Middleware & Systems Administrator: 24/7 Enterprise Ops

Madiff; Warszawa; On-site; PLN 120,000 - 180,000; Full time

Job summary

Madiff is seeking a Middleware & Systems Administrator to join our team for a long-term engagement in a modern payments environment. You will administer enterprise middleware, transaction processing services and supporting platforms that require 24/7 reliability, focusing on system administration, optimisation and incident resolution.

Your responsibilities include deploying and maintaining WebLogic middleware and Linux application servers, tuning Oracle databases, and managing patching, releases

Qualifications

• 2–3 years of experience administering applications or databases in production environments.
• Hands-on WebLogic administration (installation, domain management, tuning).
• Working knowledge of Oracle DB and SQL query optimisation.
• Good troubleshooting skills and root-cause analysis.
• Professional attitude to operational discipline and documentation.
• English at a working level.

Responsibilities

• Deploy, configure and maintain WebLogic middleware and Linux application servers.
• Perform routine database support tasks and optimise SQL queries against Oracle databases.
• Manage application lifecycle tasks: patching, releases, configuration changes, rollback plans.
• Monitor systems, investigate alerts, troubleshoot incidents and apply fixes or escalate appropriately.
• Maintain runbooks, SOPs and technical documentation for operational procedures.
• Automate tasks using Bash/Python scripting and automation tools (Ansible, Terraform where applicable).
• Support backup, restore and disaster recovery procedures, including DR drills.
• Collaborate with developers, DBAs, network and security teams on cross-domain issues.
• Participate in on-call rota and occasional out-of-hours maintenance windows.
• Contribute to performance tuning and capacity planning.

Skills

System administration

Troubleshooting

Documentation

English proficiency

Tools

WebLogic administration

Oracle DB

Docker

Kubernetes

Ansible

Python scripting

CI/CD

Prometheus

Grafana

ELK/Elastic

ServiceNow

Job description

Madiff is seeking a Middleware & Systems Administrator to join our team for a long-term engagement in a modern payments environment. You will administer enterprise middleware, transaction processing services and supporting platforms that require 24/7 reliability, focusing on system administration, optimisation and incident resolution.

Your responsibilities include deploying and maintaining WebLogic middleware and Linux application servers, tuning Oracle databases, and managing patching, releases