Hi, thanks for stopping by!
My name is
I started playing with technology at an early age, and gladly my parents always supported this hobby of mine. I really appreciate how many doors it opened for me since then.
If I am not busy on my keyboard, I like to hang out with my friends, travel and spend quality time with my
I am very proud and happy to be a co-founder of nebenan.de, where I had 5 years the privilege to work with an awesome team to bring neighbors a bit closer together.
Currently I am working as co-founder of the gut.org invest GmbH with an equally awesome team to make impact investing easier. bcause.com
Below is more information on the
services I offer (currently not available!) and the projects I have been doing.
If you have any questions or just want to talk about tech-stuff, please do not hesitate to contact me.
I had my first job as a programmer in 1998 building perl based websites. Since then I have worked on many applications, ranging from simple content management systems over community software to ERP systems and business process automation. I also enjoy to work on mobile phones or writing software for your startup.
Working for and with multiple internet service providers I had the opportunity to build and migrate WiMAX networks, write and deploy various services and play with expensive hardware. With a preference for open source software I help companies to customize available solutions to their needs and make existing components work together.
I also offer security consulting with focus on web applications and general information security. I have discovered security problems in web applications, kernel modules, as well as in consumer software like ebook readers or video players. I also reverse engineered firmware to break authentication methods and hunted for backdoors.
On the defending side I've build and integrated firewalls, IDS or NACs like packetfence.
But I've also worked with java, objective c, x86 asm or scripting languages like php, python, basic dialects or query languages.
Yes, I do automated testing; I use version control and I love CI.
Linux preferred. Accidental knowledge about Windows, BSD and Mac. I also picked up some cisco skills along the way.
Postgresql, MySQL/MariaDB, IBM-DB2
Apache, Lighttpd, nginx, HaProxy
Postfix, Exim, Courier
Freeradius, Radiator, Samba, Squid, cvs, svn, git, dhcpd, nfs, pppoe, asterisk, openfire, rrdtool, zabbix, snort, packetfence...
Many proprietary NMS systems like snmpc, other monitoring solutions, firewalls, more or less everything you would find inside an ancient or modern ISP.
Experience with smart card programming.
Radio systems from multiple vendors like Alvarion/Telrad, Airspan, Ceragon. WiMAX, Microwave, VSAT installations. And some mobile devices.
phone: +49 22 47 90 80 250
mobile/signal: +49 157 3131 4424
GPG/PGP-Key: (pub 4096R/069DD13C 2014-02-13) local copy pgp.mit.edu
GPG/PGP-Key: fingerprint: 9BAD 94D3 9176 5BD1 F64F 542E 37E4 3542 069D D13C
No tracking at all. Logs are anonymized.