Charles (O) J.
Senior Network Engineer
Experience
Aug 2024 - Nov 2024
4 monthsStuttgart, Germany
HybridNetwork Architect
RedGlobal GmbH via LTIMindtree, client Exyte GmbH
- Configuration of Dell switches, routers, and access points
- Troubleshooting and resolving issues
- Environment: Extreme, Cisco, and Dell switches and routers; onboarding of Extreme WLAN access points to Extreme A3 NAC and Extreme CloudIQ
Aug 2023 - Aug 2023
1 monthHamburg, Germany
On-siteNetwork Architect
Nemensis AG, client ITZBund Hamburg
- Provisioning of Cisco 9200 switches
Jun 2021 - Sep 2022
1 year 4 monthsSenior Network Architect
Primus Global, client Daimler Benz AG
- Gathering information and transferring knowledge for Daimler Benz
- Documenting and taking over IT operations from the previous provider
- Consulting role and reviewing CISM requests from customers to ensure compliance with company policies
- Commissioning Fortinet and Palo Alto firewalls, analyzing incidents and creating rule sets
- Architecture design for F5 load balancers in two redundant data centers
- Environment: Azure Cloud, F5 load balancer, Squid proxy, DNS, hosting, VXLAN, Check Point firewall, Fortinet firewall, and MPLS WAN connections
- Responsible for the architecture of the current and future operating model in EMEA, Asia, and North American data centers
Oct 2019 - Oct 2020
1 year 1 monthSt. Gallen, Switzerland
Manager Networks – Projects
Cognizant AG, client Debrunner - Acifer
- Operating a nationwide network with over 300 Cisco switches
- Managing Cisco wireless controllers and 190 Cisco access points
- Analyzing and troubleshooting network issues, patching switches
- Experience with the ServiceNow ticketing tool
- 2nd-level user support
Apr 2018 - Mar 2019
1 yearHamburg, Germany
Freelance Network Architect
Nexperia GmbH on behalf of Gazellgc and TCS Germany
- Administering a network of 140 Cisco switches (Catalyst 2960s, Catalyst 6513, Nexus 9k)
- Configuring and troubleshooting IPAM, Cisco ASA Firepower, Cisco Catalyst and Nexus switches, dual Cisco wireless controllers, and 95 Cisco Aeronet access points
- Monitoring and troubleshooting the network, patching
- Using Cisco Prime and SOLIDSERVER IPAM
Sep 2017 - Mar 2018
7 monthsHamburg, Germany
Freelance Senior Network Engineer
QSC on behalf of Robert Half GmbH
- Rollout of 3800 switches in 1100 bank branches as part of a team
- Tools: HP Service Manager 9, iTOP, SMC, and Bluecat IPAM
Sep 2015 - Dec 2015
4 monthsHamburg, Germany
Network & Security Administrator
Questax GmbH – KION
- Administration of Juniper VPN gateways and PRTG
- Administration of Microsoft PKI, including creation and revocation of certificates
- Troubleshooting and resolving PKI, SSL, proxy, authentication, and network events using traceroute, ping, CA tools, and AD tools
- Working with Helpmatics and Landesk incident management tools
Jul 2014 - Dec 2014
6 monthsMunich, Germany
Network Architect
Reutax AG, end customer o2-Telefonica
- Analysis of network and security requirements to create firewall rule sets that meet corporate policies
- Development of network and performance solutions for data center migration purposes
- Creation and updating of network documentation for a data center migration project in a Europe-wide MPLS network
- Participation in daily and weekly project meetings and conference calls
- Troubleshooting with Wireshark, tcpdump, nslookup, dig, ping, and traceroute, and ticket handling with Remedy
Apr 2013 - Apr 2014
1 year 1 monthMunich, Germany
Network Specialist
NSCglobal GmbH, end customer Atos and Siemens AG
- Documentation of routers and switches (150,000 ports) and their VLANs and gateways in customer branches using Visio and Excel sheets
- Maintenance of the network inventory list
- Adjustment of distribution L3 and access switch configurations to comply with technical guidelines
- In-depth knowledge of dot1x, RADIUS, TACACS, QoS, VTP, and Spanning Tree on Cisco switches (Catalyst 2960, 3560, 3750, 4500, 6509)
- Network management with Spectrum, Cisco Network Compliance Manager, AdminGate, and SharePoint
Aug 2012 - Apr 2013
9 monthsCologne, Germany
Senior Network Architect
Avance Consulting Ltd, end customer Wipro Technologies GmbH
