulnerability management platform to increase enterprise-wide dependency transparency and accelerate CVE response capability.

• CI/CD pipeline hardening: security analysis and cleanup of the existing pipeline landscape by removing unused pipelines, improving secrets hygiene, implementing least-privilege principles, and isolating build agent environments.

• Azure Web Application Firewall (WAF) optimization: analysis and tuning of existing Azure WAF rules (OWASP Top 10 Core Rule Set, DSR/SDC, custom rules) to defend against known vulnerabilities and exploit patterns, including reducing false positives and improving threat detection.

• Documentation & stakeholder communication: creating and maintaining technical documentation, runbooks, and architecture overviews in Jira and Confluence, as well as active knowledge transfer between operations, development, security, and compliance stakeholders.

• End-to-end responsibility for the successful implementation and continuous optimization of Mediatool for strategic media planning (offline & online).
• Development and management of efficient onboarding, configuration, and support processes for international stakeholder teams.
• Leadership of API integrations to connect external systems (e.g., for result tracking and performance measurement).
• Advising departments on tool usage and development, including workshop design, training, and knowledge transfer.
• Establishment and maintenance of comprehensive PMO tracking for all tasks, milestones, and deliverables.
• Prioritization and documentation of requirements, change requests, and bugs in Jira, with transparent communication via Confluence.
• Systematic evaluation of user feedback to derive data-driven optimization measures.
• Responsibility for the monthly Mediatool communication newsletter, including content creation for users and leadership.

• Group-wide transformation program to replace a legacy Lotus Notes/Domino application landscape with a standardized, multi-tenant SharePoint Online target platform for the Italian Raiffeisen banking group.
• Total scope:
• 21 legally independent banks
• approx. 350 live Notes databases
• several thousand end users
• parallel operation of legacy and cloud platforms
• high regulatory requirements (audit, traceability, governance)
• Program designed as application, organizational and platform transformation – not just a technical migration.
• Definition of multi-tenant target architecture based on SharePoint Online
• Design of tenant separation including security, permissions and governance model
• Analysis and classification of Notes applications by criticality and complexity
• Definition of migration strategies (standard migration, redesign, retirement)
• Development of a multi-stage migration approach (pilot, test, production)
• Planning of fallback, rollback and stabilization measures
• Technical support and quality assurance of migration runs
• Development of automations (PowerShell, WebParts)
• Central technical interface between central IT, bank tenants, business departments and service providers
• Support in escalations and critical decision situations
• Technologies: SharePoint Online, Microsoft 365, Azure, PowerShell, Quest Notes Migrator

• Optimization of the transmission media of the data links in the Ruhr area
• Configuration/expansion of switches and routers for an autonomous system AS
• Improve the network protocols used Layer 2/3 (OSI model), RSTP, broadcast, etc.
• Laying cables, crimping, antennas, routers, switches
• Maintenance, expansion, selection and prioritization of troubleshooting measures for network monitoring (PRTG, The Dude)
• Organization and new connection of another BGP peering, data center, NGN fiber optic
• VPN IPSec site connections for 6 sites with PFSense, Fritzbox
• Configuration of WLAN devices (Mikrotik, UBNT

Label: TCP/IP, VLAN, BGP, OSPF, MPLS, VPLS, routing protocols, WLAN, EoIP, PPPoE, routing, SNMP, DHCP, DNS, NAT, native IP, VLAN, Ethernet, VoIP., switches and routers from: Nortel, Cisco, MikroTik, UBNT., network management systems: The Dude, PRTG, UISP

Project: Process optimization & IT support in an insurance broker office.

Project activities:

• Analysis of processes and definition of requirements
• Consulting on the implementation of a cloud solution (soho)
• Installation and verification of new infrastructure HW
• Cloud installation & configuration
• Definition and creation of use cases
• Execution of user acceptance tests (UAT)
• User training / training
• IT support (cloud, PC, server, printer, network)

Label: insurance, infrastructure, configuration, training, support

• Further development of the existing SCCM 2509 implementation
• Schema extension, CAS extension
• Creating task sequences, in-place upgrade
• Patch management (WSUS)
• Security updates, feature updates
• Emergency fixes, application updates
• Incident, change, and problem management (3rd level)
• Active Directory, DNS, DHCP, GPMC
• Managing users, groups, OUs, computers
• Setting up GPOs
• Senior consultant for software packaging in an SCCM 2509 environment
• Project management ITIL standards
• Defect management
• SIT (Software Integration Test)
• SAT (Software Acceptance Test)
• UAT (User Acceptance Test)
• Adjusting Windows 11 25H2 client deployment
• Secunet SINA management systems administrator
• Secunet SINA Workstation 3.5.4
• Maintenance and configuration work in SINA management
• Importing and adjusting IPsec policies
• Retrieving and documenting status, firmware versions, and configurations of individual SINA devices
• Consulting and implementation in fault and incident management
• Implementation of documentation and rollout of new software versions
• Creating software packages based on PowerShell App Deployment Toolkit, Flexera AdminStudio for the W11 64-bit platform and Server 2025 / 2022
• Number of PC systems: approx. 1,850.

