Manager Network & Systems Administration (m/f/d)

## Mission Brief We are seeking a hands-on Manager Network & Systems Administrationto lead, maintain, and modernize our hybrid infrastructure. In this role, you will act as both a technical lead and an infrastructure owner, bridging our on-premise virtualization, enterprise networking, and multi-cloud environments.

This is a hands-on lead position designed for a senior engineer who excels at architecture, network engineering, and troubleshooting while serving as the primary technical authority for our infrastructure.

You will be responsible for end-to-end reliability, system security, network connectivity, and overseeing automated deployment workflows - from bare-metal hypervisors to cloud routing. ## Technical Leadership & Operations - Hands-on Infrastructure Leadership: Serve as the primary technical subject matter expert (SME) and escalation point for all systems, virtualization, and network architecture. - Vendor & Asset Management: Oversee infrastructure vendor relationships, license agreements, hardware lifecycles, and service level agreements (SLAs). - Incident & Capacity Planning: Lead major incident responses, perform root-cause analysis (RCA), and proactively monitor capacity across storage, compute, and network links. ## Multi-Cloud & Virtualization Management - Hybrid & Multi-Cloud Administration: Design, secure, and maintain scalable infrastructure across Azure, AWS, and IONOS Cloud. - On-Premise Virtualization: Oversee, optimize, and maintain our enterprise hypervisor clusters using VMware vSphere (ESXi/vCenter) and Proxmox VE (KVM/LXC). - Disaster Recovery & Data Protection: Plan, implement, and test automated backup, recovery, and high-availability strategies across all platforms. - Infrastructure Automation Concepts: Understand and support Infrastructure as Code (IaC) workflows (Terraform/Ansible) to streamline server provisioning, configuration management, and patching. ## Enterprise Networking & Security - Network & Connectivity Management: Design, configure, and troubleshoot complex network architecture involving Cloud VPCs, Site-to-Site IPsec VPNs, VLAN segmentation, DNS, DHCP, and firewalls. - Traffic Management: Manage load balancing, ingress routing, and perimeter security to ensure high availability and zero-trust access principles. ## Qualification Checklist - Operating Systems: Advanced, expert-level proficiency in Debian and/or Red Hat Enterprise Linux (RHEL) . - Virtualization: Deep hands-on expertise with VMware (ESXi/vCenter) and Proxmox VE (KVM/LXC) . - Cloud Platforms: Proven experience managing production environments in Azure and AWS (familiarity with IONOS Cloud is a major plus) . - Networking & Firewalls: Strong understanding of TCP/IP, BGP/OSPF routing, DNS, Load Balancing (HAProxy/Nginx), enterprise Firewalls, and IPsec VPNs. - Automation & Scripting (Conceptual): Solid conceptual understanding of Ansible , Terraform , Bash , or Python - ability to read, understand, run, and troubleshoot existing playbooks and scripts. - Storage & Backups: Experience managing enterprise storage protocols (iSCSI, NFS, SAN) and backup tools (e.g., Veeam or built-in virtualization snapshot engines). - 5+ years of hands-on experience in Systems Administration, Network Engineering, or Cloud Architecture, with demonstrated experience acting in a lead or senior capacity. - Proven track record of architecting, deploying, and maintaining hybrid cloud and multi-site network environments. - Strong communication skills with the ability to bridge technical requirements and business objectives. ## Bonus Skills - Linux: Red Hat Certified Engineer (RHCE) or Linux Foundation Certified Engineer (LFCE) - Cloud: Microsoft Azure Administrator (AZ-104), AWS Certified SysOps Administrator, or Solutions Architect - Networking/Virtualization: VMware Certified Professional (VCP) or Cisco Certified Network Associate/Professional (CCNA/CCNP) ## Benefits - Employee Participation Program: Share in our success through our virtual company share program - 30 days of vacation: Enjoy the days off to relax and recharge - Company pension plan: Secure your future with our company pension plan, featuring a 20% employer contribution after the probation period - Subsidised lunch: Stay energised with delicious, subsidised lunches every day - Flexible mobility budget : Travel your way with a choice between a fully financed Deutschlandticket, JobRad bicycle leasing, FINN JobAuto, or a fuel allowance - Rental clothing with laundry service: Enjoy hassle-free workwear with our convenient rental clothing and laundry service - Sport Clubs membership: Stay fit with our sponsored sports club memberships (EGYM Wellpass) - Individual learning allowance: Grow your skills with an individual learning budget granted after the probation period - Childcare allowance: Receive a childcare allowance for your non-school-age children - And Much More!

Discover additional perks and benefits when you join our team. ## Who we are We are Isar Aerospace and we are at the forefront of New Space building a modern space business to enable faster, better and cheaper access to space. Our mission is to help democratise space and use it for good in order to improve life on Earth now and for the future generations.

We are a fast-growing company aiming to provide sustainable and environmentally friendly launch solutions for small and medium-sized satellites and constellations into Low Earth Orbit. The company is privately funded by world-leading technology investors with strong commitment and support and our team is made of driven and talented people with a real passion for space innovation.

We're making rockets in a way that hasn't been done before disrupting a traditional industry. If you are up for the challenge, want to work on cutting-edge projects and be part of a team changing the world for better, come, join us and launch your career! Want to find out more about us?

Visit www.isaraerospace.com Data ProtectionWe process your personal data for the purpose of managing the recruitment process and assessing your application. For detailed information on how your data is processed, including your rights, please refer to our Privacy Policy . Disclaimer Isar Aerospace SE is an equal-opportunity employer committed to fairness and inclusivity.

We do not prioritize any specific religion, gender, nationality, or background. Due to security clearance requirements, affiliations with countries listed under § 13 para. 1 no. 17 SÜG may affect the application process. All qualified applicants are encouraged to apply.