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 ResponsibilitiesInfrastructure & SystemsAdminister Windows & Linux servers in cloud and isolated on-prem environments.Manage web servers (IIS, Apache/Nginx) and databases (MS SQL, PostgreSQL, 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 & SecurityDesign and maintain secure networks: VLANs, DNS/DHCP, load balancers.Configure VPNs (IPSec/OpenVPN/WireGuard) 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.DevOps & AutomationBuild 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 & ComplianceDeploy 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 RecoveryArchitect 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, DevOps, or related roles.Strong Windows & Linux administration experience.Expertise in web servers (IIS, Apache/Nginx) and databases (MS SQL, PostgreSQL, 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 (PowerShell, Bash, or Python).Preferred QualificationsFamiliarity 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 SkillsStrong 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 OfferCompetitive compensation package.Ownership of infrastructure and DevOps strategy.A collaborative environment with high impact and autonomy.