| Working Experience |
| Jan 2008 - Current |
Optiver Trading. |
Unix Systems Administrator and UNIX Tech Lead
- Maintaining 600+ servers. (Grew from 120 servers in 2008).
- Serverpark upgrades almost completely each year.
- Researching and investigating new technology.
- Pushed for, designed and initiated long term vision and planning.
- Designed and wrote webbased application in Django with MySQL backend administrating what hardware is in what state and what location.
- Design and build complete automatic Linux installation and configuration platform, leveraging live environment, puppet, HardWhere and gluecode.
- Instrumental in long term sponsoring of Open Source projects.
- Providing WIKI's to global company through a Mediawiki farm with AD integration.
- Implemented internal drupal-based Youtube-esque global website.
- Introduced Optiver to logging standards and rsyslog enabling faster and more resilient software.
- Introduced Optiver to Glusterfs enabling faster and more resilient software (#2).
- Actively provide feedback, ideas and constructive criticism to colleagues, teamleads and management.
- Responsible for interviewing and hiring UNIX, Windows and Database engineers.
|
| Juli 2007 - Dec 2007 |
the Waag Society for the Old/New Media. |
- Unix Systems and Network Administrator, maintaining 20+ servers. Mostly webservices and streaming servers.
- Network mostly cisco switchers and core router (6500), as well as an old ExteremeNetworks router.
- Responsible for giving shape to infrastructure of CultureGrid: a hosting provider for cultural organizations.
- Responsible for hosting-legacy of non-profit organization "DISC hosting".
- Implementing Password Management for Admins.
- Proposal: Embrace the usage of sudo (denied).
- Proposal: Usage of quotas on mission critical fileserver with limited space (denied).
- Designed and implemented development and website infrastructure for new Drupal-based hosting.
- Prevented imminent destruction of serverroom and possibly entire location.
- Improved service by implementing RequestTracker.
|
| Sep 2004 - June 2007 |
Netherlands Institute for Space Research. |
- Unix Systemsadministrator, maintaining 60+ Desktops, 20+ servers providing printing, remote access (ssh, ftp, sftp), web- and storage-services.
- Researched, implemented RequestTracker improving IT response time and customer satisfaction.
- Initiated and implemented versioning system for all software (subversion) and issue tracking (trac).
- Design and build Live Desktop environment available over PXE+NFS.
- Built own DEB and RPM packages.
- Used a meta-package and debconf to maintain consistency across entire site.
- Migrated from many different distros maintained by 4 different administrators to Debian.
- Compiling/packaging/debugging 3rd party astronomy and satellite software to Debian.
- Formulating Team Vision and Mission.
- Implementing small SANs (MSA1500 + 2x MSA20s and a MSA500) for storing satellite data.
|
| Sep 2003 - Aug 2004 |
Centre for IT and Media at the University of Utrecht |
- Systems Administrator and Supporttechnician.
- Responsible for backups (Veritas) of entire faculty.
- Standard desktop support.
|
| Mar 2002 - Aug 2003 |
DenIT Internet Services |
Systems Administrator.
- Maintaining 150+ Unix-like servers, as well as 30 Windows 2000 servers.
- Designed, wrote webadmin interface in PHP for Postfix + MySQL.
- Designed, wrote internal CRM and order-workflow for DSL customers.
- Responsible for backups.
- Day-to-day technical issues dealing with non.
- Assisted 3 times in datacenter move of 100+ servers.
|
| Oct 2000 - Feb 2002 |
Cistron Internet Services |
Helpdesk and technical support.
- Left after Cistron filed for Chapter 11.
- Responsible for rewriting and maintaining helpdesk-webpages to help customers.
- Standard helpdesk issues related to DSL and Dial-up.
|