Virtualization Engineer

Plenit España; Madrid; On-site; EUR 60,000 - 90,000; Full time

Job summary

Plenit España is seeking a Virtualization Engineer to design, deploy, and operate KVM-based infrastructure in production. You will shape the virtualization layer, influence architecture decisions, and drive reliability across the platform.

Working with Network, Systems, Storage, and Operations, you will resolve high-impact incidents, optimize performance, and push for automation to reduce manual tasks.

Qualifications

• Experience in administration and support of virtualization environments based on KVM in production.
• Proven experience in implementation, operation and troubleshooting of virtualization platforms.
• Advanced knowledge of Linux system administration.
• Strong understanding of KVM virtualization stack, including QEMU and libvirt.
• Experience diagnosing complex issues related to performance, capacity, availability and stability.
• Practical knowledge of networking in virtualized environments: bonding, VLANs or VXLANs, firewall rules (iptables).

Responsibilities

• Design, deploy, operate and evolve virtualization infrastructures based on KVM in production environments.
• Contribute to architecture decisions and help improve infrastructure-related products.
• Resolve critical incidents and analyze high-impact escalations from the operations team.
• Optimize performance, stability and efficiency of the virtualization platform.
• Contribute to automation to reduce manual and repetitive tasks.
• Collaborate with Network, Systems, Storage and Operations to solve cross-functional issues.

Skills

KVM

Linux

QEMU

libvirt

Networking (KVM)

Performance troubleshooting

Root-cause analysis

Automation (Ansible)

Tools

OpenStack

CloudStack

Ceph

NFS

iSCSI

Ansible

Job description

Plenit (formerly Jotelulu) is the Operating Platform for IT Service Providers. We help MSPs, ISVs, VARs, and IT resellers run, scale, and grow their businesses on top of our own sovereign infrastructure, with footprint across Europe and the Americas.

We are a European cloud platform with a clear conviction: digital sovereignty matters, and the IT channel deserves a partner that speaks their language, builds for their reality, and stays close to the ground. We are not enterprise-y. We are simple, pragmatic, and obsessed with our partners’ success.

Five years in, we are 130 people, four countries, and growing fast — which is exactly why we are bringing this role on now.

We’re passionate about technology, but we’re also a bit geeky—we love Star Wars, video games, 90s movies, and pop culture. We work hard and with passion, but we also have a great time together. At Plenit, you’ll find a balance between work and fun, where teammates often become friends, and boredom is rare—there’s always something new, unexpected, and memorable happening.

The challenge

We're at a pivotal stage in the evolution of our cloud platform. To continue scaling efficiently and strengthening reliability, we are evolving our virtualization platform within our IaaS environment. Our infrastructure supports mission-critical services, where performance, stability and continuous improvement are key.

As a Virtualization Engineer, your mission will be to design, deploy, operate and evolve virtualization infrastructures based on KVM in production environments. You will contribute directly to the evolution of the virtualization layer, participate in architecture decisions, and help improve infrastructure-related products.

You will play a key role in resolving critical incidents, analyzing high-impact escalations from the operations team, and optimizing performance, stability and efficiency of the platform. You will also contribute to reducing operational friction through automation and continuous improvement.

You'll be part of a highly collaborative engineering environment, working closely with Network, Systems, Storage and Operations teams to solve cross-functional issues and ensure the platform evolves in a scalable and reliable way.

Collaboration will be essential. You will support infrastructure decisions, participate in architecture changes, migrations and capacity expansions, proactively identify improvements, and ensure the platform continues to evolve with a strong technical foundation.

Requirements that are important for us

• Experience in administration and support of virtualization environments based on KVM in production.
• Proven experience in implementation, operation and troubleshooting of virtualization platforms.
• Advanced knowledge of Linux system administration.
• Strong understanding of KVM virtualization stack, including QEMU and libvirt.
• Experience diagnosing complex issues related to performance, capacity, availability and stability.
• Practical knowledge of networking in virtualized environments: bonding (link aggregation), VLANs or VXLANs, firewall rules (iptables).

Key skills and expected impact

• Strong documentation practices and contribution to technical procedures and operational best practices.
• Optimization of performance, stability and efficiency of the virtualization platform.
• Ability to lead root cause analysis and propose technical improvements to reduce incident recurrence.
• Resolution of complex and critical incidents escalated by the operations team.
• Contribution to automation to reduce manual and repetitive operational tasks.
• Technical judgment in validating new solutions, designs and changes impacting the virtualization layer.
• Acting as a technical reference, contributing to raising the overall technical level with practical knowledge and global vision.

Nice to have

• Experience with infrastructure orchestration platforms such as OpenStack, CloudStack or similar.
• Experience in cloud providers, IaaS platforms or large-scale infrastructure environments.
• Knowledge of centralized storage (NFS, iSCSI) and distributed storage (Ceph).
• Experience in high availability, capacity planning and resource optimization.
• Familiarity with observability, monitoring and performance analysis tools.
• Experience with automation tools such as Ansible.
• Participation in architecture evolution, standardization or platform improvement projects.
• Ability to document technical decisions and communicate clearly in multidisciplinary environments.

Tools

• Networking: bonding, VLANs, VXLANs, iptables
• Storage: NFS, iSCSI, Ceph
• Orchestration: OpenStack, CloudStack or similar
• Automation: Ansible or similar
• Observability & performance: monitoring and performance analysis tools
• Collaboration & documentation: technical procedures and operational documentation