Senior Linux Engineer - Data Centre Migration Project

About the project

We are looking for an experienced Senior Linux Engineer to join a large-scale Data Center Migration program.

The project involves migration of business-critical applications supporting payment card acceptance/acquiring and issuer processing. The Linux platform hosts systems responsible for key business functions, including transaction authorization and high-volume transaction processing.

Due to the critical nature of the environment, the role requires strong expertise in Linux administration, infrastructure reliability, performance, security and High Availability.

Your responsibilities

• Administration, configuration and maintenance of enterprise Linux server environments.
• Supporting the migration of applications and infrastructure between data centers.
• Preparing Linux environments for application deployment, testing and migration.
• Building and configuring infrastructure required for new environments.
• Supporting application servers and middleware, including JBoss, Tomcat, Apache, OHS, WildFly and Spring Boot environments.
• Automating infrastructure and operational activities using Ansible and Rundeck.
• Diagnosing and resolving complex Linux, infrastructure and application-related issues.
• Performing Linux system performance analysis, monitoring and troubleshooting.
• Ensuring high availability, performance, reliability and security of production environments.
• Supporting infrastructure activities related to networking, load balancing and TLS.
• Working with security mechanisms including PKI and PGP.
• Creating automation and operational scripts using Bash and/or Python.
• Monitoring environments and proactively addressing performance and reliability issues.
• Cooperating closely with Application, Middleware, Network and Infrastructure teams.
• Working with Project Managers throughout the build, testing, migration and cutover phases.
• Identifying and resolving technical blockers during the migration.
• Creating and maintaining high-quality technical documentation in Confluence.
• Supporting BAU activities alongside migration-related tasks.

Requirements

• 5+ years of professional experience in Linux administration / Linux engineering, preferably in enterprise production environments.
• Advanced hands-on knowledge of Red Hat Enterprise Linux (RHEL) and/or Oracle Linux.
• Strong Linux system administration, configuration and troubleshooting skills.
• Experience with application or Data Center migration projects.
• Experience supporting enterprise application servers such as JBoss, Tomcat, Apache, OHS or WildFly.
• Practical experience with Ansible and/or Rundeck.
• Good scripting skills in Bash and/or Python.
• Strong understanding of IP networking and infrastructure dependencies.
• Knowledge of PKI, certificates, TLS and PGP.
• Experience with Linux performance monitoring, diagnostics and incident resolution.
• Understanding of High Availability, scalability, resilience and disaster/recovery considerations.
• Understanding of infrastructure components including networking and load balancing.
• Experience supporting critical production environments.
• Strong analytical and troubleshooting skills.
• Ability to quickly understand complex infrastructure environments.
• Very good communication and collaboration skills.
• Good written and spoken Polish and English.

Nice to have

• Current RHCE certification.
• Previous experience with Data Center-to-Data Center migrations.
• Experience in payments, banking or financial services.
• Knowledge of payment card processing, acquiring, issuing or transaction authorization environments.
• Experience supporting near-real-time and high-volume transaction processing systems.
• Experience working in international, cross-functional infrastructure teams.

What we offer

• Long-term B2B cooperation.
• Participation in a strategic Data Center Migration program.
• Work with large-scale, business-critical Linux environments.
• Exposure to systems supporting high-volume payment processing and transaction authorization.
• Cooperation with experienced Application, Middleware, Infrastructure and Network specialists.
• Technically challenging environment with a strong focus on availability, performance, resilience and security.