I

IONOS

Cyber Security Engineer - Infrastructure & AI Platform Security

Security Engineering & ArchitectureConfirmed live in the last 24 hours
Full-timeBerlin, GermanyNo salary listed

About the Job

Requirements

  • Several years of hands-on experience in infrastructure or platform security, ideally at a hosting provider, cloud provider, telecommunications company, or similarly large multi-tenant environment.
  • Deep practical knowledge of Linux, virtualization and container platforms, networks, and the security properties of multi-tenant infrastructure.
  • Strong background in identity and access management, including privileged access, machine and workload identities, secrets management, authorization models, and infrastructure-as-code security.
  • Experience developing and enforcing security standards in heterogeneous, partly legacy environments and gaining acceptance from teams outside one's reporting line.
  • Practical knowledge of building and operating large language model and agent systems, including risks from prompt injection through untrusted data, overly broad tool access, retrieval-based data exposure, unlogged autonomous actions, and model and provider dependencies.
  • Ability to make and defend risk-based decisions, including blocking deployments with clear reasoning, and explain technical risk to non-technical stakeholders.
  • Fluent English; German is strongly advantageous because of the regulatory environment and public-sector work.

Responsibilities

  • Define and maintain security architecture standards and hardening baselines for provider-side infrastructure, including virtualization and container platforms, control planes and provisioning systems, DNS, mail infrastructure, and backup and recovery systems.
  • Assess and strengthen tenant isolation across shared-hosting, virtualization, and container layers, and drive remediation with the responsible platform teams.
  • Review infrastructure designs and significant changes for security impact, and serve as an escalation point for infrastructure security questions from platform, cloud, and brand engineering teams.
  • Reduce blast radius on critical paths, including privileged access to customer-facing infrastructure, administrative segmentation, secrets handling, and recovery integrity; translate these controls into actionable, brand-specific implementation plans for heterogeneous platforms.
  • Support Cyber Defense, Vulnerability Management, and IT emergency management with infrastructure expertise during incidents and follow-up hardening.
  • Own security architecture and baseline standards for internally operated AI platforms, including model gateways and self-hosted models, agent frameworks, assistant integrations, connectors, and retrieval pipelines over internal data.
  • Define and enforce how agents are identified, authenticated, and authorized, including non-human identity handling, credential and token management, least-privilege access to tools and systems, and when autonomous action requires human oversight.
  • Determine which data internal AI systems may access and index, and ensure agent activity is logged, attributable, and auditable in line with regulatory obligations and certifications.
  • Conduct pre-deployment security reviews for new internal AI platforms and agent use cases, and monitor unsanctioned AI use (Shadow AI).
  • Advise security functions and internal engineering teams on safe AI adoption, including guardrails that enable responsible deployment.

Desired Qualifications

  • Practical experience deploying or securing internal AI platforms, agent frameworks, or tool-calling integrations in production.
  • Familiarity with NIS2, BSIG, or ISO 27001.
  • Background in DNS, email infrastructure, or platform-adjacent abuse prevention.
  • Experience in a multi-brand or post-acquisition environment where the same control must be implemented across different systems.
  • Background in security engineering or software development, including automation, tooling, or scripting.

About the Company

Company size
1,001-5,000
Company stage
IPO
Headquarters
Montabaur, Germany
Founded
1988

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