Database Infrastructure Administrator

Dun & Bradstreet; Warszawa; On-site; PLN 180,000 - 240,000; Full time

Job summary

Dun & Bradstreet in Warsaw is seeking an experienced Database Administrator to manage a diverse database estate across Oracle, SQL Server, PostgreSQL, MySQL and MongoDB. You will ensure health, security and performance, and participate in migrations and modernization projects.

The role combines operations and project work, requires 3–5+ years of hands-on DBA experience, strong SQL skills, and familiarity with ITIL processes, service management tools, and automation using Ansible, PowerShell or

Qualifications

• 3–5+ years hands-on database administration across Oracle, SQL Server, PostgreSQL, MySQL or MongoDB.
• Strong SQL skills with experience in performance tuning, backup/recovery and high availability.
• Exposure to heterogeneous database migrations (e.g., Oracle to PostgreSQL/SQL Server).
• Comfort in virtualized environments (VMware/vSphere, GCP/GCVE/AWS) and mixed Linux/Windows hosting.
• Working knowledge of ServiceNow and/or Jira, and ITIL processes (incident, change, problem).
• Scripting and automation instincts (Ansible, PowerShell, shell, Python).
• Fluent English; other European languages welcome.

Responsibilities

• Administer, tune and support production and non-production databases across Oracle, MS SQL Server, PostgreSQL, MySQL and MongoDB.
• Handle incidents, service requests, change requests and vulnerability remediation through ServiceNow, following ITIL practice.
• Build and improve monitoring and observability using Splunk, Zabbix and OpenTelemetry-based database metrics.
• Automate routine tasks, patching and provisioning via Ansible, GitHub and NinjaOne.
• Work security-first: Imperva, Nessus, CyberArk, and alignment with ISO 27001, SOX, CIS and GDPR controls.

Skills

Database administration

SQL skills

ITIL/ServiceNow

Monitoring/observability

Scripting/automation

Virtualized environments

English fluency

Tools

Splunk

Zabbix

OpenTelemetry

Ansible

GitHub

NinjaOne

VMware/vSphere

GCP

AWS

Jira

Job description

At Dun & Bradstreet, we believe data has the power to create a better tomorrow. As a global leader in business decisioning data and analytics, we help companies worldwide grow, manage risk, and innovate. Since 1841, businesses have trusted us to turn uncertainty into opportunity. We’re a diverse, global team that values creativity, collaboration, and bold ideas. Are you ready to make an impact and help shape what’s next? Join us! Explore opportunities at dnb.com/careers.

About the role

We run one of the most diverse database estates in the business, spanning Oracle, Microsoft SQL Server, MySQL, PostgreSQL and MongoDB, hosted across multiple data centres

You’ll keep this estate healthy, secure and fast, and you’ll play a real part general migration efforts. This isn’t a “keep the lights on and nothing else” job. Half your time is operations, half is projects that actually move the needle.

What you’ll actually do

• Administer, tune and support production and non-production databases across Oracle, MS SQL Server, PostgreSQL, MySQL and MongoDB.
• Handle incidents, service requests, change requests and vulnerability remediation through ServiceNow, following ITIL practice.
• Build and improve monitoring and observability using Splunk, Zabbix and OpenTelemetry-based database metrics.
• Automate the boring stuff, patching and provisioning via Ansible, GitHub and NinjaOne.
• Work security-first: Imperva, Nessus, CyberArk, and alignment with ISO 27001, SOX, CIS and GDPR controls.

What you bring

• 3–5+ years hands-on database administration across at least two of: Oracle, SQL Server, PostgreSQL, MySQL, MongoDB.
• Solid SQL skills and real experience with performance tuning, backup/recovery and high availability.
• Exposure to heterogeneous database migrations (Oracle to PostgreSQL/SQL Server is a big plus).
• Comfort in virtualised environments (VMware/vSphere, GCP/GCVE/AWS) and mixed Linux/Windows hosting.
• Working knowledge of ServiceNow and/or Jira, and ITIL processes (incident, change, problem).
• Scripting and automation instincts (Ansible, PowerShell, shell, Python).
• Fluent English; other European languages welcome.
• An ownership mindset, curious, proactive, and a genuine team player.

Nice to have

• Certifications in Oracle, Microsoft SQL Server or PostgreSQL.
• Experience with observability tooling (like Splunk & Zabbix).