Nearshore: Senior Software Engineer — KVM Virtualization (Cloud Hypervisor/QEMU/Libvirt) + Gardenlinux + Gardener (Kubernetes)

We are seeking Senior Software Engineers with strong Linux OS, KVM virtualization, and Gardener Kubernetes expertise to provide expert-level support and consulting. You will troubleshoot complex production issues, optimize performance, harden systems, and strengthen integration across Gardenlinux, KVM-based virtualization (Cloud Hypervisor/QEMU/Libvirt), and Gardener-managed Kubernetes clusters.

1) Gardenlinux (Debian-based OS)

- Configure, deploy, and maintain Gardenlinux-based environments

- Troubleshoot OS-level issues (kernel, boot, packages, system services)

- Debug custom image builds and runtime behavior

- Provide recommendations for performance tuning and security hardening

2) KVM Virtualization Stack (Cloud Hypervisor, QEMU, Libvirt)

- Configure and integrate KVM-based virtualization environments

- Optimize performance across compute, networking, and storage

- Debug and tune Cloud Hypervisor and Libvirt configurations

3) Gardener Kubernetes Platform

- Troubleshoot incidents in Gardener control plane and shoot clusters

- Perform root cause analysis for provisioning, scaling, and upgrade failures

- Support integration between Gardener, Gardenlinux, and KVM-based nodes

Required Skills & Experience

- Strong hands-on expertise with Debian-based Linux

- Kernel configuration and low-level troubleshooting (boot/perf/kernel)

- Experience with OS image customization and build pipelines

- Strong knowledge of systemd, package management, and OS hardening

- Familiarity integrating OS image build/deployment into CI/CD

- Advanced understanding of KVM, QEMU, and Libvirt architectures

- Hardware virtualization fundamentals, including NUMA alignment

- Automation/scripting skills in Go, Python, and/or Bash

- Host performance tuning and low-level debugging experience

- Strong Kubernetes internals knowledge (control plane, networking, scheduling)

- Hands-on experience with Gardener (seed/shoot operations and troubleshooting)

- Cluster lifecycle management: upgrades, node troubleshooting, scaling

- Observability proficiency: Prometheus (and ideally Perses)

- Ability to lead/author incident RCA and contribute to post-mortems