Experience

KPN NetwerkNL

• Netherlands
• Telecommunications
• 1 - 100 Employee

• Kubernetes and Linux migration and devops

  • Oct 2020 - Present

  For KPN network I had to migrate over 30 applications in 3 envirronments (mostly Java) from old Linux machines to KPN managed kubernetes clusters. I developed the open source kreate framework (https://github.com/MarkHooijkaas/kreate-kube) to ease the standardisation over all these applications. As most experienced Linux user I also got the informal lead in maintaining that Linux infrastructure since there were no Linux sysadmins. This included several datacenter and network migrations. I worked mostly with kubernetes, kubectl, kustomize, rancher, docker, bash, python, docker, ssh, git, Jenkins Show less



Hooijkaas IT Consultancy

• owner

  • Dec 2005 - Present

  This is my own consultancy company for general IT consultancy, specializing in IT Architecture, Application integration, Internet technologies and software engineering. Although I started the company in 2005 and did some small freelance projects on the side, since July 2008 I am fully self employed, and do all my work form my own company. This is my own consultancy company for general IT consultancy, specializing in IT Architecture, Application integration, Internet technologies and software engineering. Although I started the company in 2005 and did some small freelance projects on the side, since July 2008 I am fully self employed, and do all my work form my own company.



ODCN

• Groningen, Netherlands

• Kubernetes DevOps specialist

  • Mar 2019 - Jul 2020

  At ODCN I worked in a team that provisioned Kubernetes clusters for government organisations in the Netherlands. The provisioning and upgrades were fully automated using Ansible+Python and the RedHat Openshift install and maintenance playbooks. The provisioned clusters were fully managed by our team with Elastic+filebeat+Kibana for logging, GitLab+Nexus+Harbor+Helm for CI/CD for customers and provisioning, Fluentd+Telegraf+InfluxDB+Grafana for monitoring, keycloak+openldap+haproxy+nfs+s3+velero for general infrastructure. Although for operational management we needed to be acquainted with all technology, my primary focus was on Kubernetes (OpenShift 3.11 and 4.3), Ansible, Python (2.7 and migration to 3.6), Linux (Redhat 7 and RHCOS), NFS Show less



Powerpeers energie

• Netherlands
• Renewable Energy Semiconductor Manufacturing
• 1 - 100 Employee

• ESB Camel + Java specialist

  • Oct 2018 - Apr 2019

  Powerpeers has an operations support system based on Java, Apache Camel ESB and Camunda BPM technology. For this team I did several maintenance jobs based on new business requirements. I also set up the system for Automated testing of Java code, Apache Camel routes and Camunda flows, using the JUnit based libraries for Camel en Camunda, and integrated this in the maven based development process Powerpeers has an operations support system based on Java, Apache Camel ESB and Camunda BPM technology. For this team I did several maintenance jobs based on new business requirements. I also set up the system for Automated testing of Java code, Apache Camel routes and Camunda flows, using the JUnit based libraries for Camel en Camunda, and integrated this in the maven based development process



Dienst Uitvoering Onderwijs (DUO)

• Netherlands
• Government Administration
• 700 & Above Employee

• Java ESB and BPM consultant and specialist

  • Dec 2006 - Mar 2018

  At DUO I functioned as general consultant on the introduction and use of ESB and BPM technologies. I developed the reference architecture for the ESB project. I consult for what purpose these technologies should and should not be used, what to expect on advantages and problems, depending how the ESB and BPM technologies are used. After that I worked as specialist for Integration Technologies in general, including IBM MQ, Cordys ESB, and a variety of platforms. During this assignment I have become an expert on the Cordys technology used. I sometimes do some highly technical Java development, realizing a Cordys As400Connector and an (open source) Cordys RelayConnector and HttpConnector. Show less



KPN

• Netherlands
• Telecommunications
• 700 & Above Employee

• freelance Architect, Cordys specialist

  • Nov 2009 - Mar 2010

  For an Order Intake and Order Fulfilment system for KPN Mobile, I was asked to help because of my Cordys expertise and experience with automated order fulfilment systems. For an Order Intake and Order Fulfilment system for KPN Mobile, I was asked to help because of my Cordys expertise and experience with automated order fulfilment systems.



Provincie Groningen

• Netherlands
• Public Policy Offices
• 700 & Above Employee

• consultant on open source ESB

  • Sep 2008 - Mar 2009

  The province of Groningen participated in a Proof of Concept on ESB (and BPM) technologies. The province of Groningen decided to focus on open source ESB technology. As a consultant I advised on general ESB issues, open source philosophy, and selected the open source technology to be used in the Proof of Concept (Apache ServiceMix). I also participated in some hands-on experiments and knowledge sharing. The province of Groningen participated in a Proof of Concept on ESB (and BPM) technologies. The province of Groningen decided to focus on open source ESB technology. As a consultant I advised on general ESB issues, open source philosophy, and selected the open source technology to be used in the Proof of Concept (Apache ServiceMix). I also participated in some hands-on experiments and knowledge sharing.



