Senior System Administrator

About the role

We are seeking a Senior System Administrator to lead the management and scaling of our multi‑cloud, on‑premise and air‑gapped environments for a highly secure banking operation. You will ensure reliability, security and compliance across Windows and Linux platforms, networking, and cloud services.

Key responsibilities

• Administer Windows and Linux servers in cloud, on‑premise and isolated environments.
• Manage web servers (IIS, Apache, Nginx) and databases (MS SQL, PostgreSQL, MySQL).
• Maintain Active Directory, Azure AD (Entra ID), domain controllers and group policies.
• Design and operate secure networks, VLANs, DNS/DHCP, load balancers and VPNs (IPSec, OpenVPN, WireGuard).
• Configure firewalls, WAFs and Cloudflare services (DNS, CDN, Zero Trust).
• Build CI/CD pipelines and implement Infrastructure as Code using Terraform and Ansible.
• Deploy and manage containerized workloads with Docker and Kubernetes.
• Implement observability with Prometheus, Grafana and SIEM/XDR using Wazuh.
• Ensure compliance with ISO 27001, PCI DSS and maintain audit‑ready documentation.
• Design backup and disaster‑recovery strategies, conduct DR drills and support immutable backups.

Required profile

• 7–10 years of experience in IT infrastructure, DevOps or related roles.
• Strong hands‑on experience with Windows and Linux administration.
• Proven expertise in web servers, databases and directory services.
• Experience managing firewalls, VPNs and Cloudflare in regulated environments.
• Solid background in CI/CD, IaC, container orchestration and monitoring.
• Ability to work with air‑gapped systems and strict security controls.
• Proficient scripting skills (PowerShell, Bash or Python).

Required skills

• Windows Server, Linux (RHEL/CentOS, Ubuntu)
• IIS, Apache, Nginx
• MS SQL, PostgreSQL, MySQL
• Active Directory, Azure AD (Entra ID)
• VLAN, DNS, DHCP, load balancers
• IPSec, OpenVPN, WireGuard
• Firewalls, Cloudflare (DNS, CDN, Zero Trust)
• Terraform, Ansible
• Docker, Kubernetes
• Prometheus, Grafana, Wazuh
• ISO 27001, PCI DSS compliance
• Backup tools (Veeam, restic, Bacula)
• PowerShell, Bash, Python scripting