# Senior Platform Engineer (Defence & Security) at Reaktor

Reaktor is hiring a Senior Platform Engineer (Defence & Security) in Helsinki, Finland. Level rates it Little AI ●○○○; you can [apply on Reaktor](https://jobsbylevel.com/go/15f65d95-d94d-4ea3-a70f-c173951e72c6?utm_medium=ai-agent).

AI Level 1, AI centrality 34 out of 100. Helsinki.

## Details

- Company: [Reaktor](https://jobsbylevel.com/companies/reaktor)
- AI level: AI Level 1 (score 34 out of 100)
- Location: Helsinki
- Posted: October 1, 2026
- Apply: https://jobsbylevel.com/go/15f65d95-d94d-4ea3-a70f-c173951e72c6?utm_medium=ai-agent
- Free CV review for this job: https://jobsbylevel.com/cv-review?job=senior-platform-engineer-defence-security-at-reaktor-3be056

## Description

Reaktor’s tech community is looking for a Senior Platform Engineer to join our Defence & Security Business Unit in Helsinki. Our Defence & Security Unit brings together around 70 professionals working on technically demanding and societally meaningful projects. Here, you can take ownership of important technical decisions and build systems whose reliability and security genuinely matter. We are looking for someone who enjoys designing and building large-scale on-premise and private cloud platforms. If you love working hands-on with IaC, CI/CD, security, and observability to solve complex infrastructure challenges alongside product teams and clients, you might be a great fit Your role is to turn complex, security-critical infrastructure into a reliable platform that development teams can build on. You will design, build and operate on-premise infrastructure and private cloud platforms that support critical products and our clients’ business needs. You will be part of both a consulting team working closely with the client and a productisation team bringing solutions to international markets. The role combines hands-on engineering, collaboration and technical decision-making. Your daily tasks include: Designing, implementing and maintaining modern on-premise and private cloud environments, including GPU-enabled infrastructure for AI workloads, to help product teams deliver high-quality solutions. Making sure security, isolation, and compliance are built into everything you create. Enabling scalable and resilient infrastructure that can grow with demand and keep the digital services running reliably on physical hardware and virtualization layers. Automating as many routine tasks as possible to free up engineers time to focus on higher-value work. Promoting standardization through common tools, processes and configurations to reduce complexity, improve maintainability, and accelerate development cycles. Acting as a trusted advisor by working closely with product teams and other stakeholders to understand the requirements and provide the infrastructure support they need. You enjoy turning complex, fragmented infrastructure into streamlined, scalable platforms that let teams move quickly and reliably. What we are looking for: Hands-on experience in platform/infra/DevOps roles. We don’t have a hard limit on years of experience, but we’ve noticed that these competencies often take 8+ years to accumulate. Deep expertise in on-premise and/or bare-metal infrastructure, including virtualization platforms (e.g., VMware vSphere, KVM, OpenStack), physical hardware, and hardware-level monitoring. Solid infrastructure automation skills combining IaC/configuration management tools (e.g., Terraform, Ansible, SaltStack, Puppet) with hands-on scripting/programming (e.g., Python, Bash, PowerShell) for private clouds and bare-metal. Strong understanding of container orchestration (e.g., Kubernetes, OpenShift) and modern application architectures, with the ability to read and reason about application code to debug platform-level issues. Experience with enterprise networking, firewalls, IAM, and implementing strict security best practices in air-gapped or highly regulated environments following industry standards and compliance. Fluency in both Finnish and English (written & spoken). Willingness to work 100% onsite. This position requires Finnish citizenship due to client and security regulations. The selected candidate must successfully complete a security clearance process. Nice-to-have skills: Strong CI/CD experience (e.g. GitLab CI, Jenkins, GitHub Enterprise Server or similar). Practical experience with self-hosted observability stacks (e.g. Prometheus, Grafana, ELK/Opensearch). Practical skills in Backend development. Experience in partnering closely with clients/ business stakeholders. Why join us? For two decades, we’ve been developing qualities and capabilities for adapting, reacting, and supporting change – building Reaktor to hold up in a

The description is cut here. Read the full offer: https://jobsbylevel.com/jobs/senior-platform-engineer-defence-security-at-reaktor-3be056

Source: https://jobsbylevel.com/jobs/senior-platform-engineer-defence-security-at-reaktor-3be056

## Cite this page

Level. https://jobsbylevel.com/jobs/senior-platform-engineer-defence-security-at-reaktor-3be056.

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