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
AnyLinQ B.V.
Den Bosch, The Netherlands
CISO / Security Officer / DevOps Engineer / Internal IT
Jun 2022 – Sep 2025
- 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 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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."
- +31 6 29 38 35 72
- [email protected]
- roethof.net
- ronnyroethof.nl
- Lelystad, The Netherlands
📄 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
- DutchNative
- EnglishFluent
Interests
- Blogging
- Cars
- Cybersecurity
- Open Source
- Family
- Fishing