Senior Linux Systems Engineer - Data Center Migration and Payment Processing

Unleash innovation in data center migration — shape the future of critical payment processing systems! Warszawa-based opportunity with on-site work. As a Senior Linux Systems Engineer, you will be working for our client, a leading financial technology provider, supporting critical application migrations and payment systems. You will play a pivotal role in ensuring high availability, security, and performance across complex Linux environments, contributing to innovative infrastructure transformation projects. Your main responsibilities: Administer, configure, and maintain Linux server environments (RedHat, Oracle Linux) supporting payment and issuer processing applications.Automate infrastructure deployment and management using tools like Rundeck and Ansible.Diagnose, monitor, and enhance system performance, ensuring optimal uptime and security.Collaborate closely with Application & Middleware teams for BAU tasks, migration planning, and environment setup.Resolve technical challenges rapidly and document procedures effectively using Confluence.Work alongside project managers to build, test, and execute data center migration activities.Implement cryptography solutions (PKI, PGP) and manage IP network configurations.Support incident resolution, ensuring business-critical systems remain resilient and reliable. You’re ideal for this role if you have: At least 5 years of experience in Linux system administration, preferably in payment or high-transaction environments.Strong skills in Linux (RedHat, Oracle Linux) and application servers such as JBoss, Tomcat, Apache, OHS, WildFly, Spring Boot.Hands-on experience with automation tools like Ansible and Rundeck.Knowledge of cryptography (PKI, PGP) and IP network management.Bash or Python scripting proficiency.Ability to quickly grasp complex infrastructure knowledge.Analytical mindset with problem-solving capabilities.Fluent Polish and English language skills, both written and spoken. It is a strong plus if you have: Current RHCE certification. Language Required for the role: Fluent Polish and English, both written and spoken. Eligibility to work on this role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.