Senior Platform Engineer (Defence & Security)

About the role

Reaktor is seeking a Senior Platform Engineer for its Defence & Security Business Unit in Helsinki. You will design, build and operate on‑premise and private‑cloud platforms that support critical products and client needs, working both as a consultant and productisation engineer.

Key responsibilities

• Design, implement and maintain modern on‑premise and private‑cloud environments, including GPU‑enabled infrastructure for AI workloads.
• Ensure security, isolation and compliance are built into all platforms.
• Automate routine tasks to free engineers for higher‑value work.
• Promote standardisation through common tools, processes and configurations.
• Act as a trusted advisor to product teams and support sales and proposal work as an infrastructure expert.

Required profile

• 8+ years of hands‑on platform/infra/DevOps experience.
• Deep expertise in on‑premise infrastructure, virtualization (VMware vSphere, KVM, OpenStack), networking, firewalls, IAM and hardware monitoring.
• Fluency in Finnish and English, both written and spoken.
• Willingness to work 100% on‑site and Finnish citizenship for security clearance.

Required skills

• IaC/configuration tools: Terraform, Ansible, SaltStack, Puppet.
• Scripting/automation: Python, Bash, PowerShell.
• Container orchestration: Kubernetes, OpenShift.
• CI/CD: GitLab CI, Jenkins, GitHub Enterprise Server.
• Observability stacks: Prometheus, Grafana, ELK/Opensearch.

What we offer

• Freedom to choose technologies and methodologies with clients.
• Supportive community and experienced team.
• Work‑life balance benefits (moving day, car share, child‑care services, event spaces).
• Professional growth through internal training and tech events.
• Diverse hobby clubs and inclusive culture.