Stefan (R.) K.

Infrastructure Architect

Frankfurt am Main, Germany

Experience

Sep 2006 - Jan 2007
5 months
Munich, Germany

Senior Network Consultant

Telefonica

  • Reporting to management and major customer support

  • Communication with major customers

  • Overall planning and monitoring of the rollout

  • Initiating corrections in the Lotus Notes database

  • Monitoring the Lotus Notes database underlying the DSL rollout

Technologies: ADSL2+, TCP/IP, fiber optics, PG2, DSLAM Tools: MS Office, Project, Lotus Notes Vendors: Huawei, Microsoft, Telekom

Aug 2006 - Dec 2006
5 months
Stuttgart, Germany

Senior Network Consultant

Cellent AG

  • Planning the network redesign

  • Network analysis

  • Network redesign

Tools: MS Office, Visio, Adobe Acrobat Vendors: Cisco, Linux, Microsoft, Fluke, Network Instruments

Nov 2005 - Dec 2005
2 months
Dortmund, Germany

Senior Network Consultant

O2

  • Planning the connection of UMTS base stations via microwave links

  • Planning the management connectivity of microwave links

  • Identifying available data streams

Technologies: ATM, UMTS Tools: MS Office, x:acta, Mapinfo Vendors: Siemens, Ericsson, Actavara

Jun 2005 - Aug 2005
3 months
Frankfurt, Germany

Senior Network Consultant

Standard Life

  • Network analysis in a highly sensitive environment (personal data)
  • Correcting network errors
  • Installation of ISA servers

Technologies: Windows 2003, XP, 2000, Linux, TCP/IP, routing, firewall, Ethernet, sniffer, SNMP, Nagios, CDP, DNS, DHCP, WINS, HTTP, HTTPS, SSL, FTP, Squid, proxy, Microsoft ISA, VMWare, load balancer Tools: MS Office, Visio, Adobe Acrobat Vendors: Microsoft, Cisco, Enterasys, Fluke, VMWare, Suse, RedHat, Alteon

Jan 2004 - Dec 2005
2 years
Frankfurt, Germany

Senior Network Consultant

RKW

  • Planning and implementing internet connectivity for notebooks and defining required security
  • Configuring VPN connections
  • Setting up Linux servers
  • Samba with authentication via OpenLDAP2

Technologies: firewall, security, TCP/IP, sniffer, SNMP, Nagios, switches, Ethernet, SAN, NAS, DAS, routing, DNS, LDAP Vendors: Watchguard, Cisco, HP, Zyxel, Network Instruments, Novell/Suse, Samba

Dec 2003 - Dec 2006
3 years 1 month
Frankfurt, Germany

Senior Network Consultant

Evangelischer Regionalverband

  • Planning the microwave link

  • Building a microwave link with 802.11g from a church tower

  • Network redesign and troubleshooting

Technologies: WLAN 802.11g, microwave antennas, sniffer, SNMP, TCP/IP, IPX, Netware, Ethernet, routing, VLAN, CDP Vendors: D-Link, 3Com, Cisco, Netgear, Novell, Microsoft

Feb 2003 - Mar 2003
2 months
Frankfurt, Germany

Senior Network Consultant

DG Bank

  • Second-level support for migration from OS/2 to Windows

Technologies: OS/2 and Windows domains, ADS Vendors: IBM, Microsoft

Feb 2003 - Feb 2003
1 month
Wiesbaden, Germany

Senior Network Consultant

Bank Aareal

  • Planning required network adjustments

  • Network analysis of a mixed Ethernet and FDDI network

Technologies: Ethernet, FDDI, sniffer, TCP/IP, routing, switches Vendors: Alcatel, Cisco, Microsoft, Fluke, Network Instruments

Nov 2002 - Feb 2003
4 months
Castrop-Rauxel, Germany

Senior Network Consultant

Rütgers Chemicals

  • Software distribution using ZEN
  • Client definition under XP/NT with images and unattended installation

