System Engineer – Linux Infrastructure & Network (f/m/d)
GMX, WEB.DE & mail.com | IT System Administration / Network Administration | Karlsruhe / Munich | Permanent | Full-time | Experienced professionals | Reference ID: 310
- Your tasks
Are you ready to take ownership of a global Loadbalancer platform serving millions of users? As a System Engineer, you’ll architect, secure, and operate high-throughput infrastructure based on HAProxy and Envoy, all within a GitOps-driven environment. You’ll collaborate across teams and act as a technical advisor—your work will directly influence the reliability and efficiency of our production systems.
We operate at serious scale: 3.5 billion logins per day, hundreds of petabytes of storage, and nearly half an exabyte of internet traffic annually. Join a team that’s building a European alternative to email and cloud services, committed to privacy, digital sovereignty, and operating under European law.
- You own the design, operation, and continuous evolution of our Loadbalancer platform.
- You define rollout strategies such as Canary Routing and Blue/Green deployments, and implement them via GitOps pipelines.
- You monitor and optimize key metrics like request rates, response times, and error rates.
- You establish and enforce security policies for TLS, SNI, header handling, rate limiting, and circuit breakers.
- You present architectural concepts and platform strategies to internal and external stakeholders.
Our benefits
Lived corporate culture
Transparency, open communication and short decision-making processes
Wide range of further training
E-learning, seminars, conferences and mentoring
Renowned TEC-Campus
Conferences, lecture series, courses, open source projects, community meetings, user groups
Active health care
Sports and fitness classes, lectures, discounts at fitness and health centers, fresh fruit and drinks for free
Mobility
Generous subsidy for job bike leasing and the job ticket
Flexible working models
Home office, mobile office, flexible working hours, trust-based working time arrangements
Financial benefits
Company pension scheme, discounts on our products and various leisure activities
Legendary events
Summer and winter parties, additional workshops and team events
- Your profile
Do you have a degree in Computer Science or equivalent experience? Are you confident in designing and operating platforms in large-scale environments? Do you thrive in cross-functional collaboration and technical leadership? We believe the following skills and experiences will help you to be successful in this role:
- 5+ years of experience in designing and operating infrastructure at scale.
- Expertise in HAProxy and/or Envoy, including advanced configuration (ACLs, TLS termination, routing strategies).
- Strong proficiency in GitOps tools (e.g., ArgoCD, GitLab Runners), CI/CD pipelines, and secret management (e.g., Vault), as well as Debian packaging.
- Programming experience in Lua, WASM, Python, or Bash, along with strong debugging skills using logs, Prometheus metrics, and tracing tools.
- Excellent communication skills in English, with the ability to advise stakeholders and lead cross-functional initiatives.
- Our benefits in detail
- Our corporate culture: No dress code, flat hierarchies, open and transparent communication.
- Individual development opportunities: diverse training courses, e-learning and internal communities, language courses, mentoring.
- Events: Slack Days, open source projects, meet-ups.
- Relocation service: support with relocation to Germany.
- Benefits and additional services: company pension scheme, capital-forming benefits, discounts on own products, job ticket, bike leasing, corporate benefits portal.
- Attractive working conditions: 30 days of holiday, hybrid working, full-time and part-time arrangements, free choice between Linux, Mac, or Windows.
- Social: team events, summer and winter parties, family and care service, sports and fitness programmes, subsidised canteen, free fruit and drinks, health courses.
- Topics that are also important to us: Sustainability, diversity, and our values and leadership principles - find out more on our website mail-and-media.com.
We are brand. With GMX, WEB.DE and mail.com and over 42 million active users, we are the leading email and communication platform in Germany, Austria and Switzerland.
We are future. Our services and apps simplify digital life from cloud storage to news and ID management.
You are at home. Your digital passion finds a professional home with us. Your strength makes us stronger, your expertise complements our ideas, your success becomes visible. Together we shape the digital future.
Diversity enriches. Different cultures, nationalities, genders, age groups, sexual orientations and religions as well as people with disabilities - we desire diversity and encourage it. Because only teams that reflect all facets of society offer the best framework conditions for creativity and make a company productive and distinctive. We value diversity and welcome all applications.
Apply now
We look forward to receiving your application, including your salary expectations and the reference number given above. Please use our online application form. If you have any questions about the position or the application process, please send us an email.
1&1 Mail & Media Applications SE
Recruiting & Candidate Management
Brauerstraße 48
D-76135 Karlsruhe
We are awarded!
