Senior Linux Engineer – DC Migration Programme

Job Description We are looking for a Senior Linux Engineer to join a data centre migration programme supporting critical payment processing platforms. This role sits within the core infrastructure stream and focuses on ensuring stability, performance, and successful migration of high-availability transaction systems. The platforms support payment card acceptance, acquiring services, and issuer processing, operating in real-time environments with strict requirements around availability, security, and performance. Responsibilities Administer, configure, and maintain enterprise Linux server environments Support application platforms running on Linux infrastructure Build and prepare infrastructure environments for migration activities Monitor system performance, reliability, and availability Diagnose and resolve infrastructure issues impacting application environments Support environment setup, configuration, and access preparation for migration phases Collaborate closely with application, middleware, and infrastructure teams during migration execution Maintain operational documentation and technical knowledge in Confluence Requirements Advanced Linux system administration experience Strong experience with Red Hat Enterprise Linux or Oracle Linux Experience supporting application servers such as JBoss, Tomcat, Apache, OHS, WildFly, or Spring Boot environments Experience with automation tools such as Rundeck or Ansible Strong experience with Linux monitoring, performance analysis, and troubleshooting Scripting skills in Bash or Python Solid understanding of IP networking and infrastructure concepts Experience supporting high-availability or high-transaction systems Experience supporting infrastructure or data centre migration programmes Strong collaboration skills in international engineering environments Nice to have Understanding of cryptography concepts such as PKI and PGP Experience in payments, fintech, or financial transaction systems Exposure to large-scale enterprise transformation programmes Knowledge of load balancing, TLS, and secure infrastructure patterns Benefits Solid, competitive salary Work in a multinational environment on international projects Comprehensive healthcare Long-term B2B contract with a stable project pipeline Work model: Warsaw-based, primarily onsite with 1–2 remote days per month