Ralf Holtorf

Took a planned career break to focus on personal goals and development before resuming my professional journey with fresh perspectives and energy.

Operational responsibility (Build and Run) for global corporate datacenter network: DNS/GSLB, VPN, Loadbalancing, Firewalls, Proxy, Routing • 24/7 on-call 2nd level support for datacenter network • End to end handling of complex network incidents • Migration / integration of networks • Ops lead for various global projects (network integration after merger, DC migrations, new FW strategy etc)

one of the two sole responsible individuals for all Opel / Vauxhall Enterprise Firewalls • Enterprise Remote Access for Employees and Partners (Cisco AnyConnect / Cisco ISE) • Security design and build for Business Continuity Datacenter network + DC migration • Resp. for change management process • full responsibility for o IDS/IPS (Cisco Firepower) o Remote Access VPN (Cisco ASA / AnyConnect / ISE) o Site-To-Site VPN (Cisco ASA) o Proxy (Cisco WSA) o Load Balancer (F5 LTM/GTM)

Network Design & Engineering for ~150 global GM Enterprise Firewalls • Responsible for ~50 Branch and Partner Site-To-Site VPNs • Lead Engineer on major IT projects, collaborating closely with various IT and business teams: redesigns, datacenter migrations, IPS / FW rollouts etc • Responsible for Firewall L2 / L3 Troubleshooting • Subject Matter Expert for Cisco Security Manager • Responsible for tools and strategies for automation of repetitive processes

• DHCP, DNS and IP Management Services for a variety of customers • IPv6 transition / addressing management

• Firewall Engineer for Big Customer's Global Network • Design & Engineering for ~150 Customer Firewalls, with focus on EMEA Region • Subject Matter Expert for EMEA Webhosting Environment • Subject Matter Expert / User Trainer for internal Request Tools • Plan / Develop advanced Scripts for Automation of repetitive processes • Mentor for Offshore colleagues and business students

• Firewall Engineer for Big Customer's Global Network • Design & Engineering for ~150 Firewalls, with focus on EMEA Region • Subject Matter Expert for EMEA Webhosting Environment • Subject Matter Expert for Internal Request Tool • Plan / Develop advanced Scripts for Automation of repetitive processes

• Responsible for managing, maintaining, and customizing of network documentation (NFM C6000) and Visualisation (NetViz) tools • In-house trainer for NFM C6000 and NetViz • Administration of 30 servers on OS and application level (Solaris, Linux etc.)

• Enterprise Network Management (9 months) • Web Application Development (3 months) • Engineering Call Center (3 months) • Client/Server Systems Management (3 months)