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GMX, WEB.DE & mail.com Tech Stack

Email and communications platform serving 43M+ users across Germany, Austria, Switzerland

Technology, Information and Internet Karlsruhe, Baden-Württemberg 501–1,000 employees Public Company

GMX, WEB.DE, and mail.com operate a consumer email and communications platform at scale, serving over 43 million active users across the DACH region. The tech stack—Python, PySpark, Trino, Kubernetes, Dagster, and infrastructure-as-code tools (Terraform, Ansible)—reveals an engineering organization focused on data pipeline reliability and cloud-native infrastructure. Active projects center on private Kubernetes platforms, virtualization (Harvester-based), datacenter network automation, and security-critical process design, with current pain points clustered around 24/7 operational continuity and scaling infrastructure for millions of concurrent users.

Tech Stack 60 technologies

Core StackPython PySpark Trino NumPy GitLab Dagster Kubernetes Grafana Prometheus Java Ansible Terraform Loki VMware Helm Puppet Linux ArgoCD Git KVM KubeVirt Ceph ZFS Longhorn QEMU Proxmox Bash HAProxy Envoy GitLab Runner+29 more

AdoptingKubernetes Istio SIEM

What GMX, WEB.DE & mail.com Is Building

◆Challenges

Ensuring 24/7 operational continuity
Scaling infrastructure for millions of users
Leading change and transformation processes
Optimizing hr processes
Performance challenges
Scalable clusters
Account hijacking attacks
Scaling datacenter network for millions of users
Operating high-throughput infrastructure at scale
Automating network operations

▲Active Projects

Harvester- and kubernetes-based virtualization platform design and operation
Private kubernetes cloud platform
Next-generation datacenter network systems
Automation of network operations
Kubernetes operators development
Filter pipelines for event metrics
Design and optimization of security-critical processes
Distributed storage integration and compute resource management
Automation of provisioning, lifecycle, troubleshooting, and monitoring
Loadbalancer platform evolution

Hiring Activity

Accelerating30 roles · 20 in 30d

Department

Engineering

14

Design

3

Ops

3

Security

3

Data

2

HR

2

Marketing

1

Seniority

Mid

11

Senior

7

Intern

6

Lead

2

VP

2

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About GMX, WEB.DE & mail.com

GMX, WEB.DE, and mail.com are the leading email and communications providers in Germany, Austria, and Switzerland, collectively serving over 43 million active users. The company operates from Karlsruhe, Germany, and has 501–1,000 employees. Beyond email, the portfolio includes office tools, cloud solutions, and identity management services. Infrastructure is managed in-house via private Kubernetes clusters and virtualized compute platforms, with a tech foundation in Python, Spark, and Kubernetes-native tools. The organization is currently hiring across engineering (the largest cohort), design, operations, security, and data teams, with roles concentrated in Germany.

HeadquartersKarlsruhe, Baden-Württemberg

Company Size501–1,000 employees

Hiring MarketsGermany

Frequently Asked Questions

What tech stack does GMX use?

Primary stack: Python, PySpark, Trino, Kubernetes, Dagster, GitLab, Prometheus, Grafana, Terraform, Ansible. Infrastructure layer: KVM, KubeVirt, Ceph, ZFS, Proxmox, HAProxy, Envoy. Currently adopting SIEM, Istio, and expanding Kubernetes.