Database Engineer

Randstad A/S; Frederiksberg, København; On-site; DKK 600,000 - 800,000; Full time

Job summary

PSQR in Frederiksberg seeks a Database Engineer responsible for designing and operating our traceability solutions. The role requires collaboration with development teams and managing the database layer, particularly with Cassandra, ElasticSearch, and MySQL.

Qualified candidates should have strong DevOps skills, experience in high-performance environments, and familiarity with Infrastructure as Code tools. This position involves on-premise installations worldwide.

Qualifications

• Experience designing, scaling, tuning, and operating Cassandra clusters.
• Proficient in MySQL/MariaDB and other SQL technologies.
• Strong knowledge of Linux Administration (Ubuntu, CentOS/RHEL).
• Experience with ElasticSearch, RabbitMQ, Docker, and Zookeeper.
• Knowledge of HA, failover, and disaster recovery strategies.

Responsibilities

• Full ownership of Cassandra operations, including scaling and performance tuning.
• Translating customer requirements into architectural configurations.
• Automate infrastructure setup and configuration using IaC tools.
• Provide Linux system administration including performance tuning.

Skills

Cassandra scaling and operation

MySQL/MariaDB

Linux Administration

ElasticSearch

DevOps Mindset

Infrastructure as Code (IaC)

Tools

Terraform

Ansible

RabbitMQ

Docker

Kubernetes

Job description

The job

As a Database Engineer at PSQR, you will design, build, operate, and automate the underlying platform for our traceability solutions, ensuring high performance, stability, and international scalability. This proactive DevOps role involves close collaboration with development teams to identify and resolve bottlenecks across the network stack, Kubernetes, and especially the database layer (Cassandra, Elastic Search, RabbitMQ, MySQL, and ZooKeeper). The role involves travel for on-premise system installations at customer sites worldwide.

Main responsibilities

• Full ownership of Cassandra/ScyllaDB operations, including scaling, performance tuning, and schema design.
• Translating customer requirements into architectural configurations.
• Operate the production platform, including deployment, patching, monitoring, alerting, and incident response.
• Manage, operate, and troubleshoot RabbitMQ and manage/scale ElasticSearch clusters.
• Identify and resolve performance bottlenecks across the stack.
• Design and implement high availability, failover, and backup/restore strategies.
• Automate infrastructure setup and configuration using Infrastructure as Code (IaC) tools like Terraform and Ansible.
• Provide Linux system administration, including performance tuning and troubleshooting.

Qualifications and competencies

• Designing, scaling, tuning, and operating Cassandra clusters in high-performance environments.
• MySQL/MariaDB/other SQL technologies.
• Linux Administration: Ubuntu, CentOS/RHEL.
• ElasticSearch, RabbitMQ, Docker, Zookeeper.
• Strong DevOps Mindset, knowledge of HA, failover, disaster recovery strategies, and understanding of how Java and React components interact with the platform.
• Experience with Infrastructure as Code (IaC) tools like Terraform and/or Ansible, familiar with Kubernetes and/or Proxmox, and cloud platforms such as GCP, AWS, and Azure.
• Background in SaaS environments, proactive, solution-oriented, and a team player.