Harmattan AI is a next-generation defense prime building autonomous and scalable defense systems. Following the close of a $200M Series B, valuing the company at $1.4 billion, we are expanding our teams and capabilities to deliver mission-critical systems to allied forces.
Our work is guided by clear values: building technologies with real-world impact, pursuing excellence in everything we do, setting ambitious goals, and taking on the hardest technical challenges. We operate in a demanding environment where rigor, ownership, and execution are expected.
This role is created to own and scale Harmattan AI's core infrastructure as we grow at pace. The Senior System & Network Administrator will take full technical ownership of our on-prem and cloud systems, ensuring high availability, resilience, and security across all layers of the infrastructure.
We are a small but highly capable IT team, and we work that way by design. Beyond your core responsibilities, there will be no shortage of challenging and interesting projects to get involved in — from security initiatives to tooling improvements and cross-functional IT projects. As the company scales, so will the complexity and scope of the infrastructure, and with it, your opportunity to grow into a lead or architect role. We are looking for someone who operates autonomously, makes decisions with confidence, and is genuinely excited to contribute beyond their defined perimeter.
The role includes on-call duties shared across the IT team to ensure continuity of critical services.
Administer and maintain Linux and Windows servers across our on-prem and Google Cloud Platform (GCP) environments
Define and enforce update and patching policies across all systems
Monitor system health, performance, and availability; respond to incidents proactively
Manage virtualization environments and storage infrastructure
Design, implement, and regularly test backup and disaster recovery policies
Ensure data integrity and define recovery time and point objectives (RTO/RPO)
Document and maintain business continuity procedures
Configure and maintain network equipment (switches, firewalls, routers, VPN)
Manage network segmentation, VLANs, and access control policies
Monitor network performance and troubleshoot connectivity issues
Oversee Wi-Fi infrastructure across company sites
Administer and optimize our Google Cloud Platform environment
Contribute to infrastructure-as-code practices (Terraform, Ansible, or equivalent)
Automate repetitive operational tasks to improve team efficiency and reliability
Participate in cloud cost optimization efforts
Write and maintain clear technical documentation, runbooks, and architecture diagrams in Confluence
Lead or contribute to infrastructure improvement projects
Act as a technical escalation point for the L1/L2 support team
Experience: Around 5 years of experience in system and/or network administration, with demonstrated ownership of production environments
Systems: Strong command of Linux server administration; Windows Server experience is a plus. Familiarity with macOS endpoints in a managed fleet context
Networking: Solid expertise in network configuration and troubleshooting (TCP/IP, DNS, DHCP, VLANs, firewalls, VPN)
Autonomy: Proven ability to operate independently, prioritize without close supervision, and drive projects to completion
Cloud & Automation: Experience with GCP is a strong plus; familiarity with infrastructure-as-code or scripting (Python, Bash) is appreciated
Adaptability: Comfortable in a fast-scaling environment and willing to contribute across topics beyond core system and network administration
Communication: Strong written and spoken English is required — we are an international company and English is our working language. French is a plus
On-call: Availability to participate in a shared on-call rotation (astreintes) as part of the team
Commitment: 100% dedication to Harmattan AI’s mission, vision, and ambitious growth trajectory, with a willingness to put in extra effort to achieve breakthrough results.
We look forward to hearing how you can help shape the future of autonomous defense systems at Harmattan AI.
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