Network Administrator (m/f/d)

## Job DescriptionWe are looking for a hands-on Senior Network Administrator to design, implement, and operate our enterprise network across multiple international sites. The ideal candidate brings deep expertise in next‑gen firewalls (Fortinet & Cisco Firepower), enterprise switching (Cisco & Juniper), and network automation. You will define network architectures, harden security, streamline operations via scripting.## Responsibilities**Architecture & Design*** Define scalable, secure LAN/WAN/SD-WAN architectures and standards for global sites* Produce high-quality HLD/LLD documentation, network diagrams, IP schemas, and security policies* Evaluate and select technologies aligned with performance, security, and cost goals.**Build & Implementation*** Install, configure, and optimize firewalls: Fortinet FortiGate and Cisco Firepower (including FMC, policy objects, IPS/IDS, SSL inspection, HA clustering, SD-WAN)* Configure enterprise switches: Cisco Catalyst/Nexus and Juniper EX/QFX (VLANs, STP, LAG/MLAG, VRRP/HSRP, QoS, port-security, 802.1X)* Implement site rollouts, migrations, and cutovers with minimal downtime* Maintain and configure SASE platform**Operation & Security*** Own Level 3 incident/problem management; perform advanced troubleshooting (packet captures, flow analysis, logs)* Maintain firewall and switch gold configs, rule hygiene, and change control (ITIL)* Ensure compliance with security baselines, segmentation, and zero-trust principles* Monitor capacity/performance and proactively remediate risks**Automation & Scripting*** Build and maintain automation for configuration, compliance checks, and deployments using Python and/or Ansible (e.g., templates, linting, CI/CD pipelines)* Develop scripts for backup/restore, inventory, API-based object management (Fortinet/Cisco/Juniper)**Collaboration & Governance*** Work cross-functionally with Workplace, Cloud, Security, and Site Operations teams* Support audits and contribute to policy development and continuous improvement* Mentor junior engineers; act as technical escalation point## Qualifications**Required Qualifications*** 5–8+ years in enterprise networking with multi-site/global exposure* Proven expertise with Fortinet FortiGate and Cisco Firepower (FMC), including policy creation, NAT, VPN (IPsec/SSL), and HA* Strong experience with Cisco and Juniper switching (Layer 2/3, routing protocols OSPF/BGP, EVPN/VXLAN nice to have)* Solid understanding of network security (segmentation, NAC/802.1X, IDS/IPS, TLS inspection), DNS/DHCP/IPAM, and PKI fundamentals* Automation: Proficiency in Python and/or Ansible for network tasks; experience with Git-based workflows* Experience operating under ITIL (Change/Incident/Problem) and creating high-quality documentation* Excellent communication skills; comfortable in an international environment.* Language: Professional English are required* Certifications (one or more of the following)* Fortinet: NSE 4/5/6 (NSE 7 is a plus)* Cisco: CCNP Enterprise or CCNP Security (CCIE a plus)* Juniper: JNCIS-ENT / JNCIP-ENT (JNCIE a plus)* Security: CompTIA Security+ or CISSP (plus)**Nice-to-Have*** Familiarity with cloud networking (Azure)* Exposure to modern NAC (Cisco ISE, Aruba Clearpass), SASE/ZTNA, and wireless (Cisco Meraki, Juniper MistAI )* Observability tools (e.g., SolarWinds, Zabbix, Grafana)Jobs at a location #J-18808-Ljbffr