MK's home

CEO
NETitwork, Germany

2007 - current

• Highly specialized IT services company
• Focus on heterogenously compatible solutions, delivering world-class software on demand
• Open Source evangelist
• Solving your IT problems, without discussion.
• Geek to ask when something unexpected™ happens.

Vice President (VP) Technology & Architecture
Kopano, The Netherlands

2016 - 2021

• Designing & Defining protocols, standards and interoperability of Kopano product suite
• Product owner of Kopano Core, the foundation of Kopano products
• Lead of Kopano Core development team
• Chief technologist. Defining the technological path for Kopano products
• Chief architect. Pulling the strings together to deliver a seamless experience for a highly modular enterprise communication suite - Kopano.

Vice President (VP) Products & Architecture
Zarafa, The Netherlands

2013 - 2016

• As chief technologist lead the path for new products acompaning the existing product line, effictively designing the architecture of the future business model, called Kopano, enabling a vibrant marketplace and partner platform
• Design & architect next generation communication products based on industry standards such as WebRTC and WebDAV
• Technical lead of international and geographically split development teams
• Tripled amount of existing and released products within 2 years

Head of Professional Services DACH
Zarafa Deutschland, Germany

2012 - 2013

• Standardization of high availability product line
• Leader in design & implementation of scalable, fault tolerant implementations of Zarafa from local data centers to geographical cluster split over continents
• Responsible for very important customers, from governmental to automotive sector
• Speaker at many events, such as CeBit
• Filed patent for "System and method for sharing data storage devices"

Principal IT-Consultant & Linux Engineer
Millenux & Topalis AG, Germany
Testimonial

2008 - 2012

• Principal Consultant leading technological development of custom developed software
• Project lead for infrastructure projects at many customers, for example T-Systems, Maersk, Bosch & Continental Automotive
• Development of first stable USBoverIP (URB-to-IP encapsulation) in linux kernel
• Testing & enhancements of LIO iSCSI kernel target as successor to STGT in mainline kernel
• Mainstream and first production implementations of software-enabled write-through caches based on bcache
• Application development, such as complete-from-scratch development of the only alternative NX-compatible client (OpenNX)
• Enterprise migrations, such as multiple-overlap NIS-migrations to Active Directory with PBISE (PowerBroker Identity Services Enterprise), formerly Likewise Enterprise
• Package Management & Maintainership for many software projects, from Linux to Solaris
• Enhancements and contributions to 10+ open source projects
• Technical advisory to carrier-grade projects

Chief Executive Officer (CEO)
NETitwork Security Solutions, Germany

2007 - 2015

• Lead of small, strongly specialized consulting firm with customers in automotive and information technology sectors
• Specilized in data center services (PaaS, SaaS)
• Security auditing and security penetration tests
• Strongly customized development projects, ranging from custom linux OS development (kernel & user-space) to cross-platform application development

Chief Technology Officer (CTO) & Chief Development Officer (CDO)
CC GmbH, Germany & SSDI, CA/USA

2002 - 2008

• Design & implementation of first SRTP/SIPS implementation in asterisk VoIP PBX
• Lead of development with targeting systems, effectively on GPS and sensor callibration systems for laser based target marks
• Development of first multiple-uplink based routing for linux kernel (multi-route SNAT based on weighted algorithms)

Developer & Engineer
C-Soft GfSK, Germany

2000 - 2002

• Implementation of first web-based Microsoft Visio-to-JPG export tool based on server-side processing, exposed with ASP
• Enhancement of automated quality assurance & analytics systems at Siemens Healthcare & VDO

Security & Application Developer
Computer Century, Inc., NV/USA

1998 - 2000

• First firewall designs based on ipchains, later iptables
• Security auditing of multiple core infrastructure components (Mainframe)
• Design of connection-initiation-agnostic filesystem CCGFS

• 2018, FOSDEM
  Community & Business - Two worlds, one galaxy
• 2017, Kopano Conference
  Keynote Technology
• 2017, Kopano Conference
  Performance with KC
• 2017, Kopano Conference
  Guru session
• 2017, SLAC
  Z-Push & ActiveSync
• 2017, Chemnitzer Linuxtage
  Kopano - Von 0 auf 100 zur Groupware
• 2016, openSUSE Conference
  OBS and the real cool stuff
• 2016, Chemnitzer Linuxtage
  Behind the scenes: Zarafa & Outlook – geht es auch besser?
• 2016, CeBit Open Source Forum, Keynote
  Arbeiten und Kommunizieren im Office - 365 Tage im Jahr mit Open Source
• 2016, DataCenterDynamics @ CeBit
  How Zarafa uses open source technologies to deliver innovative services to enterprises
• 2015, Zarafa Tour
  Keynote Technology
• 2015, Linux-Stammtisch München
  Zarafa Architektur
• 2014, Zarafa Tour
  Keynote Technology
• 2014, Mailserver Konferenz
  Darum ist Zarafa die beste Groupware
• 2013, Chemnitzer Linuxtage
  Zarafa als Exchange-Ersatz in der (private|public) Cloud
• 2013, LinuxTag & Open IT Summit
  Zarafa als Exchange-Ersatz in der (private|public) Cloud
• 2010, openSUSE Conference
  X2go installation, configuration and best practices
• 2011, Zarafa SummerCamp
  Advanced Proxying with Zarafa
• 2010, Zarafa SummerCamp
  Install SUSE packages across 6.40.x and 7.x by one command

