Linux System Administrator

Linux System Administrator

MentorMate

Sofia, Bulgaria

Job Description

MentorMate, part of Tieto Tech Consulting, is looking for a highly skilled and motivated Linux System Administrator, a professional who will join a project within a Telecom Team for our respectful client BICS.

Areas of Responsibility

• Engage with business stakeholders to gather requirements and design solutions that align with engineering standards and support business needs.
• Design, implement, and manage Red Hat OpenShift clusters in on-premises (physical and virtualised) environments.
• Take ownership of systems engineering projects related to OpenShift infrastructure.
• Collaborate with development teams to containerize applications and optimize deployment and release workflows.
• Build and maintain CI/CD pipelines using OpenShift and associated DevOps tools.
• Automate operational and deployment tasks using Ansible and other scripting tools.
• Perform patching and upgrades of OpenShift clusters, ArgoCD, GitLab CI, and related components in compliance with change-management procedures.
• Design, implement, and maintain backup, disaster recovery, and redundancy strategies.
• Participate in on-call/standby rotation to support critical platform and infrastructure services and ensure service continuity.
• Support daily operations including trend analysis, root cause analysis, monitoring, troubleshooting, and resolution of platform issues to ensure high availability and reliability.
• Implement and enforce security best practices, including RBAC, vulnerability management, and compliance controls.
• Improve alerting, monitoring, and observability capabilities across OpenShift and related systems.
• When OpenShift-related workload is limited, perform general system administration activities, including Linux server administration, infrastructure maintenance, and support of data center services as part of the infrastructure team.
• Produce and maintain up-to-date documentation, including architecture diagrams, operational procedures, and runbooks.
• Provide knowledge transfer, mentoring, and training to colleagues on OpenShift, GitLab, and related infrastructure technologies.

Qualifications

• Bachelor’s degree in Engineering or Computer Science and at least four (4) years of relevant experience; or equivalent professional certifications (including Red Hat OpenShift training) with at least five (5) years of experience.
• Proven experience deploying, operating, and maintaining OpenShift and GitLab CI platforms.
• Experience in deploying and maintaining OpenShift and GitLab CI platforms
• Proficiency with Ansible and infrastructure automation practices.
• Solid experience in Linux system administration within enterprise or datacenter environments.
• Ability to document architectures, configurations, and standards, and to develop/maintain SOPs and training materials.
• Fluency in English (spoken and written).

Will be an advantage

• Knowledge of ITIL Service Operations principles.
• Experience with ArgoCD, monitoring/observability stacks (Prometheus, Grafana, etc.), or disaster recovery tooling (optional but valuable).

Personality & Soft Skills

• Solution-oriented mindset.
• Strong analytical and technical problem-solving abilities.
• Ability to work autonomously with minimal guidance, operate at multiple levels of abstraction, and handle ambiguity effectively.
• Ability to understand business drivers, stakeholder expectations, and translate them into technical solutions.
• Ability to balance strategic considerations with operational practicality.
• Excellent communication and collaboration skills; capable of influencing, guiding, and leading distributed technical teams.
• Ability to produce high-quality architectural documentation and visual design diagrams (e.g., Visio).
• Passionate about technology and its impact on business outcomes.
• Highly motivated team player with a “can-do” attitude, dedication, transparency, and integrity.
• Comfortable working in a multicultural, international environment.