[Skip to main content](#main-content)

[OpenNash Jobs](https://jobs.opennash.com/)
[Hiring report](/reports/hiring/) · [All ArcelorMittal jobs](https://jobs.opennash.com/companies/arcelormittal/) · [Search jobs](/search/)

ArcelorMittal

# DE4_Administrator IT

Duisburg, Nordrhein-Westfalen, Germany Full-time IT & Infrastructure 

Listed on ArcelorMittal’s official careers site. Posted August 18, 2025. Check that it is still open and apply there.
[Apply on ArcelorMittal’s careers site →](https://emfg.fa.em4.oraclecloud.com/hcmUI/CandidateExperience/en/sites/CX_4001/job/29253)

[OpenNash Jobs](https://jobs.opennash.com/) / [ArcelorMittal](https://jobs.opennash.com/companies/arcelormittal/) / DE4_Administrator IT

## Job description

Main tasks The IT Infrastructure Expert will be in charge of: Maintaining and supporting Client & Server environments Supporting End users and technical teams in incident analysis and resolution Maintaining the Network based on Cisco & Siemens devices Maintaining Security devices based on Fortinet Analysing and resolving of virtual and physical network related incidents Providing support and guidance for OT teams in network management Supporting the hardening of IT and OT devices by enforcing policies and monitoring access to them.

Participating in planning and execution of IT-related projects Providing a 24/7 support (on call duty) Specific Knowledge
- 3+ years experience in IT-Infrastructure
- Ability to work in Industrial Environment
- Strong knowledge in client and server OS (Windows necessary, Linux is an advantage) Good knowledge in O365 challenge (Skype/Teams especially) and cloud proxy technology
- Strong knowledge in Network technology: LAN/Routing on Cisco (certification is an advantage) and optionally Siemens network devices Good knowledge in WLAN technology: Cisco Wireless Controller Basic knowledge about Firewall/IPS management (Cisco and Fortigate)

### Basic knowledge on Routing protocols

static, OSPF and WAN routing Basic knowledge of F5 products especially the F5 Big IP APM Basic knowledge of Cloud
- Design and Architecture (Azure, AWS, OCI,..)
- Knowledge on optical fiber connection analysis and splicing is an advantage.

Knowledge on Alcatel Lucent telephone systems and FTA infrastructure is an advantage.

### Effective communication skill with non-IT users Languages

German (mother tongue), Fluent English is required Any other language will be considered as a plus.

## At a glance
- Posted by the employer: Aug 18, 2025
- First seen by OpenNash: Oct 19, 2026
- Last checked: Oct 19, 2026
- Listed for: Over a year
- Location: Duisburg, Nordrhein-Westfalen, Germany
- Employment type: Full-time[Apply on ArcelorMittal’s careers site →](https://emfg.fa.em4.oraclecloud.com/hcmUI/CandidateExperience/en/sites/CX_4001/job/29253)

## More jobs at ArcelorMittal

### [Senior Auditor](https://jobs.opennash.com/companies/arcelormittal/jobs/8e5b7b11640d1cb43a50/)

Duisburg, Nordrhein-Westfalen, Germany

### [GTZ Infrastructure](https://jobs.opennash.com/companies/arcelormittal/jobs/260e8675b0d08334d7cc/)

Liège, Belgium

### [Global IT Compliance Officer](https://jobs.opennash.com/companies/arcelormittal/jobs/2ad51544a8125a2b27ff/)

Luxembourg

### [IT Head of Digital & AI Acceleration Factory](https://jobs.opennash.com/companies/arcelormittal/jobs/61e498e7fd0a4474034e/)

Luxembourg

### [IT Procurement Internship - 12 months](https://jobs.opennash.com/companies/arcelormittal/jobs/b7b352005a2b39e9d6a5/)

Luxembourg

## Similar jobs at other companies

### [Contract Administrator](https://jobs.opennash.com/companies/acciona/jobs/91bdab75bb1d26f6bee4/)

Acciona · Melbourne

### [Administrator](https://jobs.opennash.com/companies/deutsche-post/jobs/f44ac0d994360d0a4572/)

Deutsche Post · Selangor, Malaysia

### [Site Administrator](https://jobs.opennash.com/companies/deutsche-post/jobs/ffaf604d398db19ebb49/)

Deutsche Post · Australia

### [Administrator](https://jobs.opennash.com/companies/aramark/jobs/a5b1db6aa4513ec7c05f/)

Aramark · Cork, CO, IE

### [Contract Administrator](https://jobs.opennash.com/companies/siemens/jobs/faf2c69e3a054765b2ac/)

Siemens 

OpenNash lists jobs from employers’ own careers sites and does not handle applications.
Dates come from the employer where stated; “first seen” and “last checked” are our own observations.

OpenNash Jobs · Official listings with dates and links to the employer. [Weekly hiring report](/reports/hiring/) · [Methodology](/methodology/)