System Administrator

5V Tech; Brussel Hoofdstad; On-site; EUR 65,000 - 90,000; Full time

Job summary

5V Tech is seeking an experienced System Administrator with a strong database background to Brussels-based technical team. You will manage a mixed estate of on-premises and Azure-hosted databases, ensuring security, resilience, and performance.

This hands-on role also covers Windows and Azure administration and serves as a technical contact for application owners. You’ll administer Oracle, MS SQL Server and PostgreSQL, drive infrastructure evolution, implement hardening, and automate operations.

Qualifications

• Experience administering Oracle, MS SQL Server and PostgreSQL across on-premises and cloud environments.
• Knowledge of performance tuning, monitoring, backup and recovery, capacity management and high-availability practices.
• Hands-on experience managing database infrastructure in Microsoft Azure, with automation and scripting using PowerShell, SQL or similar.
• Understanding of database hardening, privilege management, vulnerability remediation, security auditing and log analysis.
• Experience with Windows Server, IIS, Active Directory/Entra ID, Azure DevOps pipelines and certificate management.
• Excellent written and spoken English.

Responsibilities

• Administering and operating Oracle and MS SQL (on-premises) and PostgreSQL (Azure) databases, including installation, patching, performance tuning, backup and recovery, monitoring, listener configuration, tablespaces and user management.
• Driving the evolution of database infrastructure, architecture and hosting platforms, including system hardening, access control and auditing.
• Managing database security and compliance by identifying and fixing vulnerabilities and analyzing security audits and logs.
• Automating and scripting routine operations to improve efficiency and reliability.
• Supporting application owners and database users with day-to-day queries and issues.
• Producing clear technical documentation, reports and presentations.
• Contributing to broader systems administration, including Windows Server/IIS, Active Directory/Entra ID, Azure DevOps pipelines, certificate renewals and general troubleshooting.

Skills

Oracle

MS SQL Server

PostgreSQL

Performance tuning

Backup and recovery

High availability

PowerShell

Azure DevOps

SQL scripting

Windows Server

IIS

Entra ID

Documentation

English

Tools

Windows Server

IIS

Active Directory/Entra ID

Azure DevOps pipelines

Certificate management

Job description

Ready to take ownership of a complex, mixed database estate where your expertise really counts?

An exciting opportunity has opened for an experienced System Administrator with a strong database background to join a growing Brussels-based technical team.

You’ll look after a mixed estate of on-premises and Azure-hosted databases. You’ll keep them secure, resilient and performing well, and help shape how the infrastructure evolves. It’s a hands‑on role with real variety. Alongside core DBA work, you’ll support wider Windows and Azure administration and act as a trusted technical point of contact for application owners.

What You’ll Be Doing

• Administering and operating Oracle and MS SQL (on-premises) and PostgreSQL (Azure) databases, covering installation, patching, performance tuning, backup and recovery, monitoring, listener configuration, tablespaces and user management.
• Driving the evolution of database infrastructure, architecture and hosting platforms, including system hardening, access control and auditing.
• Managing database security and compliance by finding and fixing vulnerabilities and analysing security audits and logs.
• Automating and scripting routine operations to improve efficiency and reliability.
• Supporting application owners and database users with day‑to‑day queries and issues.
• Producing clear technical documentation, reports and presentations.
• Contributing to broader systems administration, including Windows Server/IIS, Active Directory/Entra ID, Azure DevOps pipelines, certificate renewals and general troubleshooting.

What You’ll Bring

• Proven experience administering Oracle, Microsoft SQL Server and PostgreSQL across on‑premises and cloud environments, including installation, configuration, patching, upgrades and maintenance.
• Strong knowledge of performance tuning, monitoring, backup and recovery, capacity management and high‑availability practices.
• Hands‑on experience managing database infrastructure in Microsoft Azure, with automation and scripting skills in PowerShell, SQL or similar.
• A solid understanding of database hardening, privilege management, vulnerability remediation, security auditing and log analysis.
• Experience with Windows Server, IIS, Active Directory/Entra ID, Azure DevOps pipelines and certificate management.
• Confident communication skills, including the ability to write clear documentation and present to stakeholders.
• Excellent written and spoken English.