Ronny Roethof

Profile

Driven IT specialist and Linux Administrator with 25+ years of experience in Linux, security, and network technology. Specialized in open source, cloud solutions, high availability, and security. Experienced in roles such as system administrator, migration and automation specialist, architect, team lead, and security engineer. Combines strategic insight with hands-on execution in complex environments and does not shy away from a challenge.

Experience

SPIE Data Solutions B.V.

Den Bosch, The Netherlands

Expert in Open Source, Security & High Availability

Sep 2025 – Present

Acquisition of AnyLinQ BV by SPIE Nederland

    AnyLinQ B.V.

    Den Bosch, The Netherlands

    CISO / Security Officer / DevOps Engineer / Internal IT

    Jun 2022 – Sep 2025

    Responsible for security, compliance, and internal IT infrastructure. Ensures safe and reliable operations.
    • Manages information security, privacy, and data integrity.
    • Develops, implements, and maintains policies.
    • Executes and ensures ISO 27001 / 27002 / NIS2 compliance.
    • Ensures secure, fast, and reliable access to data and applications.
    • Managed and optimized internal IT infrastructure (hardware, network, and software), guaranteeing operational reliability and security.
    VMware Proxmox Debian CentOS FreeBSD Windows Server Azure Ansible Huawei Fortigate GDPR ISO27001 ISO27002 NIS2

    Security Consultant / Pentester

    Nov 2021 – Jun 2022

    Performed pentests on websites, infrastructures, and applications, resulting in secure client environments.
    • Performed blackbox, graybox, and whitebox tests.
    • Improved security levels for clients.
    • Drafted advisory reports following security assessments.
    Kali Linux Debian Ubuntu VMware Cisco Juniper Huawei Fortigate

    RIVM / KNMI (Seconded via AnyLinQ B.V.)

    Bilthoven, The Netherlands

    Area Product Owner / Teamlead / Senior Devops Engineer

    Oct 2020 – Nov 2021

    Led the Specific Hosting Team, responsible for hosting RIVM.nl, KNMI.nl, and lead developer for Covid-19 registration infrastructure.
    • Developed Ansible playbooks and roles according to Infrastructure-as-Code and High Availability principles.
    • Automated test execution and deployment in CI/CD pipelines.
    • Built and implemented the complete infrastructure for the Covid-19 registration system and the National Vaccination Program, including Ansible automation for rapid scaling.
    • Worked with high commitment and flexibility under crisis conditions (night work, hundreds of overtime hours) to meet deadlines and ensure continuity.
    VMware Red Hat Ansible Tower Puppet GitLab Satellite IPA MySQL PostgreSQL Oracle

    Confidential Client (Seconded via AnyLinQ B.V.)

    Confidential, The Netherlands

    Developer / Senior System Engineer

    Jul 2019 – Sep 2020

    Worked in a highly secured environment focusing on PKI, data encryption, and secure computing.
    • Developed PHP Framework for internal development.
    • Wrote custom dashboards and tools for internal use.
    • Implemented complex automation projects with Ansible Tower.
    • Managed over 100 virtual servers on VMware/Red Hat platform.
    VMware Red Hat PHP Python Ansible Tower GitLab Satellite

    Neostrada B.V.

    Lelystad, The Netherlands

    Senior System Engineer

    May 2017 – Jun 2019

    Part of a 3-person team, responsible for 500+ physical hosting servers, 3500+ virtual machines, and a 5 PB offsite backup platform.
    • Developed Ansible playbooks and roles for applications.
    • Implemented and managed high availability clusters with 99.995% uptime.
    • Built Autobackup: FreeBSD ZFS-based 5PB backup platform.
    • Realized 24/7 monitoring and alerting.
    CloudLinux CentOS Debian FreeBSD Apache Nginx Exim cPanel DirectAdmin NFS ZFS Ceph Ansible Git KVM Proxmox Docker Huawei Switches HP Switches Dell PowerEdge HP ProLiant SuperMicro

    Liberty Global B.V. (Seconded via Ultimum B.V.)

