System Administrator

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

We are looking for a Middleware & Systems Administrator to join our team on a long-term engagement inside a modern payments environment.

The team operates enterprise middleware, transaction processing services and supporting platforms that demand 24/7 reliability . You will focus on system administration, optimisation and incident resolution for middleware and database-backed services supporting critical financial workloads.

What you will do

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

Manage certificates, keys and basic network configurations

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

Requirements

2–3 years’ experience administering applications or databases in production environments

Hands-on experience with WebLogic administration (installation, domain management, tuning)

Working knowledge of Oracle DB and SQL query optimisation

Good troubleshooting skills, log analysis and root-cause investigation

Professional attitude to operational discipline and documentation

English at a working level

Nice to have

Exposure to Oracle DBA tasks (backups, tuning)

Familiarity with Docker/Kubernetes

Experience with Ansible, Python scripting, CI/CD for ops tasks

Exposure to Prometheus, Grafana, ELK/Elastic

Understanding of security & compliance in financial systems

Experience with ServiceNow or other ITSM tooling

• Work in multilingual, multinational and multicultural environment on international projects