Senior Freelancer IT Infrastructure / Network & Security Engineer

Project overview

We currently have the opportunity to shape an interim mandate with us at short notice and take on the following role:

Senior Freelancer IT Infrastructure / Network & Security Engineer – Interim Support Infrastructure Team

Below we have compiled the framework data, tasks, and requirements for a better overview:

Framework Data

• Start: ASAP (ideally with handover by the end of November 2026)
• Duration: 6 months
• Utilization: 3-5 days/week
• Location: Greater Stuttgart area
• Remote share: expected approx. 80% remote (team works approx. 80% remote); completely remote possibly
• Language: German fluent / native, English good to fluent

Responsibilities

Requirements (Must-have)

Requirements (Nice-to-have)

Profile (Summary)

We are looking for a Senior Infrastructure Engineer with extensive operational experience who can quickly familiarize themselves with existing enterprise infrastructures, take on operational responsibility, and at the same time independently work on project packages. Experience with hybrid on-premise/cloud infrastructures is an advantage.

• Ensuring operational continuity in the infrastructure team after the departure of an internal IT System Engineer
• 2nd/3rd level support including complex troubleshooting in the infrastructure and network environment
• Operational responsibility for Enterprise Networking (LAN/WLAN/VLAN) including analysis and fault resolution
• Firewall administration and support for network segmentation
• Participation in infrastructure and security projects (hands-on implementation)
• Administration/further development of Active Directory and GPOs
• Support in the area of PKI / Certificate Management (ideally AD CS)
• Participation in RADIUS / Microsoft NPS / 802.1X
• Security Hardening / Infrastructure Security
• Documentation and structured knowledge transfer for handover to the team
• Very strong hands-on experience as a Senior Infrastructure Engineer (Enterprise environment)
• Networking + Firewall + Troubleshooting (mandatory)
• Very good knowledge in at least one/several of the following areas:
• Check Point (ideal), Cisco, Extreme Networks / ExtremeCloud
• Microsoft Active Directory and Group Policies (GPO)
• PKI / Certificate Management, ideally AD CS
• RADIUS / Microsoft NPS / 802.1X
• Microsoft Entra ID including Conditional Access
• PowerShell
• VMware, Veeam
• PRTG
• XM Cyber
• Trend Micro / Microsoft Defender
• Windows Server and Azure (hybrid environments)

Project details

• Start: ab sofort
• Duration: 6 Monate
• Remote: hybrid
• Location: stuttgart, Deutschland, DE
• Languages: German