Linux system administrator for B2B SaaS

At Grid Dynamics, we are looking for a Senior Linux System Administrator to maintain and modernize the global hybrid infrastructure supporting an enterprise AI-powered B2B SaaS platform. You will join a small, highly skilled technical team operating across physical servers, cloud instances and Kubernetes clusters in AI-first environment.

• Monitor, maintain and optimize Linux infrastructure across multiple regions and cloud providers.
• Ensure high availability, performance and stability for core services, including web, database and backup systems.
• Execute operating system updates and security patches with thorough testing, validation and documentation.
• Diagnose and resolve system, network and performance bottlenecks across production and staging environments.
• Support modernization initiatives, including the migration of services and workloads to Kubernetes.
• Administer containerized services (e.g., Postfix, monitoring, SSO) alongside Apache, PostgreSQL, Nextcloud, and Office 365 integrations.
• Oversee backup, recovery and system hardening practices in alignment with ISO 27001 standards.
• Configure and manage VPNs, DNS, firewalls and routing across distributed regions, maintaining strict access control and change auditability.
• Develop automation scripts and improve system configuration management and monitoring coverage.
• Coordinate with development and QA teams to maintain reliable staging environments for safe releases.
• Participate in a shared on-call rotation for critical production incidents.
• Author and update technical runbooks, disaster recovery plans and operational standards.

• 7+ years of hands-on production Linux administration experience with strong troubleshooting and monitoring skills (AlmaLinux or RHEL preferred).
• Production experience managing cloud infrastructure on at least one major platform (AWS, Oracle Cloud or GCP).
• Practical administration experience with Docker and Kubernetes environments.
• Solid networking foundation, including VPN configuration, DNS management, firewall rules and routing.
• Strong experience administering Apache web servers, PostgreSQL databases and Postfix mail servers.
• Proficiency in Bash scripting for automation and maintenance.
• Firm grasp of server hardening, security best practices and backup/recovery procedures.
• Advanced level of English (both written and spoken)
• Будет плюсом: configuration management tools like Ansible

• Opportunity to work on bleeding-edge projects
• Work with a highly motivated and dedicated team
• Competitive salary
• Flexible schedule
• Benefits package - medical insurance, sports
• Corporate social events
• Professional development opportunities
• Well-equipped office