    Amsterdam, The Netherlands

    Senior DevOps Engineer

    Jan 2017 – Mar 2017

    Was part of a 9-person team, responsible for the design and construction of the Operational Data Hub (ODH), part of the One Back Office (OBO) platform. This platform served for real-time performance analytics based on CPEs, BSS, and OSS. Designed, implemented, and documented Ansible roles and automated the installation of systems.
    • Designed, implemented, and documented Ansible roles.
    • Automated system installation.
    • Realization of real-time analytics environment.
    CentOS Red Hat Ansible Docker Zookeeper Kafka Flume HDFS Spark Logstash Elasticsearch Dell PowerEdge

    Ultimum B.V.

    Almere, The Netherlands

    Security Consultant

    Nov 2016 – Jan 2017

    Performed security tests on websites, infrastructures, and applications using blackbox, graybox, and whitebox techniques. Hosted security workshops for colleagues and clients and resolved security incidents.
    • Designed, implemented, and documented workshop VMs.
    • Conducted security workshops.
    • Performed pentests (blackbox/graybox/whitebox).
    • Resolved security incidents.
    • Performed migration and maintenance of all Ultimum websites.
    Kali Linux Debian Ubuntu VMware vSphere Ansible

    Meyn B.V. (Seconded via Ultimum B.V.)

    Oostzaan, The Netherlands

    DevOps Engineer / Automation Specialist

    Sep 2016 – Nov 2016

    Developed a central deployment platform for various virtualization technologies and in-house software products, based on Kickstart and Ansible. From this platform, the entire virtualization platform could be deployed and managed at external locations.
    • Designed, implemented, and documented virtualization environments.
    • Set up and managed configuration management.
    • Developed and rolled out software deployment.
    CentOS Ansible Citrix XenServer Git Icinga Ruby Perl Kickstart Dell PowerEdge

    Ultimum Managed Services

    Almere, The Netherlands

    Linux Engineer

    Jun 2016 – Sep 2016

    Performed various Linux/Unix and Open Source tasks, including management and migrations of complex client platforms (Slackware 13, Keepalive, Zebra, OpenVPN, Amazon AWS). Final responsibility for multiple migrations.
    • Provisioned and managed servers and VMs.
    • Provisioned Docker environments.
    • Automated systems and performed hardening with Ansible.
    • Performed migrations of DNS and web servers to managed and hardened platforms.
    • Set up VPN connections between networks.
    • Migrated client infrastructures to AWS.
    • Virtualized databases.
    • Rolled out monitoring.
    Red Hat CentOS Debian Slackware Ubuntu Amazon AWS VMware vSphere Ansible Nagios Docker PRTG Fortigate Cisco HP Procurve

    SLTN (Seconded via Ultimum B.V.)

    Hilversum, The Netherlands

    System and Monitoring Architect

    Mar 2016 – Jun 2016

    Developed 24/7 monitoring platform for a large telecom supplier with central management of multiple locations. Automated rollout of monitoring nodes and new checks, taking security requirements into account.
    • Provided technical input for High Level and Detailed Level Design.
    • Designed and implemented Linux monitoring servers.
    • Automated rollout of monitoring nodes and checks.
    • Documented and provided technical consultation.
    CentOS 7 Nagios MySQL Ansible HP Blades HP 3PAR Storage HP Switches HP Routers

    Merus N.V. (Seconded via Ultimum B.V.)

    Utrecht, The Netherlands

    Linux Engineer / Database Recovery Specialist

    Dec 2015 – Mar 2016

    Replaced a defective database platform; implemented a new PostgreSQL cluster on HyperV, crucial for oncology research.
    • Implemented Linux systems.
    • Implemented and fine-tuned PostgreSQL.
    • Documented and provided technical consultation.
    Ubuntu 14 PostgreSQL HyperV

    FD Mediagroep B.V. (Seconded via Ultimum B.V.)

