Network Administrator; m​/f​/d

Stellenbezeichnung: Network Administrator (m/f/d)
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Job Description We 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 Forti Gate 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 Forti Gate 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., Solar Winds, Zabbix, Grafana)
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