Technologies: NDS, ADS, ZEN, unattended installation, Netware, Windows 2003, NAS, DAS Vendors: Microsoft, Novell

Feb 2002 - Sep 2002
8 months
Frankfurt, Germany

Senior Network Consultant

DQS

  • Planning network modifications and expansions

  • Network analyses, support, and planning

  • Installation of network components

  • Security support

Technologies: TCP/IP, cluster, routing, firewall, Ethernet, sniffer, SNMP, Nagios, HP Openview, Token-Ring, ISDN, Netware, SAN, NAS, DAS, DNS, DHCP, WINS, PPPoE, 3270, TN3270, 5250, TN5250, SNA, Microsoft SNA Tools: Visio, Adobe Acrobat Vendors: Cisco, Novell, Linux, Microsoft, Fluke, Network Instruments

Nov 2000 - Aug 2001
10 months
Frankfurt, Germany

Senior Network Consultant

atlantic telecom

  • Establishing the network and resource planning department

  • Introducing network and resource planning and change management for LANs and WANs including ATM backbone

  • Coordinating and planning ISP connections

  • Managing, validating, and consolidating data for S(H)DSL connections of ISPs to ATM WAN

  • Planning ATM and TCP/IP definitions with WAN routing

  • Coordinating staff for change management implementation

  • Planning and coordinating NOC and field technicians for changes

  • Defining network parameters such as ATM, QoS, TCP/IP, and routing

  • Coordinating ISPs for backbone connection

  • Planning and coordinating device testing

  • Second- and third-level NOC support

  • Integrating ATM switches into the live network

  • Resolving critical errors in the ATM backbone and S(H)DSL connections

  • Testing and configuring Nokia DSLAMs

  • Testing and configuring provisioning of ATM and DSL components (DSLAMs, DSL routers)

  • Testing and configuring SHD/PDH and ATM equipment (Fore/Marconi, Nokia), loopmaster testers, Redback routers

Technologies: TCP/IP, routing, ATM, SDH, PDH, WAN, DSLAMs, SDSL, SHDSL, security, Ethernet, sniffer, SNMP, HP Openview, firewall, PPPoA Tools: Visio Vendors: Cisco, RedBack, Fore/Marconi, Nokia, Microsoft, Fluke, Network Instruments, Trend, Cabletron/Enterasys

Aug 1997 - Mar 2000
2 years 8 months
Trebur, Germany

Senior Network Consultant

Rechenzentrum Trebur / Mitsubishi

  • Planning server migration from Netware 3 to Netware 4

  • Planning NDS structure, backup strategy

  • Planning migration from DOS and OS/2 to Windows NT 4.0

  • Planning notebook implementation under Windows

  • Coordinating internal and external staff

  • Coordinating department reorganizations for filesystems and servers

  • Supporting management in strategic decisions on IT equipment, storage systems, WAN connections

  • IST, vulnerability, and data flow analysis of Token-Ring network

  • Server migration Netware 3 to 4

  • Implementing NDS structure and backup strategy

  • Notebook implementation under Windows

  • Client definition under NT/2000 with images and unattended installation

Technologies: Ethernet, Token-Ring, Frame Relay, ISDN, TCP/IP, IPX, routers, network security, firewall, Windows NT, Windows 2000, Netware 3, Netware 4, unattended installation, sniffer, SNMP, Nagios, DNS, DHCP, WINS, 3270, TN3270, 5250, TN5250, SNA, SAN, NAS, DAS, Microsoft SNA, NDS, Bindery Tools: Visio, Adobe Acrobat Vendors: Cisco, Madge, Microsoft, IBM, Novell, Fluke, Network Instruments, Trend, Cabletron/Enterasys

Jan 1997 - Dec 1999
3 years
Frankfurt, Germany

Senior Network Consultant

Fina Deutschland

  • Coordinating external firms for issue resolution

  • Coordinating credit card transaction firms

  • Optimizing credit card transactions

  • Administering Oracle database and SCO Unix

  • Setting up and coordinating WAN connections

Technologies: dial-up, Datex-P, ISDN, satellite data transmission, SCO Unix, SQL database, mailbox Vendors: SCO, Oracle

