IT Infrastructure & Security Manager (m/f/d)

Quantum-Systems GmbH; Germany (OH); On-site; USD 90,000 - 120,000; Full time

Benefits offered by this job

Company pension scheme

Flexible working hours

Mobile Work option

Access to fitness facilities

Bike-Leasing support

Corporate Benefits

Employee events

Sponsored lunch budget

Company Shuttle service

Job summary

Quantum-Systems GmbH is seeking an IT Infrastructure & Security Manager to oversee IT landscape across multiple locations in the United States and Ohio. This role involves managing infrastructure, ensuring security, and supporting company growth through innovative IT solutions.

The ideal candidate will thrive in a dynamic international environment, combining expertise in infrastructure and a security-first approach. Responsibilities also include optimizing Microsoft 365 services, monitoring network performance, and contributing to IT projects.

Qualifications

• Hands-on experience in IT infrastructure administration.
• Good knowledge of Microsoft 365 services and cloud.
• Fluency in English; German is a plus.

Responsibilities

• Manage and maintain IT infrastructure including servers and cloud services.
• Implement and improve security controls and policies.
• Provide second-level support for complex incidents.

Skills

IT infrastructure management

Microsoft 365 administration

System management

IT security principles

Networking concepts

Analytical skills

Education

Degree in Computer Science or IT

CCNA

CompTIA+

Tools

Microsoft Intune

Veeam Backup

Firewalls (Fortigate, Sophos)

Job description

As an IT Infrastructure & Security Manager (m/f/d), you will play a vital role in maintaining, securing, and continuously improving our IT landscape across multiple locations. Working closely with internal stakeholders and technical teams, you will help ensure the reliability, performance, and security of our infrastructure while supporting the company's growth and innovation. We are looking for a hands‑on professional who combines strong infrastructure expertise with a security‑first mindset and enjoys working in a dynamic, international environment.

What is your Day to Day Mission:

• Manage and maintain our IT infrastructure, including Windows and Linux servers, cloud services, and endpoint devices.
• Ensure the availability, performance, and security of business‑critical systems and services.
• In regard to security administer and optimize Microsoft 365 services, including Entra ID, Intune, Exchange Online.
• Implement, monitor, and continuously improve security controls, policies, and best practices across the organization.
• Manage Mobile Device Management (MDM) solutions and endpoint security platforms for Windows, macOS, and mobile devices.
• Support and maintain virtualization environments and infrastructure services.
• Monitor network performance and security, troubleshoot connectivity issues, and collaborate on infrastructure improvements.
• Review and maintain Firewall configurations (Fortigate Infrastructure, Sophos).
• Provide second‑level support for complex infrastructure and security‑related incidents.
• Contribute to IT projects, process improvements (BSI‑Grundschutz, ISO /IEC 27001).

What you bring to the team:

• A degree in Computer Science, Information Technology, or a comparable qualification and professional experience (CCNA, CompTIA+).
• Hands‑on experience in IT infrastructure administration, system management, or IT operations.
• Good knowledge of Microsoft 365 administration, including Intune, Entra ID, and related cloud services.
• Experience working with Windows environments; familiarity with Linux and macOS is highly desirable.
• Solid understanding of IT security principles, endpoint protection, identity management, and system hardening.
• Solid knowledge of networking concepts, including TCP/IP, DNS, DHCP, VPNs, and firewalls.
• Knowledge in backup procedures (Veeam Backup).
• Strong analytical and troubleshooting skills with a structured and solution‑oriented approach.
• The ability to communicate technical concepts clearly to both technical and non‑technical stakeholders.
• A proactive mindset, willingness to take ownership, and enthusiasm for learning new technologies and security trends.
• Fluency in English; German language skills are considered a plus.

Our benefits:

• Company pension scheme: We support you so that you can already make provisions for later.
• Flexible working hours: With trust‑based working hours, you are not only responsible for your working hours, but also for your work‑life balance.
• Mobile Work: If things get a little busy in the office, you have the option to work remotely one flexible day per week to create the right balance.
• Stay active: With EGYM Wellpass, you get access to thousands of fitness and sports facilities — and of course, we subsidize the membership.
• Bike‑Leasing: We support you in staying environmentally mobile and healthy.
• Corporate Benefits: Your opportunity for attractive offers and discounts from well‑known suppliers and brands, e.g. Adidas, Apple, Expedia.
• Employee events: We not only want to grow together, but also celebrate our successes together.
• Lunch‑Card: Be powerful with delicious energy, daily lunch budget is sponsored.
• Company Shuttle: Enjoy our convenient shuttle service that picks you up from Pasing in Munich and brings you to our location, with return trips at the end of the workday.

Our commitment:

We are an open‑minded company that not only values diversity, but actively promotes it. Regardless of gender, age, ethnic origin, religion, sexual orientation or disability, we firmly believe that the diversity of our employees is an essential part of our success.

At our company, every voice is heard and every perspective is valued. We believe that our differences enrich us and help us to find creative solutions and generate innovative ideas. We pride ourselves on creating an inclusive work environment where all employees can reach their full potential.