Database Administrator (Oracle, MS SQL & Azure Postgre SQL)

NISH Technologies; Brussel Hoofdstad; Hybrid; EUR 90,000 - 120,000; Full time

Job summary

NISH Tech BV is seeking an experienced Database Administrator to manage on‑premises and cloud databases (Oracle, SQL Server, Azure PostgreSQL). The role emphasizes availability, performance tuning, security hardening and cross‑platform operations in a hybrid Brussels setting.

You will support Windows Server, IIS, Active Directory/Entra ID and Azure DevOps deployment pipelines while advancing database infrastructure and auditing capabilities. Extensive 10+ years of experience is required.

Qualifications

• Database administration and operations.
• Oracle Database administration.
• Microsoft SQL Server administration.
• PostgreSQL administration in Microsoft Azure.
• Database installation, configuration and patching.
• Database performance monitoring and tuning.
• Backup and recovery management.
• Listener configuration, tablespace management and user administration.
• Automation and scripting for database operations.
• Database security, system hardening, access control and auditing.
• Vulnerability identification and remediation.
• Technical documentation and operational troubleshooting.

Responsibilities

• Administer and operate on-premises Oracle and Microsoft SQL Server databases and Azure-hosted PostgreSQL databases.
• Perform database installation, configuration, patching and routine maintenance.
• Monitor database availability, health and performance, and conduct performance tuning.
• Manage database backup, recovery and restoration procedures.
• Configure and maintain database listeners, tablespaces and user accounts.
• Automate database administration tasks through scripting and automation.
• Evolve and maintain database infrastructure, architectures and hosting platforms.
• Implement system hardening, user access controls and database auditing.
• Identify database security vulnerabilities and coordinate remediation activities.
• Analyse security audit findings, database logs and operational events.
• Provide technical support to application owners and database users.
• Prepare high-quality technical documentation, reports and client presentations.
• Support Windows Server and IIS administration activities.
• Administer or support Active Directory and Microsoft Entra ID.
• Contribute to Azure DevOps deployment pipelines, certificate renewals and operational troubleshooting.

Skills

Database administration

Oracle Database administration

Microsoft SQL Server administration

PostgreSQL administration

Automation and scripting

Performance tuning

Backup and recovery

Security hardening

Auditing and access control

Documentation and troubleshooting

Windows Server & IIS

Active Directory / Entra ID

Azure DevOps pipelines

Tools

Windows Server

IIS

Active Directory

Microsoft Entra ID

Azure DevOps

Job description

About the Role

NISH Tech BV is looking for an experienced Database Administrator to manage, maintain and evolve on-premises and cloud-based database environments. The role focuses on the administration and operation of Oracle and Microsoft SQL Server databases, alongside PostgreSQL databases hosted on Microsoft Azure. You will ensure database availability, performance, security and compliance through proactive monitoring, patching, performance tuning, backup and recovery, and infrastructure maintenance.

Working closely with application owners and database users, you will provide technical support, resolve operational issues and contribute to the continuous improvement of database architectures and hosting platforms. The role also involves security hardening, vulnerability remediation, access management and auditing, alongside broader systems administration activities covering Windows servers, IIS, Active Directory/Entra ID and Azure DevOps deployment pipelines.

Key Responsibilities

• Administer and operate on-premises Oracle and Microsoft SQL Server databases and Azure-hosted PostgreSQL databases.
• Perform database installation, configuration, patching and routine maintenance.
• Monitor database availability, health and performance, and conduct performance tuning.
• Manage database backup, recovery and restoration procedures.
• Configure and maintain database listeners, tablespaces and user accounts.
• Automate database administration tasks through scripting and automation.
• Evolve and maintain database infrastructure, architectures and hosting platforms.
• Implement system hardening, user access controls and database auditing.
• Identify database security vulnerabilities and coordinate remediation activities.
• Analyse security audit findings, database logs and operational events.
• Provide technical support to application owners and database users.
• Prepare high-quality technical documentation, reports and client presentations.
• Support Windows Server and IIS administration activities.
• Administer or support Active Directory and Microsoft Entra ID.
• Contribute to Azure DevOps deployment pipelines, certificate renewals and operational troubleshooting.

Required Skills

Mandatory Skills

• Database administration and operations.
• Oracle Database administration.
• Microsoft SQL Server administration.
• PostgreSQL administration in Microsoft Azure.
• Database installation, configuration and patching.
• Database performance monitoring and tuning.
• Backup and recovery management.
• Listener configuration, tablespace management and user administration.
• Automation and scripting for database operations.
• Database security, system hardening, access control and auditing.
• Vulnerability identification and remediation.
• Technical documentation and operational troubleshooting.

Nice-to-Have Skills

• Windows Server administration.
• IIS administration.
• Active Directory and Microsoft Entra ID.
• Azure DevOps deployment pipelines.
• Certificate renewals and related operational activities.

Experience

At least 10 years of relevant professional experience in database administration across on-premises Oracle and Microsoft SQL Server environments and Azure-hosted PostgreSQL databases is required.

Location & Work Model

Location: Brussels, Belgium

Work Model: Hybrid

About NISH Tech BV

NISH Tech BV is a technology and recruitment partner connecting skilled IT professionals with challenging projects across Belgium and Europe. We focus on creating strong matches between professionals and organizations through technical expertise, market knowledge and a personal approach. Our goal is to build long-term professional partnerships through quality, transparency and reliable recruitment support.