Freelancer profile translated to English.

Description

I am a seasoned engineer with over 30 years of hands-on experience across Unix system administration, software development, infrastructure automation, cybersecurity, and cloud computing.

Throughout my career I have helped organizations of all sizes build reliable, secure, and scalable systems — from hardening legacy environments to architecting modern cloud solutions.

What I can do for you:

Infrastructure automation — streamline and automate your infrastructure to reduce manual overhead and eliminate human error
Security integration — embed security requirements directly into your build and deployment pipelines (DevSecOps)
Software development — design and build robust software tailored to your specific needs

Why work with me?

With three decades of real-world experience, I bring both deep technical knowledge and a pragmatic mindset. I don't just deliver code — I deliver solutions that work in production.

Interested in collaborating? Feel free to reach out and let's discuss your project.

Languages

Dutch
Native or bilingual
English
Fluent

Workplace preferences

Can work on-site

Antwerpen (up to 50km), Brussel (up to 50km)

Mask27.dev
Independent Security, Linux, Unix & Cloud System Engineer
October 2023 - Today (2 years and 8 months)
Owner

I am an engineer with over 30 years of experience in Unix system administration, software development, system development/automation, cybersecurity, and cloud computing.
Federal Public
DevOps Engineer
October 2023 - Today (2 years and 8 months)
Brussel, Belgium
Freelance assignment.

◦ Migrated Kubernetes setup from OpenShift 3 to OpenShift 4.
RedHat OpenShift, Ansible, GitLab
◦ Migrated virtual machines from OpenStack to VMware.
OpenStack, VMWare, Ansible, Docker, Docker Compose, Docker Swarm
◦ Improved monitoring setup.
Prometheus, Grafana, AlertManager, Ansible, GitLab, Loki, ELK Stack (Elasticsearch)
◦ Reviewed CI/CD pipelines and created new architecture to deploy the applications with Helm.
GitLab, Ansible, Terraform, OpenShift, Kubenetes, Helm, Helmfile, ArgoCD, Docker, Podman
◦ Security review and architecture.
GitLab, Trivy, Syft, Grype, Kubescape, SonarQube, OpenSCAP, SBOM, OWASP dependencytrack, OWASP CycloneDX, RedHat Satellite
◦ Upgraded GitLab from 15 to 17. Reviewed/Improved pipelines and automation setup. GitLab, Semaphore, Ansible, Terraform
◦ Implemented secret management solution.
Kubernetes, OpenShift, External Secrets Operator (ESO), Vaultwarden, Ansible, Hashicorp Vault, OpenBao, Azure Key Vault, Secret Store CSI Driver, Hashicorp Vault Secret Operator (VSO)
◦ Setup and maintain the Docker build environment for our developers. Docker, Docker Compose, Docker Swarm
◦ Setup SSO for Java applications.
Kubernetes, OpenShift, Keycloak, LDAP, Active directory
◦ Reviewed Hybrid cloud setup
Kubernetes, OpenShift, Amazon AWS, Microsoft Azure, Terraform
◦ Automate certicate renewal process
Kubernetes, OpenShift, cert-manager, Hashicorp vault PKI, Ansible, ACME, Certbot
Kubernetes Hashicorp Vault OpenShift Linux Docker
GIMV
Tomcat Security Engineer
February 2025 - April 2025 (2 months)
Antwerpen, Belgium
Freelance assignment (short-term project)

◦ TLS configuration for Tomcat.
Tomcat, OpenSSL, Nmap
TLS Apache Tomcat Nmap IT Security OpenSSL