• As Contractor 02.2012-02.2014
• As FTE at Citrix Systems International, Schaffhausen, Switzerland since 03.2014

• Application Owner and Operations for G2AC since 02.2012
• Application Owner and Operations for G2AC, G2A-RS, Launcher- Service, Calendar-Integration, Netviewer

• Link between product development in Germany and Operations in USA
• Responsible for uptime of the product
• Major role in trouble shooting and debugging on all levels (code, network, OS, overall design, …)
• Design and implementation of operation related product components
• Ensuring release deployments
• Maintain close communication with all product teams
• On-Call

Site Lead Operations Karlsruhe since 03.2014

• Team lead of an operations team with up to 4 members
• Assignment of responsibilities
• Coordination of work load

• VoIP connections between D and CH: Protocol IAX2
• IAX over VPN
• QoS via tcng

• Installation and Setup of Debian/Unitix systems
• Installation automation using Puppet
• Programming of installation scripts
• Analysis of errors and problems

Quality-Assurance in project “Adition”

• Ensuring functional and non-functional requirements
• Performance measurement using Silk-Performer
• Analysis of errors and problems

Requirement analysis / conception 

• Installation and configuration

Conception of a new computer center

• Network conception based on OSI layers 1 to 4
  Network: Cisco Switches/Router, Firewalls, Spanning Tree Protocol

Consulting in Performance Care Team

• Analysis of network: OSI layers 1 to 5:
• Setup of a sniffing infrastructure
• Analysis of network communication
• QoS analysis
• Traffic shaping
• Providing a solution concept

TSP7000 (about 30-100 staff members):

• TSP7000 (Telecommunication Service Platform) is a high availability system for services in mobile communications. 
• An important feature of this platform is an uninterrupting and risk minimized

• update feature:
  • Collaboration for RSU (Rolling Software Update)
  • SUF (Software Update Framework) and SMU (Split Mode Upgrade) and providing support for the
    whole TSP7000 project were my main tasks

• Error analysis and correction in RSU and close-to-RSU code
• Check tool for critical database corruptions related to updates (RtpUpdExtChk)
• Redesign of update concept: development of SUF:
• Concept and design of SUF in a team of three coworkers
• Implementation of SUF in a team of four coworkers
• Conception, design and implementation of parts of SUF and close-to- SUF code
• Automated first update whilst first installation (FIRSU)
• Automated installation of SUF software onto the systems (SufInstaller)
• Checking tool for to be installed units (SufUnitChecker)

Modification of basic configuration tool "configureRTP":

• Before: Configuration was interactively queried on stdin.
• Conception and design of a configuration interface in XML
• Implementation
• Error analysis and correction in SUF and close-to-SUF code
• Error analysis and correction in SMU and close-to-SMU code
• Error analysis in the whole TSP code and solution provisioning for unclear and/or urgent problems
• Performance optimization of update procedures: Fulfilling given maximum durations
• Coaching in IPv4 and IPv6 networking
• Elaboration of a manual fallback procedure for RSU