IT Network Administrator (f/m/d)

The role

You will maintain, secure, and modernize network infrastructure across office, testing, and cloud environments. This hands-on role involves multi-vendor network operations, multi-tier support, and infrastructure projects.

What you will do

• Ensure reliable, high-availability, and secure operation of the global IT network environment.
• Install, configure, optimize, and maintain network devices from various hardware vendors.
• Monitor network stability, bandwidth, and traffic metrics.
• Provide 1st, 2nd, and 3rd-level support for network and connected system environments.
• Analyze, troubleshoot, and perform root-cause analysis on network outages or faults.
• Identify workflow bottlenecks and implement automated support solutions.
• Participate in the design, planning, and execution of global IT infrastructure and connectivity projects.
• Work with software engineering and data teams to ensure reliable network routing and cloud VPC connectivity.

Required qualifications

• 3–5+ years of hands-on experience in Network Administration, Systems Administration, or Network Engineering.
• Proven track record of managing multi-vendor network environments and recovering complex infrastructure from outages.
• Strong analytical, problem-solving, and communication skills in collaborative technical environments.
• Practical understanding of TCP/IP, BGP, OSPF, VLAN segmentation, DNS, DHCP, NAT, and IPsec VPNs.
• Hands-on experience configuring and troubleshooting enterprise switches, routers, firewalls, and wireless controllers across major vendors.
• Experience utilizing network monitoring tools (e.g., Checkmk, Grafana, Wireshark, or SNMP-based platforms).
• Conceptual understanding of Ansible, Terraform, Bash, or Python to read, understand, run, and troubleshoot existing scripts and playbooks.
• Familiarity with Linux (Debian/RHEL) and Windows network configuration and troubleshooting.

Nice to have

• Experience working in a dynamic, fast-paced environment (e.g., startup, scale-up, or rapidly growing enterprise).
• Cisco Certified Network Associate/Professional (CCNA/CCNP)
• Juniper Networks Certified (JNCIA/JNCIS), or equivalent network engineering credentials.

Benefits

• Employee Participation Program: virtual company share program
• 30 days of vacation
• Company pension plan with 20% employer contribution after the probation period
• Subsidised lunch
• Flexible mobility budget: Deutschlandticket, JobRad bicycle leasing, FINN JobAuto, or a fuel allowance
• Rental clothing with laundry service
• Sport Clubs membership (EGYM Wellpass)
• Individual learning allowance granted after the probation period
• Childcare allowance for non-school-age children

Before you apply

• Due to security clearance requirements, affiliations with countries listed under § 13 para. 1 no. 17 SÜG may affect the application process.

About the company

Isar Aerospace is a fast-growing company building a modern space business to provide sustainable and environmentally friendly launch solutions for small and medium-sized satellites into Low Earth Orbit.