Cyber Security Engineer (f/m/d) Infrastructure & AI Platform Security

About the Position

Cyber Security Engineer (f/m/d) Infrastructure & AI Platform Security

Join IONOS, Europe's leading hosting provider and a pioneer in independent cloud solutions, as we build next-generation infrastructure. We are seeking a Cyber Security Engineer to focus on Infrastructure & AI Platform Security in Berlin, Germany.

Responsibilities

• Define and maintain security architecture standards and hardening baselines for provider-side infrastructure.
• Assess and strengthen tenant isolation across shared hosting, virtualization, and container layers.
• Review infrastructure designs and major changes for security impact.
• Reduce blast radius on the paths that matter most: privileged access, administrative segmentation, secrets handling, and recovery integrity.
• Support Cyber Defense, Vulnerability Management, and IT Emergency Management with infrastructure expertise.
• Own the security architecture and baseline standards for the AI platforms we run internally.
• Define and enforce how agents are identified, authenticated, and authorized.
• Establish what data internal AI systems may access and index, ensuring agent activity is logged and reviewable.
• Run pre-deployment security reviews for new internal AI platforms and agent use cases.
• Advise security functions and internal engineering teams on adopting AI safely.

Requirements

• Several years of hands-on experience in infrastructure or platform security.
• Deep practical knowledge of Linux, virtualization and container platforms, networking, and the security properties of multi-tenant infrastructure.
• Strong background in identity and access: privileged access, machine and workload identity, secrets management, authorization models, and infrastructure-as-code security.
• Experience designing and enforcing security standards in a heterogeneous, partly legacy landscape.
• Working knowledge of how LLM and agent systems are built and operated, and of the risks specific to them.
• Ability to make and defend risk-based decisions and explain technical risk to non-technical stakeholders.
• Fluent English; German is a strong advantage.

Nice to Have

• Hands-on 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 abuse-adjacent platform security.
• Experience in a multi-brand or post-acquisition environment.
• Security engineering or development background (automation, tooling, scripting).

We Offer

• Hybrid working model.
• Flexible working hours through trust-based working hours.
• Subsidized canteen and various free drinks at some locations.
• Modern office space with very good transport connections.
• Various employee discounts for activities and products.
• Employee events such as summer and winter parties, as well as workshops.
• Numerous training and development opportunities.
• Various health offers, such as sports and health courses.

About the Company

At IONOS, we shape the digital future for more than 6.2 million customers worldwide with our solutions. We are building next-generation infrastructure – from sovereign cloud architectures and high-performance GPU clusters to integrated AI automation tools. We work in agile teams, rely on transparent structures, and believe that excellence and innovation only emerge through true team spirit.

Ready for your next step? Become part of IONOS and grow with us.

Application Note

We value diversity and welcome all applications – regardless of, for example, gender, nationality, ethnic or social origin, religion, disability, age, as well as sexual orientation and identity, physical characteristics, marital status, or any other irrelevant factor subject to applicable law.