• Red Hat Certified Engineer (RHCE)
• NCLE (Novell Certified Linux Engineer)
• SUSE Certified Engineer (SCE)
• Zarafa Advanced Engineer
• Digium Certified Asterisk Professional (dCAP)
• Microsoft Certified Professional (MCP)
• Senior Level Linux Professional (LPIC-3), incl. 302 & 303
• Univention Certified Professional (UVCP)
• EC-Council Certified Ethical Hacker (CEHv5)
• EC-Council Certified Network Defense Architect
• VMware Certified Professional (VCP)
• Citrix Certified Administrator (CCA)
• IT Infrastructure Library (ITIL) v3 Foundation
• Zimbra Certified

Recognition

• 2011, Zarafa, Most contributing partner
• 2010, Zarafa, Partner of the Year
• 2004, SSDI, youngest C-level executive in company history (to date)

Google "Chrome" ohne Google? - Wie sich der Web-Browser "Iridium" durchsetzen will

DE

Bayerischer Rundfunk - B5 Aktuell

3/2016

US patent #20140250322 - System and method for sharing data storage

USA

US Patent Office

11/2013

Netzwerk-Dateisysteme im Geschwindigkeitstest

DE

Linux Magazin

02/2013

Filesystems Benchmarked

Worldwide

Linux Magazine

07/2012

NAS-Filer von vier bis 40 TByte im Vergleich

DE

Admin Magazin

03/2012

Anwenderbericht: Rechenzentrum auf Open-Source-Basis

DE

Millenux Corporate

06/2011

Sichere 9, PostgreSQL bringt Replikation und HA

DE

Linux Magazin

02/2011

Vorgelesen: Bücher über Nagios und VMware vSphere

DE

Linux Magazin

01/2011

Different Doorkeeper

Worldwide

Linux Magazine

11/2010

Virtualbox als Private Cloud

DE

Linux Magazin Technical Review

11/2010

Schrittmacherdienste

DE

Linux Magazin

11/2010

Zugriff nach Bedarf: Terminaldienst X2Go bekommt einen Webclient

DE

Linux Magazin

10/2010

Giraffenherde: Skalierbare Zarafa-Farm mit Round Robin DNS und HA

DE

Linux Magazin

09/2010

Besser abgesichert mit LinOTP

DE

Linux Magazin

02/2010

MySQL vs. PostgreSQL

DE

Linux Magazin Technical Review

12/2009

Netz und doppelter Boden

DE

Linux Magazin

09/2009

Operating Systems

• Microsoft Windows NT 4.0 - 10
• Microsoft Windows Server 2000 - 2019
• Red Hat Enterprise Linux (RHEL) ≥ 4
• SUSE Linux Enterprise Server ≥ 9
• Debian ≥ 4
• Ubuntu ≥ 8.04
• Gentoo ≥ 1.4
• openSUSE (formerly SUSE Linux) ≥ 5.2
• FreeBSD ≥ 4.0
• Unix (Solaris ≥ 8, AIX ≥ 4.3, HP-UX ≥ 10.20, Tru64 ≥ 5.0, MPE-IX)

Development Languages / Interpreter

• C, C++
• Python
• Go
• PHP
• Javascript
• Java

Architecuture / Methodologies

• Scrum
• Kanban
• Microservices
• Secure SDLC

Networking

• IPv4, IPv6
• IPSEC (incl. PKI based on x509)
• ipchains, iptables, nftables, ebtables, BSD pf
• tc (HTB, HSFC, CFQ)
• Wireless LAN (802.11a/b/g/n/ac), WMM, WPA/WPA2/WPA3
• Bonding
• WiMax
• OSPF, BGP
• Cisco PIX

Virtualization / Containers

• VMware ESX
• KVM
• Docker
• LXC / LXD
• Xen (incl. XenServer, XenDesktop)
• VirtualBox

Enterprise Services & Products

• Microsoft Active Directory
• Microsoft Exchange ≥ 2000
• Apache2, nginx, IIS
• Chrome Enterprise / Iridium Browser
• JBoss EAP
• ISC bind, Microsoft DNS Services
• ejabberd
• Squid, SquidGuard
• openLDAP, 389DS, Novell eDirectory, Apple Open Directory
• Postfix, Exim, Sendmail
• Mattermost, Rocket.Chat, Teams
• Amavis, Postgrey, ClamAV, Spamassassin
• Dovecot, Courier, Cyrus IMAP, Sieve
• HP/SIM
• Nagios, checkmk, Thruk, Icinga
• Zimbra
• Kopano
• Zarafa Enterprise
• Somura
• Asmanda

Security Products

• ESET Security Products, Endpoint / Server / Encryption
• EJBCA
• OPNsense, pfSense
• BackTrack, Kali
• Nessus
• Nexpose
• Metasploit

Cloud / Cloud Infrastructure

• Microsoft 365
• Open Telekom Cloud (OTC)
• Amazon Web Services (AWS)
• Azure

Databases

• MySQL, MariaDB ≥ 3.23
• PostgreSQL ≥ 8
• Oracle ≥ 9
• INGRES, OpenINGRES
• HP/DB (MPE-IX)

Backup

• Iperius Backup
• Veeam Backup
• Legato Networker
• Acronis TrueImage
• AMANDA, Mondo Backup
• SEP Sesam
• Percona XtraBackup
• dd, dd_rescue, rsync, robocopy

Terminal Services

• PCoIP
• SPICE
• Microsoft RDP
• Citrix ICA, HDX
• NoMachine NX3, NX4, NX5
• X2Go

Voice/Video over IP

• Asterisk
• VitalPBX
• Freeswitch
• SIP(S), (S)RTP
• openSER/Kamailio
• WebRTC

Version-Management

• Subversion
• git

• Extended security check by german government (§9 SÜG: Ü2)
• Hunting License
• Falconry License