Celal Celik
Senior Network Engineer @Rakuten
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WORK HISTORY
Senior Network Engineer @Rakuten
London, GB
Driving network design and operations on a global scale, with strong focus on Zscaler, SD-WAN, and enterprise security. Acting as designer for critical network projects and responsible for documentation and delivery of scalable and resilient infrastructures.• Designed and deployed Zscaler integrations to enable secure remote and cloud access.• Led SD-WAN design and operations, enhancing performance and reliability across global sites.• Implemented advanced security frameworks using Palo Alto firewalls, Panorama, and Cisco ISE.• Produced HLDs & LLDs for office and Data Center networks, including routing (OSPF, BGP) and VPN solutions.• Enhanced enterprise wireless environments with Cisco WLC and Juniper Mist platforms.• Designed and supported Azure networking services to enable hybrid cloud connectivity.• Introduced automation with Ansible and Shell to streamline operations and reduce costs.• Provided senior escalation support and mentored team members on complex technical challenges.• Delivered solutions across both green-field deployments and brown-field migrations, ensuring seamless integration with existing infrastructures.• Effectively communicated design decisions and project outcomes to both technical and non-technical stakeholders, aligning business and IT objectives
EDUCATION
Istanbul University
Bachelor of Engineering (BE), Electrical and Electronics Engineering
ABOUT CELAL CELIK
Distinguished Network Consultant with 14+ years of global experience across EMEA, APAC, and AMER. Specialized in SD-WAN and Zscaler, with strong expertise in Security, advanced Routing, and Data Center networking. Trusted advisor to leading enterprises, steering critical technical decisions and delivering complex projects with consistency and precision. Experienced in both green-field deployments and brown-field migrations, with proven ability to communicate complex network solutions to technical and non-technical stakeholders. Known for blending deep customer engagement, high-quality documentation, and hands-on mastery to design and deploy secure, scalable, and future-ready infrastructures.CERTIFICATES*CCIE Enterprise Infrastructure #50414 *Zscaler Digital Transformation Administrator - ZTDA*Microsoft Certified – Azure Administrator Associate*HPE Silver-Peak Networking SD-WAN Deployment Professional – ACSDP*HPE Silver-Peak Accredited SD-WAN Professional Assessment – AASP*HPE Silver-Peak Accredited SD-WAN Expert Assessment – AASX*Cisco Certified DevNet Specialist – Core*CCDE Written*CCNP Routing & Switching*CCNA Routing & Switching *CCNA Wireless*CCNA Security *Cisco Enterprise Networks Core and WAN*VCP6-NV VMware Certified Professional 6*VMware vSphere 6.5 Foundations*CCIE Routing & Switching Written*CCIE Data Center Written TECHNICAL SKILLSCORE NETWORKINGRouting & Switching | Data Center | Wireless | Virtualization | Service ProviderSECURITYPalo Alto Networks (Panorama)| Cisco ASA | Cisco FirePower | Checkpoint | Fortinet FortiGate | Cisco ISE, ACS, 802.1x, Tacacs+, Radius | Zscaler ZIA/ZPA (Zero Trust Network Access)| SASESD-WANCisco Viptela (vEdge, vBond, vManage, vSmart)| HPE SilverPeakVPN TECHNOLOGIESIPsec VPN | DMVPN | MPLS VPN | Site-to-Site VPN | SSL VPN (Cisco AnyConnect)| Remote Access VPNWIRELESS & SITE SURVEYCisco Wireless (WLC, AP, Prime, OEAP)| Juniper Mist Wi-Fi | Ekahau (Wi-Fi Site Survey & Planning)AUTOMATIONPython | Ansible | Shell Scripting | API IntegrationsCLOUDMicrosoft Azure NetworkingMONITORING & TOOLSPRTG | SolarWinds | LibreNMS | NetFlow | Kentik | Prometheus | GrafanaVENDORSCisco | HPE Silver-Peak | Zscaler | Juniper | Huawei | Arista | Meraki | Palo Alto | Checkpoint | Fortinet | VMware | MicrosoftPROTOCOLS & TECHNOLOGIESRouting (BGP, OSPF, IS-IS, EIGRP, MP-BGP)| MPLS (L3VPN, L2VPN, MPLS-TE, DMVPN)| Networking (IP, TCP/IP, IPv6, QoS)| LAN/WAN | Services| Telecommunication | Data Center (VXLAN, EVPN, VPC, VDC)| Multicast (Multicast, Anycast RP)
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