Senior Database & Infra Systems Administrator

Alsena; Brussel Hoofdstad; On-site; EUR 70,000 - 110,000; Full time

Job summary

Alsena is seeking an experienced System Administrator (Database Focus) to join an IT infrastructure project in Brussels. The role combines database administration with broader IT infrastructure responsibilities, ensuring availability, security and performance of enterprise databases in a complex international environment.

The ideal candidate will have hands‑on experience with Oracle, Microsoft SQL Server and PostgreSQL, plus on‑prem and Azure cloud environments.

Qualifications

• Masters or Bachelors in CS/IT with 8+ years of relevant experience.
• Proven database administration across Oracle, SQL Server and PostgreSQL.
• Experience in on‑prem and Azure cloud environments.
• Strong security, backup/recovery and DR procedures.
• Excellent documentation and communication in English.

Responsibilities

• Administer, tune and secure Oracle, SQL Server and PostgreSQL databases.
• Manage connectivity, listeners, tablespaces, users and access control.
• Ensure high availability, monitoring, backups and disaster recovery.
• Automate admin tasks with scripts (PowerShell, SQL).
• Collaborate with Windows Server, IIS, AD, Entra ID and Azure DevOps.
• Prepare technical docs and operational reports.

Skills

Oracle

SQL Server

PostgreSQL

Azure

PowerShell

Windows Server

IIS

Active Directory

Education

Master's degree in Computer Science / IT

Bachelor's degree in Computer Science / IT

Tools

Azure Cloud

SQL Server Management Studio

Oracle SQL Developer

Monitoring tools

Job description

Alsena is seeking an experienced System Administrator (Database Focus) to join an IT infrastructure project in Brussels. The role combines database administration with broader IT infrastructure responsibilities, ensuring availability, security and performance of enterprise databases in a complex international environment.

The ideal candidate will have hands‑on experience with Oracle, Microsoft SQL Server and PostgreSQL, plus on‑prem and Azure cloud environments.