Enterprise Windows & Unix Systems Engineer

Avon; Warszawa; On-site; PLN 180,000 - 280,000; Full time

Job summary

Avon is seeking a Windows & Unix Engineer to ensure stability, security, and performance of enterprise server environments across Windows, Linux, and AIX. You will provide Level 2 support, manage virtualised environments, and collaborate with cross-functional teams to keep critical services running smoothly.

The role emphasizes patching, migrations, security remediation, and disaster recovery readiness, with strong focus on AD, backups, and incident management.

Qualifications

• Proven experience supporting enterprise Windows Server environments.
• Experience administering Linux and/or AIX in large-scale production environments.
• Strong understanding of virtualization technologies and VM administration.
• Hands-on experience with server monitoring, performance tuning, troubleshooting, and incident management.
• Experience managing OS patching, upgrades, migrations, and vulnerability remediation.
• Knowledge of Active Directory, Group Policy, authentication services, and identity management concepts.
• Experience supporting backup, restore, disaster recovery, and business continuity processes.
• Familiarity with security best practices, server hardening, least-privilege principles, and compliance requirements.
• Understanding of certificates, TLS configurations, SSH key management, and secure system administration practices.
• Experience working with infrastructure monitoring and alerting tools.
• Excellent collaboration and stakeholder management skills.
• Strong analytical, troubleshooting, and problem-solving abilities.

Responsibilities

• Building, configuring, and maintaining Windows, Linux, and AIX servers, virtual machines, clusters, and related infrastructure.
• Monitoring server health, performance, and availability, proactively identifying and resolving issues.
• Executing operating system patching, kernel updates, and security remediation activities within maintenance windows.
• Investigating and resolving incidents related to server operating systems, authentication services, group policies, access controls, and application dependencies.
• Supporting Active Directory domain integrations, authentication mechanisms, and access management controls.
• Managing backup solutions, performing restore testing, and validating disaster recovery readiness.
• Tracking end-of-life operating systems, platforms, and components, and supporting upgrade and migration projects.
• Managing certificates, TLS configurations, SSH keys, and security-related settings to maintain compliance with organisational standards.
• Diagnosing and resolving performance issues across CPU, memory, storage, network, and system resources.
• Ensuring antivirus and endpoint detection tools are operating effectively and addressing identified gaps.
• Collaborating with application, network, storage, and security teams to resolve cross-functional technical issues.
• Implementing, maintaining, and optimising monitoring tools, dashboards, thresholds, and alerts to improve operational visibility.
• Participating in disaster recovery exercises, failover testing, and recovery validation activities.
• Maintaining accurate documentation, operational runbooks, system diagrams, asset records, and CMDB information.
• Producing operational metrics and KPI reporting, including system availability, patch compliance, backup success rates, incident trends, and capacity insights.
• Supporting continuous improvement initiatives, operational excellence activities, and infrastructure modernisation programmes.

Skills

Windows Server

Linux administration

AIX administration

Virtualisation

Incident management

Patch management

Active Directory

Backup & DR

Security hardening

ITIL processes

Documentation

Job description

Avon is seeking a Windows & Unix Engineer to ensure stability, security, and performance of enterprise server environments across Windows, Linux, and AIX. You will provide Level 2 support, manage virtualised environments, and collaborate with cross-functional teams to keep critical services running smoothly.

The role emphasizes patching, migrations, security remediation, and disaster recovery readiness, with strong focus on AD, backups, and incident management.