    Amsterdam, The Netherlands

    Linux Engineer / Network Engineer

    Feb 2015 – Nov 2015

    Managed Linux/Solaris systems, network equipment, storage systems, and related hardware/software. Managed transition from Solaris to Linux, replaced storage and backup environments, and automated monitoring.
    • Phased out Solaris environment to Linux.
    • Renewed storage and backup solutions.
    • Implemented failover site.
    • Automated with Ansible.
    CentOS 6/7 Debian 7/8 Ubuntu 12/14 Solaris 8/9 VMware vSphere 5/6 Ansible Nagios Cisco HP Procurve HP Lefthand

    Tele2 Nederland B.V. (Seconded via Ultimum B.V.)

    Diemen, The Netherlands

    Senior System Engineer

    Feb 2014 – Feb 2015

    Managed Linux, HP-UX, Solaris, and SunOS systems with a focus on high availability and load balancing. Developed HA solutions for 9292.nl, LDAP, and central logging.
    • Set up HA load balancers with HAProxy, KeepAlived, and Nginx.
    • Implemented HA LDAP system.
    • Designed central logging with Logstash, Elasticsearch, Kibana, and Graphite.
    • Daily management of servers and monitoring tools.
    Red Hat CentOS Debian Solaris VMware OpenLDAP Active Directory Dell Netvault F5 BigIP A10 Load Balancers

    eBay Classifieds Group (Seconded via Ultimum B.V.)

    Amsterdam, The Netherlands

    NOC Engineer

    Jan 2013 – Feb 2014

    Managed monitoring and developed monitoring tools for eBay platforms and various marketplaces. Management of over 2000 virtual servers and daily troubleshooting.
    • Migrated and managed servers and virtualization.
    • Daily management of Debian and Ubuntu systems.
    • Set up monitoring with Nagios, Zabbix, Graphite, Cacti.
    • Automated systems with Puppet and Passenger.
    • Coached team members and handled inquiries.
    Debian Ubuntu SVN Mercurial Git Puppet Nagios Graphite Cacti

    YourHosting B.V.

    Zwolle, The Netherlands

    Senior System Engineer

    Jan 2012 – Dec 2012

    Managed Linux hosting servers, provided technical input, and designed webmail and KVM clusters as well as Puppet configuration.
    • Designed and managed webmail clusters.
    • Designed and managed KVM virtualization clusters.
    • Designed and managed Puppet in combination with Passenger.
    • Maintained and resolved issues in Linux/Unix servers.
    • Maintained mail and web hosting clusters.
    • Implemented and managed Nagios monitoring.
    CentOS Ubuntu Apache MySQL Postfix SendMail Courier Git Puppet Nagios Graphite Cacti

    News Service Europe B.V.

    Amsterdam, The Netherlands

    Linux System Administrator / Senior System Engineer

    Apr 2011 – Dec 2011

    Management of all Debian Linux systems and the Usenet platform based on it. News-Service Europe was among the global top 3 newsgroup providers. Provided 24/7 support and monitoring within a 7-person team. Co-responsible for system designs, implementations, and maintenance of critical infrastructure.
    • Designed, implemented, and managed KVM clusters.
    • Designed, implemented, and managed Puppet configuration systems.
    • Maintained and resolved Linux/Unix server issues.
    • Maintained custom Debian packages and mirrors.
    • Maintained Usenet clusters and storage platforms.
    • Maintained mail and web hosting clusters.
    • Implemented and managed Nagios monitoring.
    500+ fysieke servers Dell PowerEdge Dell PowerVault SuperMicro Storage Debian 5 MySQL PostgreSQL KVM Apache 2 Postfix Spamassassin Nagios Diablo NNTP

    ACN Europe B.V. (Seconded via InWork B.V.)

