As a member of the Shared Network Infrastructure (server) team you are responsible for operational and planned maintenance tasks in the Shared Network Infrastructure, SNI, supporting server services for the IONOS group.

Additionally to providing Out-of-Band and management networks, The SNI team also provides network related services on Linux servers such as TACACS, Syslog, Network Backups, and Network Monitoring to the various other network teams in IONOS.

Tasks

• Basic Linux administration and operation.
• User management.
• Validating and updating documentation.
• Basic networking tasks.

Qualifications

• Bachelor/Master in IT relevated studys.
• Knowledge of Linux.
• Basic Networking knowledge.
• Fluent in both English and German.
• Knowledge of Git & Gitlab CI.
• Interested in scripting with Python / Bash, using APIs.
• Interested in server deployment using Ansible.
• Containerization & virtualization.
• 10 - 15 hours per week.
• Able to work independently.
• Problem-solving aptitude.

In order to simplify and accelerate our application process, we would appreciate it if you could provide us with your enrollment certificate directly with your application.

Benefits

• Hybrid working model.
• Flexible working hours through trust-based working hours.
• At some locations a subsidized canteen and various free drinks.
• 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.

Our team of highly motivated experts against cyber security attacks are looking for more teammates. As a network reliability engineer you will plan and operate together with site reliability engineers and system administrators our defense platforms which protect our hosting products and infrastructure. Besides the classical DDoS Mitigation, we are also responsible for modern web application firewalls, zero trust strategies or content delivery networks (cdn). In a culture which places great value on creative ideas, agile working methods, initiative, and participation you can expect the following tasks:

Tasks

• Development and adaptation of logic for defending against DDoS attacks, especially at the network level.
• Optimization of pipelines for automatic detection and mitigation of attack patterns, as well as reporting using flow data.
• Supporting the team by providing automated operational processes and rollouts of network components for on-call availability.
• Providing interfaces for other teams for integration into the hosting products.
• Administration and troubleshooting of the router infrastructure of our defense products.
• Supporting set goals through efficient operational architecture, active lifecycle management, and streamlined processes in an agile DevOps environment.

Qualifications

You have completed a degree in computer science or a comparable professional education. Additionally, you have a strong interest in security topics, excellent networking knowledge and have the following qualifications:

• Several years of experience in operating network components and JUNOS as a Network Operating System.
• Excellent experience with the BGP routing protocol and BGP Flowspec.
• Experience with Linux-based network filtering capabilities such as Netfilter, nftables, eBPF, or XDP.
• Operation and development of highly available software artifacts in programming or scripting languages: C, Go, Python, Rust, Bash.
• Practical knowledge and use of open-source routing services such as Frrouting and GoBGP are advantageous.
• Infrastructure as Code with Ansible and automation are essential parts of your own work practices.
• Strong analytical skills to assess DDoS attacks, implement countermeasures, and continuously enhance our defense platforms.
• You are, like us, a fan of open source, particularly Linux.
• You can communicate fluently in English with your international team. German is a plus.

We are looking for someone in Berlin or Karlsruhe!

Benefits

• Hybrid working model.
• Flexible working hours through trust-based working hours.
• At some locations a subsidized canteen and various free drinks.
• 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.

Join our highly motivated team of experts dedicated to combating cyber security threats. As a Site Reliability Engineer, you will work closely with system administrators and network engineers to develop and operate our cutting-edge defense platforms. These platforms are crucial for protecting our hosting products and infrastructure, encompassing classic DDoS Mitigation, modern Web Application Firewalls (WAF), Zero Trust strategies, and our Content Delivery Network (CDN).

We foster a culture that highly values creative ideas, agile working methods, initiative, and participation.

Tasks

• Design, develop, and fine-tune our defense logic to effectively mitigate complex DDoS attacks across the network and application layers.
• Optimize and enhance current pipelines for automated threat detection, mitigation, and comprehensive reporting.
• Collaborate with system administrators to drive the automation of operational tasks and infrastructure provisioning.
• Develop and maintain robust APIs/interfaces to facilitate seamless integration of our defense capabilities into hosting products.
• Manage and troubleshoot our high-availability and complex defense infrastructure, including active participation in a rotating on-call service schedule.

Qualifications

You have a degree in Computer Science or a comparable educational background. You possess a strong interest in security topics, excellent networking knowledge, and meet the following qualifications:

• Several years of experience in system-near development of highly available, scalable software artifacts using languages such as Go, C, Python, PHP, or Bash.
• Experience in writing application logic with Lua scripting, particularly in combination with NGINX.
• Practical hands-on experience operating and configuring NGINX as a reverse proxy, load balancer, or Web Application Firewall (WAF).
• A deep commitment to Infrastructure as Code (IaC) and automation as core tenets of your engineering methodology.
• Familiarity with advanced networking concepts, including BGP, flowspec, anycast routing, and a solid understanding of network protocols within Linux systems.
• Excellent analytical skills for evaluating complex DDoS attacks, designing effective countermeasures, and continuously evolving our defense platforms.
• The ability to communicate fluently in English with an international team is required; German language is a bonus.