Label: PowerShell, VBS, Batch scripting

Label: SCCM 2503, Windows 11 64 Bit, Windows 2025 Server, Windows 2022 Server, Windows 2019 Server

• Project: ESU Windows and SQL Server consolidation / Configuration Management in ServiceNow
• Creation of an as-is analysis of all servers worldwide
• Creation of an as-is analysis of all SQL servers worldwide
• Creation of requirements analyses for SQL and server migrations
• Coordination of requirements with partners for migrations to Hyper-V (on-premises) or Azure Cloud
• Moderation of jour fixe meetings
• Creation of roadmaps and solution models for server migrations
• Setup of test scenarios
• Moderation of workshops for the introduction of a Global Admin Team
• Creation of data models (CMDB) in ServiceNow
• Conducting workshops for the CMDB data model
• Creation of solution models for the CMDB
• Creation of seamless configuration and work documentation for the CMDB
• Creation of reports for license management
• Creation of KPIs for data quality in ServiceNow
• Creation of a service catalog
• Moderation of workshops for creating service requests
• Interface between needs analysis and ServiceNow development team
• Systems used: Windows 7, Windows 10, Microsoft Office 365/2010, Windows Server 20xx, SQL Server 20xx, SharePoint, Azure Cloud, Hyper-V, ServiceNow, various tools

• New development of a web app to manage and configure counting devices for large events
• Technologies: .NET 10, C#, Blazor, MudBlazor, MySQL, Git

• Devised a new Domain-Driven Design architecture for a core system: reverse-engineered a central component, refactored the data-access layer to minimise database round-trips (improving scalability) and migrated processing to async.
• Decomposed the platform into independent .NET Core microservices (database-per-service) with RabbitMQ pub/sub using the Outbox Pattern + Saga choreography, behind an Ocelot API Gateway (JWT, rate limiting, CORS, health checks).
• Delivered on .NET Core / Angular / SQL Server / EF Core with Docker and Azure DevOps CI/CD; implemented health checks and CORS; contributes technical designs for stories in agile Scrum.
• Sole ADR owner; mentored 3 engineers and presented architecture decisions directly to the Director of Corporate IT.

• Project Manager / Rollout Manager
• SDA-LAN 2.0 project
• Project management in the SDA-LAN area: planning the replacement and reconfiguration of network components, coordinating migrations with service consultants, technicians, and business stakeholders, overseeing migrations and serving as the contact person for the on-site team, scheduling with the client and service provider, planning and review meetings, risk management, escalation management
• Team size: 15 – 40 people
• Tools: Windows 11, Microsoft 365, Sharp CMDB, Confluence

• Structured analysis and evaluation of business processes

• Gathering, documenting, and prioritizing requirements

• Creating business-friendly and technically executable process models

• Use of Camunda tools

• Deriving requirements and interfaces from BPMN diagrams

• Coordination with stakeholders and business units

• Translating business requirements into technical solution designs

• Implementing efficient and tailored applications

• Systematic collection, analysis, and documentation of requirements

• Prioritizing and validating requirements in close collaboration with stakeholders

• Alignment between business and development to ensure shared objectives

• Creating use cases, user stories, and acceptance criteria

• Continuous requirements and change management throughout the project lifecycle

• Define project goals and create project plans

• Delegate tasks and monitor project progress

• Monitor budgets and inform stakeholders

• Mendix: Architecture, development, and maintenance of custom applications (Microflows, Domain Model, Security, XPath)

• Modeling Mendix workflows for process optimization

• Develop scalable apps with Mendix including REST/SOAP integration with SAP, SQL, Azure & SharePoint

• UI design for Mendix using Atlas UI, Fluent UI, HTML, CSS, JavaScript

• Develop web & mobile apps with Mendix using agile methods (Scrum, Kanban)

• Implement business logic with Mendix Microflows and Nanoflows

• Performance optimization and architecture improvements for Mendix applications

• Conduct Mendix training

• Create technical documentation and best practices for Mendix

• Coaching and mentoring for low-code development with Mendix