Design, install and operate the internal network and server infrastructure for the L-mobile group, including continuous development
Plan and implement network segmentation and modern security measures (firewall, WAF, IPS, MFA)
Operate and expand our hybrid and multi-cloud and virtualization platforms (Microsoft Azure, Wortmann TerraCloud, VMware)
Take responsibility for securely connecting our national and international sites, operating VPN solutions and ensuring comprehensive protection for all endpoints
Maintain and monitor internal email systems including relevant security mechanisms (spam filters, SPF, DMARC, DKIM)
Work closely with management, the Head of Development, the CISO and external data protection officers to help shape the internal IT security strategy
Create and optimize concepts, policies and incident response plans for IT security and data protection
Plan budgets and act as a central interface between the internal IT team and software development
Document system configurations and support internal audits and security assessments

Completed IT training, a degree or equivalent qualification (e.g. IT technician)
Initial relevant professional experience in network or server administration — practical experience is more important than an exact number of years
Solid knowledge of networking technologies such as VLAN, routing and VPN, and a fundamental understanding of IT security
Experience with virtualization, storage, backup and cloud infrastructures, preferably Azure, Veeam or VMware
Hands-on experience with firewalls, switches and security solutions, ideally with Sophos and HP or Aruba systems
Strong knowledge of Windows Server administration and basic knowledge of Linux
Very good English skills at C1 level (spoken and written) and native-level German, as both languages are important for internal collaboration
High service orientation, strong analytical thinking and an independent, structured way of working
Good communication skills and enjoyment of collaboration with internal business units

High flexibility: individual scheduling, remote work, 30 days annual leave, working time account — overtime can be taken as time off
€50 per month tax-free benefit in addition to salary via the Probonio app (multi-benefit platform)
Freshly prepared, delicious and subsidized lunch daily in our on-site restaurant “Cooki Luki”
Freedom and dynamism: owner-managed company with no external investors
A great, diverse team that celebrates successes together and supports each other during challenges
Grow beyond your limits: in-house Learning & Development and individual expert and leadership coaching
Additional extras such as ergonomic and modern workstations, JobRad (company bike), company and sports events, refreshments and fruit, company pension plan, and more

Internal IT Infrastructure & Security Engineer

Key skills