Jan 1994 - Oct 1998
4 years 10 months
Bensheim, Germany

Senior Network Consultant

Escom / Proline / Schadt Business GmbH

  • Planning network modifications and expansions

  • Initial client contacts for individual network analyses

  • Reference PC implementations

  • Support for mail-order companies and banks

Technologies: Ethernet, Token-Ring, ISDN, TCP/IP, IPX, NDS, routers, firewall, Windows, Novell, OS/2, SAN, NAS, DAS, 3270, TN3270, 5250, TN5250, SNA, Microsoft SNA, DNS, DHCP, WINS, unattended installation Vendors: Cisco, Microsoft, Novell, IBM, Fluke, Network Instruments, Trend, Cabletron/Enterasys

Jan 1992 - Dec 1996
5 years

Senior Network Consultant

Fina Deutschland

  • Planning and leading network build-out

  • Planning client migration from DOS and OS/2 to Windows

  • Defining notebooks under Windows

  • Coordinating internal and external staff

  • Setting up and coordinating WAN connections

  • Building Token-Ring PC network

  • Connecting PCs to mainframes (SNA, TCP/IP, 3270 terminal emulation, TSO file transfer)

  • Implementing and migrating Novell servers

  • Migrating clients from DOS and OS/2 to Windows

  • Implementing notebooks under Windows

  • Troubleshooting and managing Token-Ring network and clients

Technologies: Ethernet, Token-Ring, Frame Relay, ISDN, TCP/IP, IPX, SNA, sniffer, SNMP, switching, routing, firewall, Windows NT, Novell, OS/2, NAS, DAS, WAN, unattended installation, notebooks, TSO, AS/400, mainframe, 3270, TN3270, 5250, TN5250, SNA, Microsoft SNA, DNS, DHCP, WINS Vendors: Cisco, Madge, Microsoft, Novell, IBM, Fluke, Network Instruments

Summary

Dear Sir or Madam, nowadays IT infrastructure is one of the foundations for a company's success. Without a doubt, design, security, availability and operation of a suitable client/server infrastructure are becoming increasingly important.

In this context, it's no longer enough to split a network into individual areas such as servers, clients, VoIP, DMZ, data centers, VPN, MPLS, LAN or WAN, or to view, plan or manage them separately.

To gain added value from a network for a company and to ensure network security over the long term, it's necessary to look at the logical connections of applications such as SAP or file services from the server to the client. This has to be done with consideration for security, standardization and performance across all active and passive components such as servers, clients, switches, routers and firewalls, as well as the underlying network topologies in LAN and WAN. Virtualization, the introduction of new technologies like SDN and the outsourcing of services and infrastructure play a special role here.

My specializations:

  • Infrastructure architecture, planning and design
  • Infrastructure security
  • Reviewing and planning security concepts
  • Technical project planning and management
  • Technical partner management, vendor coordination
  • Change and incident management, BCM
  • Network analysis
  • Migration of WAN and LAN structures such as MPLS, VPN, switched or routed networks in live operation
  • Aligning technical requirements between business units and IT

Despite that, I have successfully completed projects in areas that build on or overlap with these topics.

Over time, I have developed from a technical role into management without losing sight of the technical aspects, to offer my clients the right added value as the last level of escalation.

For further information, such as the measurement and analysis tools available to me or past projects, I will be happy to answer any questions.

I look forward to supporting you and/or your clients with your everyday and not-so-everyday challenges!

Languages

German
Native
English
Intermediate

Certifications & licenses

Certified Iso/Iec 27001 Lead Implementer

PECB

CISM

ISACA

BSI IT Baseline Protection Practitioner

BSI

CEH

EC-Council

CISSP

ISC2

Itil V3 Foundation

ITIL

KBV Certified According to § 390 SGB V

KBV

Prince2 Foundation

APMG

Prince2 Practitioner

Togaf9

The Open Group

VdS Recognized Consultant for Cyber Security (VdS 10000)

VDS

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