Atos

• France
• IT Services and IT Consulting
• 700 & Above Employee

• Architect and troubleshooter

  • Jun 2008 - Dec 2008

  As original architect of the Order Fulfillment Manager for KPN's Digitenne and InternetPlusBellen I was asked to help with some major changes, and for knowledge transfer to an offshoring team. It was nice to see a system I designed and partly built 3 years ago still functioning as planned. As original architect of the Order Fulfillment Manager for KPN's Digitenne and InternetPlusBellen I was asked to help with some major changes, and for knowledge transfer to an offshoring team. It was nice to see a system I designed and partly built 3 years ago still functioning as planned.



The Vision Web

• Netherlands
• IT Services and IT Consulting
• 1 - 100 Employee

• Consultant, Architect

  • Jan 2001 - Jun 2008

  Various consultancy assignments on website development, Java, Microsoft (.NET) and SAP technologies, resource planning and simulation and general architecture for a large retail organisation, a healthcare insurance company, an energy company and several government subsidiaries. Various consultancy assignments on website development, Java, Microsoft (.NET) and SAP technologies, resource planning and simulation and general architecture for a large retail organisation, a healthcare insurance company, an energy company and several government subsidiaries.



Ministerie van Economische Zaken en Klimaat

• Netherlands
• Government Administration
• 700 & Above Employee

• Technical architect Internet strategy program

  • Sep 2005 - Dec 2006

  The department of agriculture (ministerie van LNV) has an ambitious multi year programme for their Internet services to their relations (Electronisch Dienst Verlening). My role in this programme was as an technical architect to design an technical application architecture and decide on all related architecture issues in the programme's projects (over 30 projects). For this function I cooperated closely with all project managers, the business architect of the programme, and the regular technical architect of LNV. Show less



KPN

• Netherlands
• Telecommunications
• 700 & Above Employee

• Architect, senior developer

  • Dec 2003 - Jan 2006

  I was the technical architect and lead developer of a highly automated order transaction system for all telephony related orders and change request of the largest Dutch Telecom operator KPN. The system is a Java/J2EE based solution with a Staffware workflow engine and an Oracle database. The system is being used for all different types of order for the KpnTV and InternetPlusBellen product. I have been involved in the third line support and continuous development and improvement of the operations for over a year. Show less



PostNL

• Netherlands
• Transportation, Logistics, Supply Chain and Storage
• 700 & Above Employee

• Architect employee Portal site

  • Jan 2003 - Oct 2003

  The largest Dutch postal and logistics company, TPG, had an Intranet and Extranet Portal site for the top 1500 employees worldwide. This website was based using C#, ASP.NET, XML and XSLT, but had mayor architectural and operational problems, together with a long overdue wish list of new functionalities. I took over the architecture and responsibility for this website and solved the urgent problems, implemented a new part for a select subgroup, and transferred the website to a new news provider. Next I was involved to migrating the website to the new corporate wide Tridion Content Management implementation, including designing and developing the authentication and authorization mechanism. Show less



KPN

• Netherlands
• Telecommunications
• 700 & Above Employee

• Technical Architect, team coordinator

  • Nov 1999 - Dec 2000

  Development team coordinator and technical architect / project leader of all KPN e-commerce projects on the Microsoft platform. More specifically, an entry-level Merchant solution (netmerchant.nl), the KPN internet payment solution (NetTransact) and an auction service.

• Technical Architect, team coordinator

  • Sep 1997 - Oct 1999

  Development of web enabling customer information of KPN Telecom.Technical project leader and architect of the Intelligent Link Engine, a generic architecture for connecting to the legacy systems of KPN Telecom. As technical project leader responsible for a total of 20 team members ranging from Mount Everest trainees to Open Group specialists.



KPN Research

• Telecommunications
• 1 - 100 Employee

• Planning & Performance Researcher

  • Sep 1991 - Aug 1997

  Project member, project leader, Team leader of various projects concerning access networks. 6 month contract work in Tampa (Florida) at GTE Data Services for the wholesale billing system project for PTT Telecom. Team coordinator for Marketing & Sales Research at KPN Research with emphasis on Interconnect Strategy and Tactics for the Wholesale Market, supporting the interconnect pricing process with the regulator (OPTA) and new telecom operators Project member, project leader, Team leader of various projects concerning access networks. 6 month contract work in Tampa (Florida) at GTE Data Services for the wholesale billing system project for PTT Telecom. Team coordinator for Marketing & Sales Research at KPN Research with emphasis on Interconnect Strategy and Tactics for the Wholesale Market, supporting the interconnect pricing process with the regulator (OPTA) and new telecom operators