Senior Application Engineer / Administrator

act digital; Den Haag; On-site; EUR 90,000 - 120,000; Full time

Job summary

act digital is seeking a Senior Application Engineer / Administrator to join its large-scale IT infrastructure team in Den Haag. You will install, configure, administer, and maintain critical business applications across production and non-production environments.

The role requires 6+ years in IT infrastructure, 5+ years in application administration, and hands-on experience with Docker, Kubernetes, and Elasticsearch. English proficiency at B2 level is expected.

Qualifications

• Minimum 6 years of experience in mid-sized or large IT infrastructure environments.
• Minimum 5 years of experience in application administration, deployment, support, and maintenance.
• Minimum 2 years of experience with microservices, container orchestration, and container-based technologies like Docker and Kubernetes.
• Minimum 2 years of experience administering and supporting Elasticsearch.
• Minimum 5 years of experience with enterprise Microsoft and/or Linux server solutions.
• English proficiency at least B2 level.

Responsibilities

• Install, configure, administer, and maintain applications in production and non-production environments.
• Monitor performance and availability; perform tuning as needed.
• Support incident, change, release, and problem management activities.
• Develop and maintain procedures, manuals, troubleshooting guides, and backup plans.
• Automate recurring system administration tasks.
• Produce installation, administration, and support documentation.
• Contribute to knowledge bases and ongoing service improvement.
• Monitor and report on availability, performance, capacity, and usage.
• Ensure continuous improvement of service efficiency, reliability, and quality.

Skills

Application administration

Automation

IT service management

Tools

Docker

Kubernetes

Elasticsearch

Job description

We are looking for an experienced Senior Application Engineer / Administrator to join a large-scale IT infrastructure environment. The successful candidate will be responsible for the installation, configuration, administration, maintenance, and continuous improvement of business‑critical applications across production and non‑production environments.

This role requires a strong background in application administration, containerized environments, Elasticsearch, enterprise server technologies, automation, and IT service management.

Your Responsibilities

• Install, configure, administer, and maintain applications in production and non-production environments.
• Monitor application performance and availability and perform performance tuning where required.
• Support application lifecycle activities, including incident, change, release, and problem management.
• Develop and maintain application procedures, operational manuals, troubleshooting guides, and backup and restore plans.
• Automate recurring system administration and operational activities.
• Produce installation, administration, and technical support documentation.
• Contribute to the development and maintenance of technical knowledge bases.
• Monitor and report on application availability, performance, capacity, and usage.
• Ensure continuous improvement of service efficiency, reliability, and quality.

Required Qualifications & Experience

• Minimum 6 years of experience working as an IT professional in mid‑sized or large IT infrastructure environments.
• Minimum 5 years of experience in application administration, deployment, support, and maintenance.
• Minimum 2 years of experience with microservices, container orchestration, and container‑based technologies, such as Docker and Kubernetes.
• Minimum 2 years of experience administering and supporting Elasticsearch.
• Minimum 5 years of experience working with enterprise Microsoft and/or Linux server solutions.
• Strong professional experience in complex enterprise IT environments.
• Working proficiency in English, minimum B2 level.
• Relevant higher education or equivalent professional experience.