Senior Infrastructure Engineer

📋 Job Overview

Welcome to Hack The Box! We're on a mission to raise cyber resilience so that every organization can stay ahead of tomorrow’s threats. As an 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.

🏢 About Hack The Box

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.

🎯 The Role

As an 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.

✅ Key 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

📌 Required Qualifications

• 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

⭐ Desirable Experience

• 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

🎁 Benefits

• 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

🛂 Visa & Eligibility

Relocation support is available for candidates relocating to Greece, including a 10% relocation bonus on the annual salary and a 50% tax reduction on income. Candidates located within 55 km of our Athens office will follow a hybrid work model, while those beyond that radius can work fully remotely.