Experience

• 

  Nexphone AG

  • Winterthur, Switzerland

  • Information Technology System/Security Consultant

    • May 2020 - Present
    • Winterthur, Switzerland

    Experienced IT Network Engineer with expertise in infrastructure planning, administration, and troubleshooting. Skilled in identifying and resolving network vulnerabilities, implementing security measures, and developing Python applications for telecommunication infrastructure. Proficient in managing and maintaining firewalls, conducting network scans, and performing root cause analysis for security incidents. Well-versed in Linux, FreeBSD, and Windows operating systems, as well as various network protocols and applications such as Voip, SIP, RTP, MySQL, and Apache.

• 

  green.ch AG

  • Switzerland

  • IT Consultant

    • May 2001 - Apr 2020
    • Switzerland

    Head of IT Platform Datacenter at Green.ch AG, responsible for building, securing and operating newly developed cluster environment (approx. 60 VMs). Led Engineering/Development Team, Server Operation Team (7 employees) and Network Operations Team (8 employees). Responsible for operating Microsoft Azure Stack Cloud, Linux Onapp Cloud and diverse hosting servers (approx. 500 servers) while ensuring compliance with SLAs. Integral Security Officer (ISB) responsible for ISO 27001 compliance and re-certification. Led planning and uninterrupted introduction of fault-tolerant network and server infrastructure (Bigip F5 Loadbalancer). Conducted technical due-diligence audit of several firms. Planned, built and operated UNIX/Linux hosting infrastructure, Opesstack environment with CEPH Storage Cluster, Hosted Exchange environment with MS-MPF, and Exchange 2010 with 20 servers. Provided troubleshooting and 3rd level support for operating systems (Linux, BSD, and Windows 2008/2012), network (TCP/IP, security, routing, snmp, dns, http/https, load balancing) and applications (mysql, apache, dns, ftp, resolver, Exchange 2010). Developed programs in PHP, Perl, C/C++, VB and Mapi. Coordinated and executed migration of several thousand acquired hosting customers (customer base, websites, databases, and mailboxes). Conducted technical review and implemented complete cooling system concept for new datacenter.