We are looking for a Senior System Administrator to manage and scale our multi-cloud and on-prem environments, including air-gapped deployments in highly secure banking environments. You will handle Windows and Linux servers, web and database platforms, networking and VPNs, firewalls, and Cloudflare services. You’ll also build CI/CD pipelines, implement Infrastructure as Code, manage observability with Prometheus/Grafana/Wazuh, and ensure reliability, security, and compliance (ISO 27001, PCI DSS), including backup and disaster recovery. Key Responsibilities Infrastructure & Systems Administer Windows & Linux servers in cloud and isolated on-prem environments. Manage web servers (IIS, Apache/Nginx) and databases (MS SQL, Postgre SQL, MySQL). Manage domain controllers and related services, including Active Directory roles, replication, and group policy enforcement. Handle directory services: Active Directory and Entra ID (Azure AD). Oversee snapshots and backups. Networking & Security Design and maintain secure networks: VLANs, DNS/DHCP, load balancers. Configure VPNs (IPSec/Open VPN/Wire Guard) for site-to-site and remote access. Administer firewalls and WAF; manage Cloudflare (DNS, CDN, WAF, Zero Trust). Apply Zero Trust, MFA/SSO, and secrets management. Manage security solutions such as Kaspersky or equivalent tools to ensure device protection and compliance. Dev Ops & Automation Build and maintain CI/CD pipelines using open-source tools. Implement Infrastructure as Code (Terraform, Ansible) for provisioning and configuration. Manage and troubleshoot containerized environments using Docker and Kubernetes, including deployment, scaling, and monitoring. Monitoring & Compliance Deploy Prometheus and Grafana for metrics and dashboards. Operate Wazuh for SIEM/XDR (agent rollout, alert tuning, integrations). Ensure compliance with ISO 27001 and PCI DSS standards. Maintain audit-ready documentation and enforce security best practices. Reliability & Disaster Recovery Architect for high availability and fault tolerance. Design and maintain Backup & Disaster Recovery plans (RPO/RTO, immutable backups, DR drills). Support air-gapped environments with strict security and operational controls. Required Qualifications7–10 years of experience in IT Infrastructure, Dev Ops, or related roles. Strong Windows & Linux administration experience. Expertise in web servers (IIS, Apache/Nginx) and databases (MS SQL, Postgre SQL, MySQL). Hands-on with VPNs, firewalls, and Cloudflare. Experience with CI/CD, IaC (Terraform, Ansible), and containerization (Docker, Kubernetes). Ability to work with air-gapped environments and strict security controls. Scripting skills (Power Shell, Bash, or Python). Preferred Qualifications Familiarity with Prometheus, Grafana, and SIEM tools (e.g., Wazuh). Advanced Cloudflare (Zero Trust, tunnels, WAF tuning). Backup/DR tooling (Veeam, restic, Bacula). Endpoint management (Intune/MDM), CIS hardening benchmarks. Experience in regulated industries (finance, banking, e-commerce). Knowledge of ISO 27001 and PCI DSS implementation. Interpersonal & Language Skills Strong sense of accountability and ownership of tasks and outcomes. Proven ability to work effectively in team environments, collaborating across functions. Excellent problem-solving and adaptability in dynamic and complex situations. Clear and professional communication skills, both written and verbal. Mid to high English proficiency required for documentation, meetings, and cross-team collaboration. Ability to manage priorities, meet deadlines, and contribute to a culture of continuous improvement. What We Offer Competitive compensation package. Ownership of infrastructure and Dev Ops strategy. A collaborative environment with high impact and autonomy.