    Amsterdam, The Netherlands

    Linux System Administrator / Network Engineer

    Aug 2010 – Apr 2011

    Responsible for all Linux OS systems and development of tooling based on open source software. Also backup administrator for Windows environments, network administrator, and storage administrator.
    • Designed, implemented, and managed VMware clusters.
    • Designed, implemented, and managed Puppet configuration systems.
    • Designed, implemented, and managed Squid web filters.
    • Designed, implemented, converted, and migrated Exchange to Zimbra.
    • Implemented and managed Zabbix monitoring.
    • Backup network management (Juniper SRX240/EX4200, Cisco 9513/3650).
    • Backup Windows management (Windows 2003/2008, IIS 7, Exchange 2007).
    • Backup storage management (EMC CX3/4, EMC AX5).
    100+ fysieke servers HP ProLiant HP BladeCenters VMware ESX 3/4 CentOS 5.5 Windows 2003/2008 Cisco IOS JunOS MySQL 5 Apache 2 Postfix Spamassassin Zabbix Zimbra Samba IIS 7 MS Exchange 2003/2010 Active Directory Cisco Switches/Routers Juniper Switches/Firewalls EMCSAN Storage

    Leaseweb B.V.

    Haarlem, The Netherlands

    Senior System Engineer / Internal IT

    Dec 2008 – Jun 2010

    As the sole Linux Engineer responsible for all Linux and Unix systems at one of Europe's largest hosting parties. Involved in design, implementation, and management of internal and client environments. Provided support to development teams and responsible for continuity of business-critical services.
    • Designed, implemented, and managed internal network (Cisco ASA/2950/3650).
    • Designed, implemented, and managed Juniper VPN (SRX650).
    • Designed, implemented, and managed VMware ESX 4 environment.
    • Designed, implemented, and managed internal/external DNS servers.
    • Designed, implemented, and managed Voice over IP telephony and fax services.
    • Designed, implemented, and managed mail hosting clusters.
    • Designed, implemented, and managed web hosting clusters.
    • Designed, implemented, and managed Opsview/Nagios monitoring clusters.
    • Supported the programming department with changes.
    250+ fysieke/virtuele servers 5000+ klantservers HP ProLiant HP BladeCenters Dell PowerEdge SuperMicro Storage VMware ESX 3/4 Red Hat CentOS Debian Ubuntu FreeBSD Windows Server 2003/2008 Cisco IOS JunOS MySQL Apache 2 Postfix SpamAssassin Zabbix Zimbra Samba IIS 6/7 MS Exchange 2003/2010 Active Directory Cisco Switches/Routers Juniper Switches/Firewalls EMC SAN Storage Asterisk

    Education

    MAVO D

    Scholen Gemeenschap Lelystad

    1993 – 1995

    Certifications

    Commvault Certified Professional

    Commvault

    Jan 2026


    Red Hat Certified System Administrator (RHCSA 7)

    Red Hat

    Jun 2016


    ITIL® Foundation Certificate in IT Service Management

    EXIN

    Nov 2013


    LPIC-1, Linux Professional Institute Certified Administrator

    Linux Professional Institute

    Jan 2013


    References

    Chris Dorsman - Ervaren Python, Penguin & Whale Whisperer

    "“What you see is what you get” is the expression that comes to mind when I think of Ronny. I had the pleasure of working with Ronny for a year at the SC-Campus/RIVM Linux team where he was interim Area Product Owner/Senior Linux engineer and I was senior Linux Engineer. During this year we dealt with quite tough and tense projects within the COVID19 program, where we executed almost impossible projects (and usually succeeded). Apart from his humor, Ronny is one of the most hardworking, but also most capable and honest people I know. He would be a great asset for any technical and team lead position."

    Mark Maas - Kubernetes Engineer bij Defensie

    "Ronny knows his tech! There is nothing Ronny couldn't learn or invent. Ronny has a strong opinion but knows when to listen and incorporate those opinions into his own. If you've read Ronny's manual, there is nothing you can't achieve with him."

