Middleware Engineer

Role Summary As a Middleware Engineer, you will support the migration of critical payment processing applications from one data center to another. You will be responsible for middleware platforms that sit between the application and infrastructure layers, ensuring applications continue to operate reliably throughout planning, testing, migration, and post-migration activities. The role combines middleware administration, automation, troubleshooting, documentation, and close collaboration with project managers, infrastructure teams, and application owners. Main Responsibilities Application Migration Support migration of middleware components to new data center environments. Build, configure, test, and validate middleware services. Coordinate migration activities with project managers and technical teams. Resolve technical issues and remove blockers during migration. Middleware Administration Manage and support technologies including Oracle WebLogic, Oracle Service Bus, Oracle Forms & Reports, Oracle REST Data Services (ORDS), Oracle Internet Directory, Oracle APEX, and Oracle Data Integrator (ODI). Operations Perform BAU (Business As Usual) support alongside migration work. Monitor application performance, availability, and reliability. Troubleshoot middleware, integration, and deployment issues. Ensure production stability. Automation & Scripting Use scripting and automation tools such as Shell/Bash, PowerShell, Perl, Python, Rundeck, and Ansible. Documentation Produce and maintain technical documentation in Confluence. Document configurations, procedures, migration steps, and operational knowledge. Required Technical Skills Middleware: Oracle WebLogic 11g/12c; Oracle Service Bus; Oracle Forms; Oracle Reports; Oracle REST Data Services (ORDS); Oracle Internet Directory; Oracle APEX; Oracle Data Integrator (ODI). Database: PL/SQL; Oracle databases. Scheduling & Automation: BMC Control-M; Rundeck; Ansible. Scripting: Bash/Shell; PowerShell; Python; Perl. Infrastructure Knowledge: Networking; load balancing; TLS/SSL; high availability; performance monitoring; resilience and disaster recovery concepts. Soft Skills The employer is looking for someone who can communicate effectively in Polish and English; work with international teams and SMEs; coordinate technical activities across multiple stakeholders; take ownership of tasks and deliver on commitments; share knowledge and collaborate effectively; and understand the challenges of migrating business-critical applications. Ideal Candidate Profile A strong candidate would have experience with data center or cloud migration projects; middleware administration experience in Oracle technologies; knowledge of enterprise application architecture (three-tier architecture); experience supporting payment, banking, or other high-availability enterprise systems; strong troubleshooting and problem-solving skills; and familiarity with automation and DevOps practices.