Senior Linux System Administrator

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.

Essential functions

• 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.

Qualifications

• 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 (configuration management tools like Ansible are a plus).
• Firm grasp of server hardening, security best practices and backup/recovery procedures.
• Advanced level of English (both written and spoken)

We offer

• 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

About us

Grid Dynamics (NASDAQ: GDYN) is a leading provider of technology consulting, platform and product engineering, AI, and advanced analytics services. Fusing technical vision with business acumen, we solve the most pressing technical challenges and enable positive business outcomes for enterprise companies undergoing business transformation. A key differentiator for Grid Dynamics is our 8 years of experience and leadership in enterprise AI, supported by profound expertise and ongoing investment in data, analytics, cloud & DevOps, application modernization and customer experience. Founded in 2006, Grid Dynamics is headquartered in Silicon Valley with offices across the Americas, Europe, and India.