Unix/Linux Administrator (Linux/RHEL/AIX)

Unix/Linux Administrator (Linux / RHEL / AIX)📍 Location: Warsaw, Poland🏠 Work model: Hybrid – approximately 3–4 days per month in the Warsaw office💼 Employment type: B2B📅 Assignment: 01.08.2026 – 31.12.2026, with possibility for extension, long term project 🗣 Languages: Polish (Native), English (Advanced)

About the role

For our Client from the banking sector, we are looking for an experienced Unix/Linux Administrator to join the Infrastructure Operations team.

In this role, you will be responsible for administering and maintaining enterprise Linux and Unix environments supporting critical banking systems. You will ensure high availability, system performance, security, and operational stability while working closely with infrastructure and application teams.

This is an excellent opportunity to join a large enterprise environment with modern infrastructure and participate in the maintenance and continuous improvement of mission-critical systems.

Your responsibilities

Administer, configure and maintain Linux/Unix environments (RHEL, AIX).

Ensure high availability, performance and security of server infrastructure.

Perform system monitoring, troubleshooting and incident resolution.

Manage operating system patching and patch management activities.

Configure and maintain virtualization environments.

Automate administrative tasks using Shell scripting.

Support IP-based network services and troubleshoot connectivity issues.

Collaborate with infrastructure, application and security teams.

Participate in system upgrades, maintenance windows and infrastructure improvements.

Prepare and maintain technical documentation and operational procedures.

Must have

Minimum 3 years of commercial experience as a Linux/Unix Administrator in enterprise environments (1000+ users).

Very good knowledge of Linux (RHEL) and Unix (AIX) administration.

Experience with high-availability enterprise server environments.

Practical experience with virtualization technologies.

Good Shell scripting skills.

Experience with operating system patch management.

Good understanding of TCP/IP networking.

Experience in troubleshooting Linux/Unix infrastructure issues.

Native Polish and advanced English.

Nice to haveRed Hat, IBM AIX or other Unix/Linux certifications.

Experience in the banking or financial sector.

Knowledge of enterprise monitoring solutions.

Experience with infrastructure automation.

Higher education in Computer Science, IT or related technical field.

We are looking for someone who

Works independently and takes ownership of assigned tasks.

Has strong analytical and troubleshooting skills.

Communicates effectively with both technical and business teams.

Enjoys working in complex enterprise environments.

Is proactive, detail-oriented and focused on delivering stable, secure infrastructure.

What we offer

Long-term B2B cooperation.

Hybrid work model with only 3–4 office days per month.

Opportunity to work on enterprise-scale banking infrastructure.

International and collaborative working environment.

Private medical care.

Life insurance.

Multisport card.

Team-building and integration events.