Senior Windows Server Administrator

About Atos Group

Atos Group is a global leader in digital transformation with c. 67,000 employees and annual revenue of c. €10 billion, operating in 61 countries under two brands — Atos for services and Eviden for products. European number one in cybersecurity, cloud and high performance computing, Atos Group is committed to a secure and decarbonized future and provides tailored AI-powered, end-to-end solutions for all industries. Atos Group is the brand under which Atos SE (Societas Europaea) operates. Atos SE is listed on Euronext Paris.

The purpose of Atos Group is to help design the future of the information space. Its expertise and services support the development of knowledge, education and research in a multicultural approach and contribute to the development of scientific and technological excellence. Across the world, the Group enables its customers and employees, and members of societies at large to live, work and develop sustainably, in a safe and secure information space.

Windows Server Administrator for HPC:

We are looking for a Senior Windows Server Administrator to support a High-Performance Computing (HPC) environment. In this role, you’ll ensure the availability and performance of Windows-based infrastructure used by the CAT (Computer-Aided Testing) department, while collaborating with cross-functional IT teams and optimizing system operations. This is a hands-on position requiring strong troubleshooting, automation, and scripting skills in a hybrid Windows/Linux setup.

What are your tasks:

• Ensure high availability and performance of critical Windows Server infrastructure in an HPC environment.
• Install, configure, and manage Windows servers supporting CAE/CAT applications.
• Provide advanced troubleshooting and root-cause analysis for system- and application-level incidents.
• Implement and manage Windows Server updates, patching, and OS upgrades while minimizing downtime.
• Collaborate with the HPC/Linux team to ensure interoperability and performance optimization across hybrid environments.
• Manage user access rights, AD roles, group policies, and ensure alignment with compliance/security policies.
• Document issues, configurations, and solutions using Confluence, ITSM systems, or internal knowledge bases.
• Support application owners and end users by resolving infrastructure-related bottlenecks or integration issues.
• Leverage PowerShell and other scripting tools to automate system maintenance and monitoring tasks.
• Participate in "On Call" weekly shifts supporting off-hours and weekend activity.
• Automate the provisioning and configuration of large-scale infrastructure using platforms and tools like Red Hat Ansible (Chef/Puppet), Git-hub.
• Monitor Infrastructure health using existing solutions (Icinga or similar) and respond to hardware and software issues. Perform daily infrastructure changes
• Support and maintain backup and disaster recovery solutions (Veeam, TSM) to ensure data integrity and availability.

What do you bring with you:

• Strong Experience as a Windows Server Administrator in enterprise or HPC environments.
• Deep expertise in Windows Server (2016/2019/2022), including AD, DNS, DHCP, and GPOs.
• Solid PowerShell scripting skills for automation and system management.
• Experience working in or alongside HPC infrastructure and Linux systems (Red Hat/CentOS/Ubuntu) is a plus.
• Familiarity with backup & recovery solutions such as Veeam or IBM TSM.
• Experience with CAE/CAT applications is an advantage.
• Good understanding of virtualization (VMware/Hyper-V) and system performance tuning.
• Strong documentation skills; experience with Jira, Confluence, GitHub is a plus.
• Fluent in English (mandatory); German language skills are an advantage.

Interpersonal skills:

• Drive, proactive, self-motivated and willing to learn.
• Enjoy working in a team to solve complex issues.
• Ability to adjust to changing priorities.

  Why join us

• Training and Certifications: Access to continuous learning and career development opportunities.
• Flexible working environment
• Competitive salary and benefits package.
• Reimbursement: Get a yearly fixed amount for reimbursement.
• Performance Bonus: Earn an annual performance bonus based on your achievements.
• Career Advancement: Explore numerous opportunities for professional growth and career advancement.
• Extra Vacation Days: Take advantage of additional vacation days to relax and recharge.