Senior Unix System Administrator

Job Title: Senior Unix Administrator

Location: Cracow, Poland

Office Requirement: 6 days/month

Contract Type: Long Term B2B Contract

Job Overview

We are looking for an experienced Unix Systems Administrator to join a global infrastructure team supporting Linux server environments and DevOps infrastructure delivery. The role involves configuring, implementing, maintaining, and troubleshooting Linux-based systems across production and non-production environments.

You will collaborate with application development teams, infrastructure specialists, and engineering teams to deliver reliable, secure, and efficient infrastructure services. A key focus will be on automation, service improvement, incident resolution, and maintaining high standards of operational excellence.

Key Responsibilities

• Configure, deliver, and support Linux/Unix server environments and infrastructure services.
• Implement new technologies and provide ongoing support for hardware and software solutions across production and non-production environments.
• Work with application development and DevOps teams to deploy and consume centrally provided infrastructure services.
• Provide technical support while ensuring compliance with internal policies, security standards, and operational best practices.
• Develop and maintain Linux/Unix scripts to automate operational activities and reduce repetitive manual tasks.
• Identify opportunities to improve service delivery, operational efficiency, and automation capabilities.
• Provide technical guidance on Unix/Linux architecture, design, and best practices throughout the infrastructure lifecycle.
• Maintain capacity management standards, monitor infrastructure utilization, and identify potential capacity issues.
• Assess, analyse, document, and implement infrastructure changes based on technical and business requirements.
• Troubleshoot incidents, perform root cause analysis, and implement preventive measures to reduce recurring issues.
• Collaborate with application, infrastructure, engineering, and support teams to deliver effective technical solutions.
• Maintain technical documentation, operational procedures, and infrastructure standards.
• Support service improvement initiatives and contribute to the achievement of agreed service-level objectives.

Essential Technical Skills and Experience

• Linux Administration: 6–10 years of experience in Linux/Unix administration, with strong expertise in Red Hat Enterprise Linux (RHEL).
• Veritas Technologies: Knowledge of and troubleshooting experience with Veritas Volume Manager (VxVM) and Veritas Cluster Server (VCS).
• Storage Infrastructure: Experience configuring filesystems on NAS storage and EMC SAN solutions, including standalone and clustered environments and storage replication.
• Linux Architecture: Strong understanding of volume managers, multipathing, kernel parameter tuning, and Linux system architecture.
• Scripting and Automation: Experience with shell scripting and/or Perl or Python for automating operational tasks.
• Infrastructure Platforms: Experience with IBM and HP x86 hardware and virtualization technologies such as VMware, Citrix, or Hyper-V.
• Networking: Knowledge of network infrastructure and protocols, including TCP/IP, UDP, LAN/WAN, load balancing, firewalls, virtual IPs, and related technologies.
• Configuration Management: Experience with DevOps and configuration management tools such as Ansible, Puppet, or Chef.
• Enterprise Environments: Experience supporting large-scale enterprise infrastructure, preferably within a regulated industry such as financial services.
• Operational Support: Experience with incident management, root cause analysis, change management, and service operations.

Desirable Skills and Experience

• Experience with SLES and Solaris, including x86 and SPARC platforms.
• Industry-recognized Unix/Linux certifications.
• Knowledge of ITIL principles and IT service management practices.
• Experience working in Agile environments.
• Familiarity with infrastructure design patterns, security standards, and operational best practices.
• Experience supporting middleware technologies such as WebSphere, Apache HTTP Server, Tomcat, IIS, and MQ.
• Knowledge of databases such as Oracle, Oracle RAC, Microsoft SQL Server, Sybase, or DB2.
• Exposure to enterprise application integration, Java, XML/XSLT, HTML/JavaScript, market data technologies, grid computing, or distributed application platforms.
• Experience designing and supporting infrastructure solutions across multiple technology layers.

Key Competencies

• Strong analytical and troubleshooting skills, with a proactive approach to identifying and resolving technical issues.
• Excellent written and verbal communication skills, including the ability to explain complex technical concepts clearly.
• A collaborative, team-oriented mindset and the ability to work effectively with globally distributed teams.
• Ability to work independently, manage priorities, and deliver results under pressure.
• Strong customer-service orientation and commitment to delivering reliable infrastructure services.
• A continuous-improvement mindset, with a focus on automation, efficiency, and service quality.
• Sound decision-making skills and the ability to take ownership of technical issues and outcomes.
• Understanding of IT governance, compliance requirements, and operational procedures.
• Willingness to support scheduled weekend work and participate in an on-call rotation.