- Conducting compatibility tests on two Cisco 6513 and HP 5424 for an energy company in Hamburg
- Network design for a data center migration project and implementation of routing and switching to connect four data centers using BGP and OSPF
- Configuration of redundant Cisco 6513 with VSS and EtherChannel connections to HP switches and Cisco 4500 in a lab environment
- Configuration of Cisco Nexus 5596 in FabricPath and Cisco ACE 4710 in a redundant setup across two HA data centers
- Creation of high-level and low-level network design documents with Visio and MS Word
- Review and creation of the bill of materials (BOM)
- Management of four data centers
Jan 2010 - Jul 2012
2 years 7 monthsLagos, Nigeria
Network Consultant
Lorah Technologies Ltd
- LAN design for companies
- Implementation of WAN infrastructure for customers
- Configuration of routing protocols (OSPF, EIGRP) on Cisco routers
- Configuration of switching protocols on Cisco switches
- Setting up VPNs for customers using Cisco ASA 5500 firewalls
- Installation, configuration, and implementation of Windows 2008 R2 servers and VMware
- Phone-based customer support
Feb 2009 - Jul 2009
6 monthsPuchheim, Germany
Telecommunications Specialist
Amway GmbH
- Upgraded IOS software on 150 Cisco routers and 200 Cisco switches across 20 European branch offices
- Designed networks (LAN/WAN) and implemented IT infrastructure for a new branch in the UK
- Configured Cisco routers in a redundant setup: primary line with MPLS/BGP and secondary line with IPsec/VPN and BGP/EIGRP
- Configured STP, VLAN, Port-Channel, and QoS on Cisco switches (Catalyst 4000, 3560, 3750, 2960)
- Configured QoS, PBR, NAT, and access lists on WAN routers (7206-VXR, 7000, 4500, 3660, 3800, 2600, 1600, 1721, 1800, 2821)
- Managed 50 Riverbed 1050 Steelhead WAN optimization devices
- Supported three data centers and installed network components in racks
- Network management and monitoring with SolarWinds, Nimbus, and NetFlow
- Change management with Remedy, documentation with Visio and MS Office
- Data center administration
Jun 2007 - Feb 2009
1 year 9 monthsMunich, Germany
Senior Network Engineer
itk network GmbH, end customer o2-Telefonica
- Technical consulting for pre-sales and network departments
- Reviewing customer RFPs and developing technical WAN solutions, as well as approving the solutions
- Configuring routing protocols (BGP, OSPF, EIGRP, RIPv2), MPLS VRFs, and MP-BGP
- Designing MPLS/WAN solutions (hub-and-spoke and full-mesh) and documenting with Visio
- 3rd-level WAN support in a team of six colleagues
- Troubleshooting routing, IOS software, and router hardware issues
Sep 2006 - May 2007
9 monthsOberursel, Germany
IT Support Specialist
Nruns AG
- Configuring and managing file and print services, MS DHCP, DNS, GPO, RADIUS, IIS server services, and MS Exchange 2003 servers
- Installing and setting up Windows 2003/2000 servers
- Managing Active Directory domains
- Managing and creating security rules on Check Point NGX firewalls (R65) on Crossbeam appliances in cluster mode
- Creating OS and application software images with Acronis, installing and configuring Sophos antivirus, and backing up data to DLT tapes
- Managing the VoIP infrastructure (Cisco IP phones and Call Manager)
- Configuring Fedora Linux servers and IPCop proxy servers
- Configuring VTP and VLANs on Cisco 3750 switches
- Selecting and evaluating hardware components, technologies, and software products
- Negotiating with suppliers for IT purchases
- Managing the data center and lab
Jan 2006 - Aug 2006
8 monthsFriedrichsdorf, Germany
Data Center Network Administrator
Paragon Data GmbH
- Configuring and managing Cisco PIX/ASA firewalls and securing customer networks with security rules
- Connecting branch offices to the server farm in the provider network using IPsec
- Managing DHCP, RAS, and RADIUS services on Windows 2003 and 2000 Advanced Servers
- Configuring and migrating 350 customer routers to MPLS in cooperation with Deutsche Telekom
- Installing racks and cabling network components in the data center
- Configuring OSPF, ACLs, NAT, and IPsec on Cisco routers (6500, 2800, 3600, etc.)
