System Engineer - Infrastructure

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.

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.

Lived corporate culture: Flat hierarchies, a culture of respect and appreciation, signatories of the Diversity Charter, open communication and no dress code

Wide range of further training: Internal and external training opportunities, LinkedIn Learning, language courses, talent development programs, conferences and mentoring

TEC-Campus: Free choice between Linux, Mac, or Windows, slack days, conferences, lecture series, courses, open-source projects, community meetups and user groups

Active health care: Wellpass, free internal sports and fitness classes, health days, family & care support services, discounts at fitness centers, mental health first responder, fresh fruit and drinks for free

Mobility: Subsidy for job bike leasing, job ticket and relocation service if you live outside Germany

Flexible working models: Home office options, flexible working hours and 30 days of vacation with the option for additional unpaid leave

Financial benefits: Corporate benefits, company pension scheme, capital-forming benefits, occupational disability insurance and various partner discounts

Events: Summer and winter parties, sports tournaments and team events

With our strong brands GMX, WEB.DE and mail.com and over 42 million active users, we are the leading email and communications platform in Germany, Austria and Switzerland. From this strong market position, services and apps are developed that simplify users' digital lives - from office tools and cloud solutions to personal ID management.