Johan A. van Zanten
Around 800 Debian servers based in two UK data centres. Brandwatch
crawls, collects, and sifts through what people are (publicly) talking
about on the Internet to meet its customers' requests. Data flows
through proprietary code, Kafka, Nginx, Tomcat, and into very large
PostgreSQL, Solr, and Hadoop databases and indices, and other tools.
|Service Reliabity Manager
(Previously Head of Materials Team, and Senior Systems Engineer)
|December 2012 - present |
|Brandwatch||Berlin (Germany) and Brighton (UK) |
Currently head of the Service Reliability team of six
people, which is Brandwatch's take on technical operations and SRE for the
core Brandwatch services.
Linux (Debian, CentOS, Fedora Core) servers and Mac OS X desktop
environment. HFT, low-latency proprietary trading. A large HPC
research cluster, and many trading machines in machine rooms in North
America and Europe. Cisco and Arista network kit.
Sysadmin for the campus' main Blackboard
server. Involves writing some Perl and other shell scripts
to munge data from other UT sources into formats to load
into Bb. Also some patching of Bb in Perl and Java. Tuning
of Solaris, JVM, Oracle, and NetScaler configurations for
a heavily used system. (Roughly 80,000 users, and as many
as 40,000 unique logins per day.)
Contract Solaris and Sun system administration via my own corporation.
|Systems and Network Administrator ||September 2007 - 2012 |
|RGM Advisors, LLC||Austin, TX. and London, UK |
Primary sysadmin for 25 Solaris 7 machines running Oracle, Apache,
ColdFusion, and other in-house applications.
System administration contract work via my own corporation.
(Work typically as below, lots of Sun and Solaris system administration in
Primary liaison to Sun Microsystems for the team, specified large
($500,000+) purchases, trained junior team members, established and
documented local team procedures. One of two senior Unix sysadmins in
team of ten who managed and supported approximately 70 24x7 production
and development Sun & IBM Unix servers running NIS, Kerberos 5,
DNS, Sybase, Oracle, and other vended packages and in-house
applications for the 5,000+ employee, multi-national corporation.
Emphasis on large Sun Servers (Sun E10000, E5000, etc.). Also
administrated the corporation's firewall and Internet connection.
As below, but additionally: Managed system group as it grew to eight
people, and the company grew from 35 to 120 people.
One of two sysadmins responsible for the complete maintenance and
management of 60 Unix machines (Sun, HP, RS/6000, Pyramid and
Sequent), 120 DOS and Macintosh systems and all network equipment in a
small but fast-growing software company. Managed and improved Internet
connection, mail service, dial-up service, USENET news feed, backups
and data escrow. Installed and maintained all new hardware, operating
system and software packages on the Unix machines, as well as
recommended all machine purchases.
Junior admin in group that managed campus-wide, heavily-used Unix
systems (Ultrix, SunOS 4 and BSD), which had a collective user
community of about 15,000 people. Quickly took on additional
system administration duties, such as installation of operating systems
and other applications.
||July 2000 - Dec. 2001
Operating System Experience
All versions of Solaris through 10, FreeBSD 10-11, OpenBSD, macOS, various Linux distributions, mainly Debian, Fedora Core, CentOS.
Scripting, Programming and other Experience
Extensive scripting in sh, ksh, and bash. Usually switch to Perl when the
work requires more than bash. Remedial Ruby, Python, and C. Long ago,
regularly scripted in C-shell, Tcl, TK, and Expect.
Platform In-depth experience securing Unix machines directly
connected to the Internet, or behind firewalls. TCP-IP configuration and
Operation and configuration of the following:
Ansible, Puppet, Solaris Jumpstart, X11R4, 5 & 6, Apache (HTTP and
HTTPS), nginx, sendmail, Postfix, DNS, BIND, NIS, Kerberos, ZFS, ADSM,
LDAP, Netatalk, IMAP, POP, OpenSSL, OpenSSH, Legato Networker, rsync, PAM,
PPP, NFS, AMD and other automounters, GNU utilities, Majordomo, Mailman
and many other free software packages. Extensive Sun hardware experience.
Completed 137 credit hours at the University of Texas, double-majored
in English and History.
Certification in various Sun System administration classes, including
the E10000. Completed NetScaler administration class. Attended numerous
USENIX, SANS, and other conferences.
References Available Upon Request