- Configuring STP, VLANs, and Port-Channel on Cisco switches (6500, 4000, 3548-XL, 3750)
- Network monitoring with Intellipool and Nagios
- Managing the data center and overseeing a data center migration
Jun 2003 - Dec 2005
2 years 7 monthsLagos, Nigeria
Cisco Trainer
Nigertel
- Conducting seminars to prepare for the Cisco CCNA 2.0 exam
- Managing the lab
- Creating training programs
Apr 2001 - Mar 2003
2 yearsHamburg, Germany
Network Administrator
Heinrich Bauer KG
- Managing and monitoring 60 Cisco routers and 140 Cisco switches in 20 European branches and a data center with a team of four
- Configuring and supporting remote access on Cisco AS5300 access routers
- Configuring, upgrading, and commissioning Cisco Catalyst switches (5000, 4000, 2948, 3548) and Cisco routers (6513 with MSFC-II, 3640, 4000, 7000 with RSM, 7206-VXR, 2600, 1600)
- Configuring routing protocols (BGP, OSPF, EIGRP), HSRP for redundant gateways, ACLs, GRE for Appletalk encapsulation, NAT/NAPT, PPP, and MPPP on Cisco AS5300
- Cabling network components in the data center and equipment rooms
- Administering Checkpoint NG (Nokia) clusters, creating firewall rules, and reviewing logs
- Managing a data center
Jul 1999 - Mar 2001
1 year 9 monthsHamburg, Germany
System Administrator
Mondus.de GmbH
- Installing, configuring, and supporting Windows 98 and Windows 2000 clients, PC hardware, and printers
- Installing, configuring, and administering Windows NT 4.0 and Windows 2000 server domains
- Installing and maintaining MS Exchange 5.5, upgrading to MS Exchange 2000
- Installing antivirus software and MS Office 2000 on laptops
- Performing backups with Backup Exec
- Administering a Red Hat Linux VPN gateway
- Providing first-level support in the team
Oct 1988 - May 1997
8 years 8 monthsIbadan, Nigeria
Chemistry Teacher
C+K Remedial College
- Teaching chemistry
- Head of the chemistry department
- Purchasing lab supplies
Languages
English
NativeGerman
AdvancedEducation
Oct 1985 - Jun 1988
University of Lagos
Bachelor of Science Honours · Chemistry · Lagos, Nigeria · Second Class
Oct 1982 - Jun 1985
Tai Solarin University of Education
National Certificate of Education · Chemistry, Biology and Education · Ijebu Ode, Nigeria
Oct 1976 - Jun 1981
Ibadan Grammar School
General Certificate of Education Ordinary Level · Physics, Chemistry, Biology, Mathematics, English, Agricultural Science · Ibadan, Nigeria
Certifications & licenses
Microsoft Certified IT Professional (MCITP)
Cisco Certified Network Professional (CCNP 2.0)
Cisco Certified Network Associate (CCNA 2.0)
Microsoft Certified Systems Engineer (MCSE NT 4.0 Server)
Elekluft GmbH, Hamburg
System Engineer / Networks
Elekluft GmbH, Hamburg
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