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<h3>
Resume
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<div itemscope itemtype="http://schema.org/Person">
<p>
I am <span class="b" itemprop="name">Gergely Polonkai</span> (sometimes referred
to as <span itemprop="nickname">W00d5t0ck</span> or <span
itemprop="nickname">Polesz</span>), a <span class="b" itemprop="jobTitle">software
developer, systems engineer and administrator</span>. I was born on <span
class="b" itemprop="birthDate">7 March, 1983</span> in Budapest, Hungary. I spent
my life moving here-and-there in the country, and finally settled in <span
class="b" itemprop="address" itemscope itemtype="http://schema.org/Address"> <span
itemprop="locality">Veresegyház</span></span>.
</p>
<p>
You can reach me on <span class="b" itemprop="email">gergely@polonkai.eu</span>,
or by phone on <span class="b" itemprop="telephone">+36 (30) 7375-706</span>. I
fluently speak and write <span class="b">English</span> and <span
class="b">Hungarian</span> and currently learning Icelandic.
</p>
<p>
I have <span class="b">graduated in 2001</span> from <span class="i">Táncsics
Mihály Szakközépiskola, Szakiskola és Kollégium</span>, an architecture high
school based in Veszprém, Hungary. There, I learned about <span
class="b">electricity and elevators</span>, while getting my feet wet in the area
of IT systems engineering. Together with some teachers, we developed <span
class="b keyword" title="network building">the IT infrastructure of the school,
building it from scratch</span> with <span class="b keyword">Windows XP</span>
based clients, and <span class="b keyword">Debian GNU/Linux</span> servers with
<span class="b keyword">Squid proxy</span>, an <span class="b keyword">Apache
httpd</span> web server, <span class="b keyword">Exim</span>+<span class="b
keyword">Courier IMAP</span> based internal mailing and a <span class="b
keyword">Samba file server</span>. Meanwhile, I have created the school’s first
<span class="b keyword" title="web development">web page</span> using <span
class="b keyword">Perl CGI</span>, and later it’s replacement in <span class="b
keyword">PHP</span>. Although I did that as a student, I consider it my first
job.
</p>
<p>
My first contract was made in <span class="b">2002</span> with a small Budapest
based ISP that served Internet connection to a large warren. I have mastered Linux
based <span class="b keyword" title="firewalls">firewalling and routing</span>
there using <span class="b keyword noupper">iptables</span>, and <span class="b
keyword" title="QoS">tc for QoS</span>. I have also created a <span class="b">web
page</span> for the company using <span class="b keyword">PHP</span> and <span
class="b keyword" title="MySQL database development">MySQL</span>.
</p>
<p>
After that I contracted with a small <span class="b">web development
company</span> in <span class="b">2004</span>. Here I was in the role of both a
<span class="b keyword" title="web development">web developer</span> and a <span
class="b keyword" title="Systems administration">systems administrator</span>. I
have mastered <span class="b keyword">PHP</span> there, together with <span
class="b keyword">MySQL administration</span>. I also built a small <span class="b
keyword" title="routers">router</span>/<span class="b keyword"
title="firewalls">firewall</span> out of a PC for office needs.
</p>
<p>
My next job came in <span class="b">2006</span>, when I contracted with a small
<span class="b">VoIP company</span> developing a call center software based on
<span class="b keyword">Asterisk</span>. My job here was to create a base system
for this software as small as possible, while managing the old, Ubuntu based
ones. For the new version we targeted <span class="b keyword">Gentoo Linux</span>
because of its possible small size, and performance reasons.
</p>
<p>
The job that followed was with a world-wide IT services company in <span
class="b">2007</span>, where I became a member of a large team supporting and
administering several thousand servers, mostly based on <span class="b
keyword">Red Hat Enterprise Linux</span> and <span class="b keyword">SUSE Linux
Enterprise Server</span>. There I mastered cluster technologies (both <span
class="b keyword">Heartbeat 2</span> and <span class="b keyword">Red Hat
Cluster</span>), <span class="b keyword">SAN</span>, <span class="b keyword
noupper">iSCSI</span> and <span class="b keyword">NFS</span> based storages, <span
class="b keyword">Apache httpd</span> and <span class="b keyword">Tomcat</span>
web servers, administration of <span class="b keyword" title="MySQL
administration">MySQL</span> and <span class="b keyword" title="Oracle 10g
Database Administration">Oracle 10g Database</span>s, <span class="b
keyword">Bacula</span> based backup, <span class="b keyword">Windows 2003
Server</span> and <span class="b keyword">Windows Server 2008</span> (both
standalone and cluster) with <span class="b keyword">Active Directory</span>,
<span class="b keyword">Group Policy</span>, <span class="b keyword">Microsoft
Exchange Server 2005</span> and <span class="b keyword">Microsoft SQL Server
2005</span>, <span class="b keyword">Xen Open Source</span> virtualization, <span
class="b keyword">Citrix XenServer</span> and <span class="b keyword"
title="Citrix XenApp">XenApp</span>, <span class="b keyword">VMware ESXi</span>
and <span class="b keyword" title="VMware vSphere">vSphere</span>, <span class="b
keyword">Nagios</span> monitoring (and <span class="b keyword">monitoring</span>
in general), and last, but not least, <span class="b keyword">Linux
hardening</span> (<span class="b keyword">SELinux</span>, firewalls of different
kinds, fighting <span class="b keyword">application security</span> issues).
