Senior Network Engineer

About the role

Shift4 is looking for a Senior Network Engineer to join its EU network engineering team. The role helps operate, troubleshoot and improve business-critical networks across physical production data centers and networking services in AWS, Google Cloud and Cloudflare. It is a hands-on position covering data-center networking, firewalls, application delivery, remote access and cloud connectivity, working closely with Security, Systems, Corporate IT, NOC and application teams.

Key responsibilities

• Operate and improve enterprise and data-center infrastructure, including Cisco Nexus/Catalyst switching, Fortinet FortiGate firewalls, routing, network segmentation and ISP/WAN connectivity.
• Monitor network availability, performance and capacity; diagnose outages and traffic-flow issues using telemetry, logs, packet captures and protocol analysis.
• Support F5 BIG-IP application delivery services and troubleshoot end-to-end connectivity with application owners.
• Maintain VPN, remote-access and device-authentication services (FortiGate VPN, FortiAuthenticator, TACACS+/RADIUS).
• Support cloud and edge networking in AWS, GCP and Cloudflare, including DNS and traffic-delivery services such as Amazon Route 53 and AWS load balancers.
• Help maintain resilient services through high-availability design, redundant ISP connectivity, SD-WAN, monitoring, configuration backups and out-of-band recovery.
• Contribute to network architecture, capacity planning, infrastructure modernization and resiliency improvements.
• Implement approved upgrades and changes using documented change controls, pre-change checks, rollback plans and post-change validation.
• Work with the NOC and application teams on incident response, inter-site traffic routing and failover, and take part in root-cause analysis and corrective actions.
• Maintain diagrams, device and circuit inventory, procedures and incident records, and partner with Security on vulnerability remediation, configuration hardening and PCI/SOX controls where applicable.

Required profile

• Hands-on experience supporting enterprise or data-center networks in a production environment.
• Practical troubleshooting skills, including use of device CLIs, monitoring tools, logs and packet captures.
• An operational mindset: careful change execution, clear documentation, effective incident communication and attention to availability and security.
• Ability to collaborate across infrastructure, security and application teams and communicate technical findings clearly.

Required skills

• Strong TCP/IP, subnetting, VLAN, switching, routing and DNS fundamentals.
• Enterprise firewalls and Cisco or comparable switching platforms; VPNs, NAT, access controls, BGP/static routing and high-availability concepts.
• Experience with Fortinet, Cisco Nexus, F5 BIG-IP, AWS/GCP networking, Route 53, Cloudflare and load balancers is a plus.
• Experience with infrastructure monitoring, backup, inventory and recovery tools (e.g., OpsRamp, Unimus, Device42) and relevant certifications such as CCNA/CCNP or Fortinet/F5 credentials is a plus.