    Paul Commandeur - Linux/Unix Systeem Engineer bij Xifeo

    "I got to know Ronny at Tele2. Ronny is a good Linux engineer with knowledge of the field. He is a reliable colleague who works with passion and dedication."

    Sebastiaan Koot - IT Quality Lead @ the/experts

    "I got to know Ronny as an administrator who works very quickly and adequately. He is always willing to think further and outside the box. He is solution-oriented and professionally competent. Even when he encounters unknown material, he quickly familiarizes himself with it due to his broad technical basis."

    Harald Assenberg - Sr. Adviseur Bedrijfsvoering - Directie Informatietechnologie

    "Ronny is a good, honest, hard worker. He is very knowledgeable and not afraid to work extra hours to achieve his goal. I can speak from experience that he is an asset to any company with his great commitment. Injustice or unreasonableness is what he is allergic to. Furthermore, a top guy!!"

    John Gerritse - Linux Engineer bij Alliander NV

    "Ronny is a capable colleague who strives for the best result. He was a team player and did his work with utmost professionalism. I would definitely recommend Ronny and hope to work with him again in the future."

    Peter Ponsen - Senior Linux Engineer bij BrightCubes

    "Ronny is a valued colleague who has an extensive technical background in many systems and therefore can easily see the bigger picture. Thanks Ron!"

    Talip Karabas - Offensive Cyber Security Engineer | Penetration Tester | Ethical Hacker | DevSecOps Engineer

    "Ronny is a very skilled Senior system engineer with a lot of experience and a very good team player. It was a pleasure working with you Ronny!"

    Richard Pijnenburg - Oprichter van Eclectic Events, Eclectic DJ Collective en Eclectic Entertainment Group

    "Ronny is a very motivated and fun guy to work with. Enormous knowledge and not shy to learn from others."

    Tom Carrion Chrisstoffels - Software architect @ Thales

    "Skilled sysadmin. A pleasure to work with!"

    Reinier Haasjes - Senior DevOps & Infrastructuur Engineer | Schaalbaarheid & Automatisering

    "Ronny is a nice and social colleague to work with. He is dedicated, hardworking, and flexible. He has broad knowledge of Linux, Windows, and IT solutions and no 9-to-5 mentality. I can recommend Ronny for any position he would apply for."

    Arjan de Jong - Cybersecurity Architect bij Capgemini

    "Ronny is a very skilled administrator, he knows the ins and outs of his products, stays up to date with all new developments, and is open to other products/solutions that do not run on the Linux platform. He is a very nice guy to work with, listens to the opinions of others, and has good social skills. If you are looking for a highly qualified Linux administrator, Ronny will definitely get the job done for you!"

    Corné van der Vaart - Senior projectmanager bij Proximus Group

    "Ronny is a very skilled Senior system administrator with great knowledge of Unix / Linux and even Windows systems. Ronny does not mind working outside office hours or overtime. Because of his flexible attitude and professional IT solutions, he will be a stable factor within your company."

    Patrick Schreurs - Senior Privacy Consultant | LLM | BSc | CIPPE | CIPM | CIPT | FIP | FG

    "Ronny is a dedicated engineer with broad knowledge of System Administration. I experienced Ronny as a pleasant, easy-going, and dedicated colleague. It was a pleasure working with Ronny."

    Rachid Achellal - Security Engineer bij Conclusion Enablement

    "Ronny has knowledge of BSD, Linux, MySQL, VoIP, and much more. He has no 9-to-5 mentality and is always busy. He is helpful and you can ask him anything. It was a pleasure working with him."

    Mark Kerssens - Linux Engineer

    "I enjoyed working with Ronny very much. His dedication and skills taught me much of what I know today. I have no doubt that Ronny has a bright future ahead of him. Besides being a good colleague, he is also a nice person to deal with."

    Patrick Kievit - Integreert geautomatiseerde testen met softwareontwikkeling...