</p>
<p>
All this knowledge came in very handy, when I went to a leading Hungarian
financial company in <span class="b">2010</span>. The IT infrastructure was in a
very bad shape there, and my job was to rebuild the Linux parts from scratch. We
utilized <span class="b keyword">Debian GNU/Linux</span> servers (both standalone
and <span class="b keyword">Heartbeat 2</span> clusters), <span class="b
keyword">Apache httpd</span> web servers, <span class="b
keyword">Exim</span>+<span class="b keyword">Courier IMAP</span> for mailing,
<span class="b keyword">Bacula</span> based backup, <span class="b keyword"
title="MySQL administration">MySQL</span> and <span class="b keyword"
title="PostgreSQL administration">PostgreSQL</span> database servers, <span
class="b">Oracle Database</span>s (both <span class="keyword" title="Oracle 10g
Database Administration">10g</span> and <span class="keyword" title="Oracle 11g
Database Administration">11g</span>), <span class="b">Microsoft SQL Server</span>s
(both <span class="keyword" title="Microsoft SQL Server 2005">2005</span> and
<span class="keyword" title="Microsoft SQL Server 2008">2008</span>), <span
class="b keyword">Windows 2003 Server</span> and <span class="b keyword">Windows
Server 2008</span> (both standalone and clusters), <span class="b keyword">Active
Directory</span>, <span class="b keyword">Group Policy</span>, centralised <span
class="b keyword">ESET NOD32 anti-virus</span>, <span class="b keyword">Windows
cluster</span> based <span class="b keyword" title="Microsoft File Server">file
server with AD backend</span>, <span class="b keyword">WSUS</span>, <span class="b
keyword">OTRS::ITSM</span> helpdesk, <span class="b keyword">Zabbix</span> based
monitoring, virtualization with <span class="b keyword">Citrix XenServer</span>,
IT security solutions with <span class="b keyword">SonicWall</span> appliances,
<span class="b keyword">SELinux</span>, <span class="b keyword">Snort</span> and
<span class="b keyword noupper">iptables</span>, <span class="b
keyword">Perl</span> for system administration scripts, and <span class="b
keyword">PHP</span> and the <span class="b keyword">Symfony 2</span> framework for
internal web development. Although much has changed in this list since then, it
was my best and most challenging experience so far.
</p>
<p>
I left that company in <span class="b">2013</span> to work as a <span
class="b">freelancer developer</span> and a <span class="b">systems
engineer</span> for a <span class="b">startup network monitoring
company</span>. Here we were building a help desk system using open source
products like <span class="b keyword">OTRS::ITSM</span>, <span class="b
keyword">OpenLDAP</span>, and <span class="b keyword">Zabbix</span>. I also dug my
nose into <span class="b keyword">Docsis</span> based ISP networks and <span
class="b keyword">SIP</span>-based telephony.
</p>
<p>
Unfortunately our main employer went bankrupt in <span class="b">2014</span>, so
after a few months of freelancing I got a new job at the R&D division of a
leading telecommunications company. My current role is pretty close to
DevOps. Nowadays I’m developing a <span class="b keyword">Django</span>-based
internal web application, while maintaining internal scripts written in both <span
class="b keyword">Perl</span>, <span class="b keyword">Python</span>, <span
class="b keyword">bash</span> and <span class="b keyword">tcsh</span> or trying to
migrate the internal source code repositories from <span class="b
keyword">ClearCase</span> to <span class="b keyword">Git</span>.
</p>
<p>
I left that company in 2016, as such a slow moving giant couldn’t really keep up
with my pace. I signed with another startup creating games capable of analysing
work behaviour. Here we mainly use <span class="b keyword">Flask</span>, <span
class="b keyword">Cassandra</span>, and <span class="b keyword">Tensorflow</span>.
Unlike the previous one, this is a true learning organization, and given its size,
it is capable of taking quick turns if market changes (and that’s exactly what I
need).
</p>
<p>
In my <span class="b">free time</span>, I wander in forests, take pictures, and
sometimes manipulate them with the <span class="b keyword">GIMP</span>. Sometimes
I <span class="b">write</span> short fantasy or sci-fi novels using <span class="b
keyword">LibreOffice</span>. I am also developing some software in <span class="b
keyword">C</span>, <span class="b keyword">Python</span>, and <span class="b
keyword">Vala</span>, whose source code is managed with <span class="b
keyword">Git</span>. When I’m not in the mood for writing, I go and check out the
news on several technical areas, mostly IT and engineering, or give a try to a new
programming language in the name of “why not?”.
</p>
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