• Leading the GitLab Enterprise migration from Bitbucket and Jenkins in a highly regulated insurance environment. Responsible for the target architecture, migration strategy, and standardization of CI/CD workflows across development teams.
• Designed and implemented the integration of GitLab with OpenShift and Google Cloud, enabling secure, scalable build and deployment pipelines. Established GitOps-based delivery using ArgoCD, including repository structures, environment separation, and controlled promotion workflows.
• Defined platform standards for Infrastructure as Code and build automation, supporting tools such as Terraform, Helm, container-based build pipelines, and policy-driven deployments. Ensured compliance with internal security, audit, and governance requirements throughout the migration and platform rollout.

• Founded and currently leading Jongerius & Partner IT Consulting, driving the strategic vision and operational excellence of the company.
• Overseeing all aspects of the business including client acquisition, project management, and team leadership.
• Responsible for business development, ensuring sustained growth and establishing strong client relationships.

• I am responsible for the architecture, design, and operation of KfW?s cloud and DevOps platforms, with a primary focus on Azure and GitLab in a highly regulated enterprise environment. My role spans cloud architecture, platform engineering, and DevOps governance, supporting multiple product and delivery teams.
• I lead the strategic migration from Azure DevOps to GitLab, defining target architectures, CI/CD standards, security controls, and operating models while ensuring stability of existing delivery pipelines and developer productivity.
• A core responsibility is the end-to-end architecture and foundation of the HashiCorp Vault Enterprise platform. I designed and established a highly available Vault cluster on OpenShift, serving a hybrid and multi-cloud environment (on-premises and Azure), including secure integration with GitLab (JWT authentication for CI/CD) and OpenShift (Kubernetes authentication for workloads).
• AWS is used as a secondary / backup cloud, aligned with the overall cloud architecture and automation standards.
• In addition, I act as a technical authority and trusted advisor, supporting architectural decisions, resolving complex platform issues, and continuously improving security, automation, and scalability across the cloud landscape.

• Supported DVAG in a focused Azure Landing Zone architecture review and the secure modernization of their Azure platform. Key responsibilities included the migration of core services to Private Endpoints, significantly reducing public exposure and improving the overall security posture.
• Designed and reviewed a hub-and-spoke network architecture based on Azure Virtual WAN, including routing, Private DNS, and network segmentation. Infrastructure was implemented using Infrastructure as Code with Bicep and automated via GitHub-based CI/CD pipelines.
• Provided architectural guidance for Azure AKS environments, including private cluster setups, identity and access management, and integration with core Azure platform services.

• I was responsible for the architecture, modernization, and operation of AWS-based cloud platforms for energy-sector workloads. My role covered cloud architecture, DevOps engineering and infrastructure automation, with a strong focus on scalability, resilience, and security.
• I designed and evolved AWS reference architectures and Kubernetes (EKS) platforms, defining standards for networking, identity, CI/CD integration and runtime security. This included enabling high availability and multi-region architectures and improving overall platform reliability.
• In addition, I acted as a technical authority for cloud and Kubernetes topics, driving automation, GitOps workflows and secure platform integrations across delivery teams.

• Designed and implemented the entire Office 365 platform, including Exchange Online, SharePoint Online, and Teams.
• Configured and managed Azure Active Directory for seamless integration and single sign-on (SSO) capabilities.
• Established and maintained device management using Intune and AutoPilot, ensuring secure and efficient management of all company devices.
• Developed and deployed a comprehensive cloud telephony system, enhancing communication and collaboration across the organization.
• Assisted in the implementation of an intranet platform SaaS solution, facilitating better internal communication and resource sharing.
• Created and managed various Azure Functions for synchronizing Exchange data with the customer's CRM using Microsoft Graph, improving data consistency and accessibility.
• Conducted regular security assessments and implemented best practices to ensure compliance and protect company data.
• Provided training and support to end-users, ensuring smooth adoption and efficient use of the new Microsoft 365 tools.
• Set up and automated the entire deployment and configuration process using PowerShell scripts and Microsoft Endpoint Manager.
• Implemented advanced threat protection and compliance solutions, including Microsoft Defender for Office 365 and data loss prevention (DLP) policies.
• Monitored and optimized the performance of the Microsoft 365 environment, ensuring high availability and reliability.

• Leading the migration of Hamburg Airport's on-premises infrastructure to the Azure Cloud.
• Designing the entire cloud and hybrid cloud environment, encompassing storage solutions, SQL and NoSQL databases, message broker systems and Kubernetes services
• Implementing comprehensive CI/CD pipelines using Azure DevOps, GitLab and Terraform.
• Ensuring seamless integration and optimization of cloud resources to enhance operational efficiency and support the airport's digital transformation initiatives.

As a contractor of NordCloud (an IBM company), I am working for customers in the financial industry throughout Germany and support them with their transformation into the public cloud (Azure and AWS). I fully cover the areas of technical project management, DevOps engineering and solution/ cloud architecture for both AWS and Azure.

• Mainly I was supporting KfW (Kreditanstalt für Wiederaufbau) in designing and operating their Azure and Azure DevOps cloud landscape as well as in the gradual migration from Azure DevOps to GitLab. AWS was used as backup cloud.

• Designing, implementing, and operating the cloud platform (AWS)
• Designing software for IoT devices using .NET 6+ and Yocto Linux
• Creating functions for sensor communication, reading raw data from the machine sensors, and performing further processing
• Designing the CI/CD platform based on Azure DevOps, GitHub
• Maintaining the IoT landscape with Docker, Ansible, Terraform and ArgoCD
• Deploying and managing Kubernetes (EKS) with Terraform
• Implementing service mesh with Istio
• Global load balancing with AWS CloudFront and Route53
• Ensuring observability with Grafana, Grafana Loki, Prometheus, and Jaeger Tracing
• Architecting MSSQL, MongoDB, TimeStream, and DynamoDB databases
• Implementing OAuth and SSO with KeyCloak, Cognito, Okta, and Azure AD
• Optimizing the software development process, including introducing tools to increase software quality (Azure DevOps, SonarQube, Snyk, DevOps CI/CD/CT processes) and compliance
• Technical project management

• I have advised the customer on migrating existing on-premises workloads to the cloud. 
• As a Cloud/ Solution Architect, I managed the entire planning of the Azure solution, particularly Azure Kubernetes Services and related services, as well as hybrid cloud integration and connection to on-premises systems via VPN and ExpressRoute (including SAP and local databases). 
• I provisioned the entire Azure environment using Terraform and set up the associated release pipelines using Azure DevOps.