Senior Infrastructure Engineer

Palaio Faliro, Attica, Greece

Ready to embark on the quest of joining Hack The Box?

Welcome! Super excited you dropped by 🥳

At the end of this journey, you'll become a proud member of Hack The Box, with the ultimate mission to raise cyber resilience, so that every organization can stay ahead of tomorrow’s threats.🚀🔒💻

About the Position

As a Senior Infrastructure Engineer, you will build, maintain, and evolve the compute, storage, and container platforms that power Hack The Box across data centers in the US, EU, Singapore, and Australia. You'll work at the intersection of bare-metal infrastructure, virtualization, and cloud-native tooling - and play a key role in one of HTB's most impactful infrastructure initiatives: the migration away from VMware toward an open-source virtualization and cloud platform.

Core mission: Operate and improve HTB's virtualization and storage stack (VMware vSphere, Ceph, Kubernetes) while helping the team evaluate, plan, and execute a migration to an open-source alternative.

Responsibilities

• Operate and maintain VMware vSphere clusters and NSX-based virtual networking across multiple data center sites.
• Administer and tune Ceph storage clusters, including NVMEoF-backed pools and RBD volumes.
• Deploy, upgrade, and troubleshoot Kubernetes clusters running on bare-metal and virtualized infrastructure.
• Contribute to the evaluation and proof-of-concept work for migrating from VMware to an open-source platform.
• Develop and maintain infrastructure-as-code (Ansible playbooks, Terraform modules) for repeatable, auditable deployments.
• Monitor infrastructure health and performance using Prometheus, Grafana, and alerting pipelines; respond to incidents.
• Collaborate with the network engineering team on data center connectivity, VLAN/VRF provisioning, and storage-network performance.
• Support hardware lifecycle operations: racking, provisioning, firmware updates, and decommissioning across regions.
• Write and maintain technical documentation, runbooks, and post-incident reviews.
• Participate in on-call rotation for infrastructure-related incidents.

Requirements

• 3–5 years of professional experience in infrastructure, systems, or platform engineering.
• Hands-on experience with VMware vSphere administration (cluster management, resource pools, vMotion, HA/DRS).
• Working knowledge of VMware NSX or similar software-defined networking.
• Experience administering Ceph storage (or comparable distributed storage systems).
• Solid Kubernetes operations experience (deployment, upgrades, troubleshooting, cluster lifecycle).
• Strong Linux systems administration skills (Debian).
• Familiarity with infrastructure-as-code tools (Ansible, Terraform).
• Comfortable working with monitoring and observability stacks (Prometheus, Grafana).
• Good written communication skills for documentation and remote-first collaboration.
• Being cyber security-minded is a strong plus.

Nice to Have

• Hands-on experience with OpenStack, CloudStack, or similar.
• Experience with Ceph NVMEoF transport or RDMA-based storage networking.
• Understanding of Golang for writing internal automation or tooling.
• Familiarity with BGP, EVPN-VXLAN, or data center networking concepts.
• Experience with bare-metal provisioning tools (Tinkerbell).
• Previous work in a multi-region data center environment.

We Offer

• 25 annual leave days.
• Paid parental leave.
• Home Office Allowance.
• Dedicated budget for training and professional development, participation in conferences.
• State-of-the-art equipment.
• Full access to the Hack The Box lab offerings; so you can learn how to hack 😉.
• Flexibility in working hours.

About the Company

Hack The Box is the leading cyber readiness platform for the agentic era, battle-testing and upskilling both humans and AI agents to enhance organizational cyber resilience. Trusted by the Fortune 500, government agencies, and MSSPs, the platform delivers threat-informed learning paths consisting of real-world scenarios in gamified labs and live-fire simulations that build and validate offensive and defensive cyber capabilities. With a loyal community of more than 4 million members and 800+ enterprise customers, Hack The Box empowers teams and intelligent systems alike to strengthen cyber defenses and reduce breach risk effectively.

Rapidly growing its international footprint and reach, Hack The Box is headquartered in the UK, with additional offices in the US, Australia, and Greece.

🚨 News & Resources:

• We’re incredibly proud to share that our headquarters in the UK, along with our entities in Greece and the US, have been certified as a Great Place to Work for 4 consecutive years (2023 - 2026).
• In addition, our Greek entity has been recognized among the Best Workplaces in Greece (4th, 2nd, 3rd, 1st) and Europe (7th, 10th, 73rd) during this period - a testament to our strong culture and commitment to creating an exceptional employee experience!

Take a sneak peek at how it is to be part of HTB. Get more insights about our HTB culture and employee experience by visiting the “about us” section of our site, our career site, and Glassdoor.

At Hack The Box, we are committed to fostering a diverse, inclusive, and equitable workplace. We believe that diversity enriches our performance, services, and the communities we serve. As such, we ensure that all job applications are considered solely based on merit, skills, and qualifications. We do not discriminate on grounds of race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. We are dedicated to providing a fair and respectful work environment that reflects our values.

Hack Your Career, Today. Join us in this epic adventure of cybersecurity at Hack The Box! 🚀🔒💻