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Linux Systems Engineer in Domains Retail Operations team (hybrid)

IONOS ENCalea Floreasca 246c, 014476 BucharestPosted 25 Oct 2026

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About this role

About IONOS At IONOS, we don't just manage servers – we shape the digital future for more than 6.2 million customers worldwide with our solutions. As Europe's leading hosting provider and a pioneer in independent cloud solutions, we are building next-generation infrastructure – from sovereign cloud architectures and high-performance GPU clusters to integrated AI automation tools. What drives us is digital sovereignty for Europe and real impact for small and medium-sized businesses (SMBs) as well as large enterprises.

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. At IONOS, we don't just manage servers – we shape the digital future for more than 6.2 million customers worldwide with our solutions. As Europe's leading hosting provider and a pioneer in independent cloud solutions, we are building next-generation infrastructure – from sovereign cloud architectures and high-performance GPU clusters to integrated AI automation tools.

What drives us is digital sovereignty for Europe and real impact for small and medium-sized businesses (SMBs) as well as large enterprises. 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. About the team We are the infrastructure team behind three of the group’s major products: Domains, DNS, and SSL.

Together we run and look after around 700 servers, the platform that keeps these services available, secure, and performing for customers every day. Because these products sit at the core of the internet infrastructure our customers rely on, reliability and uptime are at the center of everything we do. The team has 4 Linux systems engineers, a mix of senior and mid-level colleagues, who share ownership of provisioning, configuration management, and monitoring.

Everyone takes part in the on-call rotation, and knowledge is shared so that no single person is a bottleneck. About the product The new colleague will contribute to the platform behind three of the group’s core products : Domains, DNS, and SSL. The three products are closely connected, they share infrastructure, tooling, and operational practices. These are mature, actively maintained products operating at scale. The focus is on keeping them reliable and performant while continuing to grow capacity, modernize the stack, and improve automation.

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Main responsibilities: Work together with development teams, system operators and operate web applications; Configure, maintain and enhance applications running on the controlled environments; Implement and maintain automated scripts for deployment and monitoring of applications; Set-up tools for assisting and optimizing daily activity; React in real-time in case of failures of applications (on-call required); Shape the future of the product by reporting bugs and feature requests.

We are looking for some of: Proven experience (4+ years) administering Linux servers in production, preferably Debian; Availability to participate in an on-call rotation; Strong command-line, shell scripting, and troubleshooting skills (Bash, Python); Hands-on experience with configuration management using Puppet; Solid knowledge of containerization with Docker, and experience running workloads on Kubernetes; Web and application servers: Apache, Nginx, Tomcat; Messaging and streaming: Kafka, ActiveMQ; Data stores: Redis, MongoDB, Couchbase; Search and logging: Elasticsearch; Experience with monitoring and observability tools (Icinga, Prometheus, Grafana, ELK); Familiarity with CI/CD pipelines and infrastructure-as-code; Good understanding of networking fundamentals (TCP/IP, DNS, VLANs, routing, firewalls); Experience designing, deploying, and maintaining high-availability setups; Knowledge of load balancing technologies, including BGP-based load balancing; Ability to diagnose and resolve complex issues across the stack, from OS to network to application; Good written and spoken English; clear documentation habits.

Must have: Availability to participate in an on-call rotation What we offer: Access to local/international trainings, development and growth opportunities, including access to e-learning platforms, covering both technical and soft skills areas; Modern technologies, product responsibility; Flexible work schedule; Hybrid work option; Medical services package from one of two private providers; 25 vacation days per year; Substitute days off for public holidays that occur on the weekend; Meal tickets; Internal referral program; Team events, networking events organized to promote a passionate, creative and diverse culture; Summerfest and Winterfest parties; Of course, coffee, soft drinks and fresh fruits are on us in the office.

We are looking forward to meeting you! 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.

Source listing: greenhouse_ionos2

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