Senior Site Reliability Engineer (f/m/d)

Kubermatic GmbH

Poland

Remote

PLN 286,000 - 485,000

Full time

3 days ago

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Benefits offered by this job

Remote-first

Competitive salary

B2B contracts with paid time off

Training & certifications

Conference attendance

ContainerDays community events

Hackathons

Job summary

Kubermatic GmbH is seeking an experienced Site Reliability Engineer focused on Kubernetes to ensure reliability, availability, and performance of cloud-native infrastructure. You will collaborate with engineering and delivery teams to design, build, and operate infrastructure across AWS, GCP, Azure, and on-prem environments.

You will automate tasks, implement best practices for monitoring and incident response, and contribute to open-source initiatives while staying current with Kubernetes and

Qualifications

6+ years of professional experience in SRE/DevOps or similar infrastructure roles.
Deep understanding of Kubernetes internals (API server, etcd, kubelet, CSI, CNI, CRI).
Strong experience with two+ major cloud providers (AWS, GCP, Azure).
Production experience with infrastructure as code using Terraform and Helm.
Solid Linux sysadmin skills (networking, storage, systemd, debugging).
Ability to read Go and work with controller-runtime traces and small tools.
Experience maintaining CI/CD infrastructure (Prow, GitHub Actions).
Experience with secrets management (Vault) and PKI/TLS operations.
Experience building observability stacks (Prometheus, Grafana, Loki).

Responsibilities

Design, build, and maintain reliable Kubernetes-based infrastructure.
Operate production KKP seed and master clusters across cloud providers; plan upgrades and migrations.
Provision QA, staging, and demo environments aligned with release candidates.
Manage credential lifecycles and certs across multi-tenant environments.
Develop automation tools to streamline provisioning and operations workflows.
Monitor health and performance; improve reliability, scalability and efficiency.
Maintain observability with MLA stack and issue detection before customers notice.
Support KubeVirt operations, including VM provisioning and networking between seeds and workloads.
Write Infrastructure as Code with Terraform and Helm; manage state and drift detection.
Collaborate with teams to reduce recurring problems and prevent incidents.

Skills

Kubernetes internals

Multi-cloud

Linux administration

CI/CD tooling

Secrets management

Observability stack

Go reading ability

Tools

Terraform

Helm

Vault

External Secrets Operator

Prow

GitHub Actions

Prometheus

Grafana

Loki

cert-manager

Job description

Location: Europe (Time zone: CET ± 4h) or on-site/hybrid in Hamburg, Germany. We are a remote-first company.

About Us

At Kubermatic, we believe that businesses should focus on their core purpose: writing groundbreaking applications, not operations. In line with our commitment to make Kubernetes as easy as possible, we help IT teams worldwide to fully automate their Kubernetes and cloud native operations across multi-cloud, edge, and on-prem.

As one of the top corporate contributors to the Kubernetes project, we develop enterprise-grade software solutions and provide professional services and support to safely navigate and accelerate your cloud native transformation. Our open-source Kubermatic Kubernetes Platform makes it easy to operate thousands of Kubernetes clusters on any infrastructure.

Role Summary

As a Site Reliability Engineer (SRE) with a focus on Kubernetes, you'll help ensure the reliability, availability, performance, and security of Kubernetes-based infrastructure and cloud-native applications. You'll work closely with our engineering and customer delivery teams to build, operate, and continuously improve infrastructure and services across different environments.

Your work will involve troubleshooting complex issues, automating operational tasks, and implementing best practices for monitoring, incident response, and system reliability. You'll help us build resilient infrastructure, improve operational efficiency, and deliver a dependable experience for our customers.

We're looking for someone who enjoys solving challenging infrastructure problems, takes ownership of reliability, and is passionate about Kubernetes, Linux, and automation.

What Will You Be Doing?

Collaborate with engineering and customer delivery teams to design, build, and maintain reliable Kubernetes-based infrastructure.
Operate and maintain production KKP seed and master clusters across AWS, GCP, Azure, vSphere, and Hetzner, including version upgrades, migration planning, and rollback procedures
Provision and manage QA, staging, and demo environments for product teams, ensuring they stay current with release candidates and upgrade paths
Perform credential and certificate lifecycle management across multi-tenant environments, including rotating cloud provider secrets (Azure, AWS, vSphere), managing Vault policies, and operating cert-manager with Let's Encrypt
Develop and maintain automation tools and scripts to streamline infrastructure provisioning, configuration, and operational workflows.
Monitor system health and performance, analyse trends, and identify opportunities to improve reliability, scalability, and efficiency.
Implement and maintain best practices for observability, alerting, incident response, and service reliability.
Support KubeVirt operations, including virtual machine provisioning, operator lifecycle, cert rotation for KubeVirt and CDI components, and network connectivity between seed clusters and KubeVirt workloads
Write and maintain Infrastructure as Code using Terraform and Helm, manage Terraform state across customer environments, and detect and resolve configuration drift
Collaborate with engineering teams to identify recurring problems, improve operational processes, and prevent incidents from happening again.
Build and maintain observability with Prometheus, Grafana, and the KKP Monitoring, Logging, and Alerting (MLA) stack so that issues surface before customers notice them.
Stay up to date with developments in Kubernetes, Linux, cloud-native technologies, and the broader open-source ecosystem.
Support engineering and product teams by investigating customer-reported issues, tracing problems through the KKP codebase, and providing technically grounded responses
Contribute to open-source projects and upstream initiatives where appropriate.

What You Should Bring

6+ years of Professional experience as a Site Reliability Engineer, DevOps Engineer, Platform Engineer, Systems Engineer, or in a similar infrastructure-focused role.
Deep understanding of Kubernetes internals, including the API server, etcd, kubelet, CSI, CNI, CRI, admission webhooks, and certificate management
Strong experience with at least two major cloud providers (AWS, GCP, Azure) and their managed services
Production experience with Infrastructure as Code using Terraform and Helm
Solid Linux systems administration covering networking, storage, systemd, and debugging with tools like strace, tcpdump, and iptables
Comfort reading and writing Go. You do not need to be a Go developer, but you should be able to read controller-runtime reconcilers, trace code paths, and write small tools
Experience maintaining and improving CI/CD infrastructure. Our pipelines run on Prow and GitHub Actions across all Kubermatic products, so you should be comfortable owning that kind of system end to end
Experience with secrets management (Vault, External Secrets Operator) and PKI/TLS operations
Experience building and maintaining observability stacks, including monitoring, logging, and alerting with tools such as Prometheus, Grafana, and Loki

Nice to have

Experience with bare-metal Kubernetes, including PXE boot, IPAM, and hardware lifecycle management
Familiarity with KubeVirt and running virtual machines on Kubernetes
Experience with Ceph or other distributed storage systems
Familiarity with network overlays such as Cilium, Calico, or Kube-OVN
Contributions to CNCF or open-source Kubernetes projects

What We Offer

Competitive salary.
B2B contracts available, with paid time off annually plus local bank holidays.
Remote-first: work from anywhere in Europe (CET ± 4h).
A dynamic yet laid-back team environment.
Regular hackathons and company offsites.
Best-in-class development tools of your choice.
Full support for training and certifications (CKA, Linux Foundation, etc.) and conference attendance.
Speaker support: we'll back you if you want to present at events.
Active community involvement: enjoy our meetups and our flagship community conference, ContainerDays.