Senior Windows Server Administrator

About Bull

Bull is a story. One with a century of European innovation and a working environment where experts design powerful, sustainable, and sovereign digital solutions, enabling states and industries to retain full control over their data and their AI.

Bull is also thousands of engineers, researchers and passionate tech people shaping the future of high‑performance computing, AI, and quantum technologies.

Every day, our teams push the boundaries of what is technologically possible – from next‑generation HPC architectures to exascale supercomputers – supported by world‑class R&D, more than 1,600 patents, and unique end‑to‑end capabilities spanning hardware design, software engineering, data science and quantum research.

We are a people‑centric, innovation‑driven company, where collaboration spans Europe, the Americas and India. We share a common vision of a responsible and sustainable innovation that delivers concrete impact for our customers.

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.

Join Us!

Here, your ideas, your curiosity and your technical excellence directly shape the next era of advanced computing - unlocking enterprise value, accelerating scientific progress and driving positive impact for society.