We are looking for someone in Berlin or Karlsruhe!

Benefits

• Hybrid working model.
• Flexible working hours through trust-based working hours.
• At some locations a subsidized canteen and various free drinks.
• 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.

As a Staff Network Solutions Architect, you will drive the technical definition, design, and architectural leadership for network architectures and services within cloud environments, driving innovative solutions that enable the organization’s strategy. You will act as the key technical expert for cloud networking within the team. This role requires collaboration with cross-functional teams—including different network teams, product development, and the wider cloud platform organization—to ensure that all proposed solutions are scalable, secure, and follow industry best practices. You will bridge the technical gap between these groups.

Tasks

• Lead the network architecture for the IONOS public cloud environment, ensuring alignment with overall Hosting infrastructure strategy.
• Collaborate with Product Owners, DevOps, SDN developers, cross-platform, and network engineering teams to define technical and product solutions, ensuring proposed solutions are feasible, scalable, and aligned with architectural standards.
• Provide technical input into product and technology roadmaps, anticipating future business and technical needs.
• Research, evaluate, design, and deploy emerging networking technologies (SDN, virtual networking, automation, security frameworks).
• Guide our stakeholders and enterprise customers, translating high level business needs into detailed technical tasks.
• Design high-level and low-level network architectures (HLD/LLD) and maintain rigorous architectural documentation.

Qualifications

• 10+ years of experience in network architecture and design, including public cloud platforms (AWS, Azure, GCP).
• Deep understanding of DC fabric architectures and implementation of the network services and VNFs on top of them.
• Strong expertise in SDN, NFV, routing, switching, firewalling, and hybrid networking.
• Proven experience leading complex network projects as both architect and technical leader.
• Design of secure, scalable, and resilient networks across public cloud environments.
• Solid experience with virtualized environments and their components (KVM, Open vSwitch, Linux bridges).
• Familiarity with automation and DevOps practices for networking (Netbox, Terraform, Ansible, CI/CD).
• Strong background in Linux systems, including Python, NFtables, IPtables, Git.
• Documentation and architecture skills (HLD, LLD, diagrams).
• Excellent communication skills, with the ability to translate complex technical concepts into clear business value for diverse stakeholders.
• High degree of resilience and adaptability, with the ability to remain effective and deliver results in fast-paced, high-pressure environments.

Languages

• English required, German preferred, Spanish bonus.

Benefits

• Hybrid working model.
• Flexible working hours through trust-based working hours.
• At some locations a subsidized canteen and various free drinks.
• 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.

Given the rise in cybercrime and large-scale DDoS attacks on the Internet, our defense services are essential for protecting IONOS and our customers. We safeguard against various Internet threats, including attacks and data theft. To achieve this, we operate a global network of scrubbing centers, providing terabit-level attack filtering capacity. Furthermore, our distributed security platforms effectively leverage our own global Internet backbone.

Tasks

Lead the future of IONOS defense portfolio — as Sr. Manager Defense Platform Services you will own the vision and roadmap of our defense services. On top of that, your responsibilities are:

• Lead an international, distributed team of highly skilled security experts and team up with network engineers and architects, information security, cloud teams, software development  and sales.
• Define and execute the strategy and roadmap for DDoS defense, Content Delivery Network (CDN), Web Application Firewall (WAF), and Intrusion Prevention System (IPS) capabilities in partnership with senior leadership.
• Create product requirements, drive strategic initiatives, and guide the team to deliver innovative solutions.
• Partner with professional services and pre-sales teams to onboard new tenants and enterprise customers and ensure successful implementation and delivery.
• Establish and own service levels and KPIs (e.g., availability targets, mean time to detect/mitigate, false-positive rates) and publish regular DDoS threat and trend reports.

Qualifications

You have studied Computer Science/Engineering or have completed comparable education. You have a keen interest in security topics and have the following qualifications:

• 5+ years of professional experience in network security as security architect, solutions architect, product management or professional services engineer.
• 2+ years of leadership experience with strong team management skills, preferably in international environments.
• Comprehensive expertise and proven hands-on experience with DDoS on-premise and cloud solutions; knowledge of web application protection, packet inspection, and hardware offloading is desirable.
• Excellent communication and presentation skills in both written and verbal, ability to interact effectively with executives, engineers, stakeholders and customers.
• Proven project management experience; understanding of key standards such as ISO 27001, BSI C5, and NIS2 preferred.
• A strategic and proactive mindset — you think ahead and act fast.

Language: English required, German is a plus

Location: Berlin or Karlsruhe

Benefits

• Hybrid working model.
• Flexible working hours through trust-based working hours.
• At some locations a subsidized canteen and various free drinks.
• 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.