    "I have never seen anyone type commands so fast, truly amazing. No migration is too much for him and he does it with great dedication. Additionally, his cooperative approach contributed to the success of our projects. Ronny, thanks and I wish you good luck in the future."

    Thorsten Einig - Product, Domeinen en Business Development @ WHG

    "I have always appreciated Ronny as a very knowledgeable and helpful colleague. The pleasure he has in his work and with his colleagues complements his hands-on approach. Ronny tackles problems as they come and solves them quickly without losing the overview of his enormous area of responsibility and certainly without a 9-to-5 mentality."

    Thomas Weaver - Information Security Architect bij bet365

    "It was a pleasure working with Ronny, not only professionally but also socially. As the sole Senior Unix Administrator at LeaseWeb, he always had a lot of work to do, but still managed to achieve his goals and help others when they needed it. I have never worked with a more knowledgeable, helpful, and nice guy."

    Paolo Iannelli - Mega Labs

    "Ronny is not just a Unix System Administrator. He has broad and extensive knowledge of all Unix and Linux distributions and has the right knowledge to decide which one to choose based on specific project specifications. In most cases, he surprised me by talking about Trixbox, Asterisk at an advanced level, as well as Nagios performance tuning. Besides work, he is a good guy, always present when there is fun to be had. I would entrust my servers to him safely without any problems."
    photo of me

    📄 Download NL CV (PDF)
    📄 Download EN CV (PDF)



    Skills

      • Operating Systems
      • Linux
      • Debian
      • FreeBSD
      • Arch
      • Ubuntu
      • Red Hat Enterprise Linux (RHEL)
      • Unix
      • Windows Server
        Automation & Configuration Management
      • Ansible
      • Puppet
      • Kickstart
        Programming Languages & Scripting
      • Bash
      • Python
      • PHP
        Virtualization & Cloud
      • VMware
      • KVM
      • Xen
      • Proxmox
      • Hyper-V
      • Docker
      • Azure
      • Amazon AWS
        Networking
      • High Availability
      • HAProxy
      • Keepalived
      • VPN (OpenVPN)
      • Cisco IOS
      • JunOS
      • F5 BigIP
      • A10 Load Balancers
      • Cisco Technologies
      • Huawei Switches/Routers
      • HP Switches/Routers
      • Dell Switches
        Security
      • Firewalls
      • Data Encryption
      • PKI (Public Key Infrastructure)
      • Fortigate
      • Pentesting Tools
      • Kali Linux
      • GDPR
      • ISO 27001
      • ISO 27002
      • NIS2
        Directory Services
      • DNS
      • OpenLDAP
      • Active Directory
        Monitoring & Logging
      • Nagios
      • Zabbix
      • Graphite
      • Cacti
      • PRTG
      • Logstash
      • Elasticsearch
      • Kibana
        Databases
      • MySQL
      • PostgreSQL
        Web & Mail Servers
      • Apache
      • Nginx
      • Postfix
      • Exim
      • SendMail
      • Courier
      • Zimbra
      • IIS
        Version Control & CI/CD
      • Git
      • GitLab
      • Jenkins
      • Bitbucket
      • Subversion
      • Mercurial
        Server Hardware
      • Dell PowerEdge
      • HP Proliant
      • HP Blades
      • SuperMicro
        Storage Systems
      • ZFS
      • Ceph
      • NFS
      • HP 3PAR Storage
      • HP Lefthand
      • EMCSAN storage
      • Dell PowerVault
      • SuperMicro Storage
        Other & Concepts
      • System Administration
      • DevOps Principles
      • Open Source
      • ITIL
      • Usenet/NNTP
      • Apple
      • Asterisk
      • cPanel
      • DirectAdmin

    Languages

    • Dutch
      Native
    • English
      Fluent

    Interests

    • Blogging
    • Cars
    • Cybersecurity
    • Open Source
    • Family
    • Fishing